JPH09127177A - Identification method and device for object to be identified - Google Patents

Abstract

PROBLEM TO BE SOLVED: To jointly use two identification methods, a voltage detection system and a current detection system so as to cover mutual defects and detect a target object to be identified. SOLUTION: In the case of identifying a specified cable A among plural conductive cables, it is judged whether the receive end of the specified cable is the open state or the earth state by an overload judging circuit 20. In the case of the open state, a voltage detecting system is used to detect a voltage signal applied from the voltage applying part 11 to the cable conductor A2 of the specified cable by a voltage detecting part 30, thereby identifying a cable, and in the case of the earth state, a current detecting system is used to detect a current signal fed from a current feeding part 16 to the cable conductor A2 by a current detecting part 51, thereby identifying a cable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductive object to be identified, for example, an object to be identified which identifies a predetermined cable from a plurality of cables housed in a protective tube such as a rail trough or a duct. The present invention relates to an identification method and its device.

[0002]

Related Background Art Normally, a plurality of cables are laid inside a protective tube. Some of these cables may become unusable due to the deterioration of their service life due to aging or failure. When removing an unnecessary cable in this way, an operator accidentally cuts the cable in use, and a highly reliable cable identification device has been desired.

Therefore, conventionally, there is an identification device using a frequency identification (current identification) method. In this identification device,
A plurality of frequency signals are supplied from the transmitter side to the cable conductor to be identified, and the electromagnetic induction type sensor part of the receiver set in the middle part of the cable group detects the current signal in the cable. The output signal from the sensor is passed through a filter that passes a plurality of supply signal frequencies from the transmitter, and when all the supply signal components are output, the cable is determined to be the target cable.

There is also an identification device using a capacitance (voltage identification) method. In this identification device, an operator puts the detection head of the receiver on the surface of the cable to detect the metal conductor inside the cable and the detection conductor. A ground return circuit is formed by the electrostatic coupling between the signal electrodes and the electrostatic coupling between the operator's body and the ground. The receiver detects the voltage signal applied to the identification target cable and identifies whether the cable to which the detection head is applied is a target cable based on a plurality of discrimination criteria.

[0005]

However, in the current discriminating method, since the AC signal is supplied to the cable, the signal frequency component from the transmitter is also induced in the adjacent cable by the electromagnetic induction. Therefore, in the identification device, there is a possibility that a cable that does not supply a signal may be erroneously determined as a target cable. Therefore, it is possible to compare the level of the signal detected on the receiver side for all cables.However, even if the cable that supplied the signal is branched in the middle, and even if the intended cable is not on the receiver side, However, there is a problem that the highest detection level is mistakenly determined as the target cable.

Further, in the voltage identification method, since the electrostatic coupling between the metal conductor inside the cable and the detection signal electrode of the receiver is utilized, the surface condition of the cable (eg, a water film adheres to the surface of the cable). However, there is a problem in that the capacity may change depending on the condition (such as the state in which the battery is in use), which may cause a wrong judgment.
Further, when the receiving end of the cable is grounded, the impedance between the cable and the ground becomes small, so the connection to the ground must be disconnected.

The present invention has been made in view of the above problems, and uses two identification methods of a voltage identification method and a current identification method in combination to compensate for each other's defects and accurately detect a target object to be identified. It is an object of the present invention to provide a possible identification method and an apparatus thereof.

[0008]

In order to achieve the above object, the present invention provides a method for identifying an object to be identified, which identifies a predetermined cable from a plurality of electrically conductive cables.
An applying step of generating a voltage signal having a predetermined frequency oscillated from the first oscillating unit and directly applying the voltage signal to the predetermined cable, and detecting the voltage signal by an electrostatic coupling method, A constant frequency constant current signal is generated based on a voltage identification method including a first identification step of identifying a predetermined cable and a constant frequency signal oscillated from a second oscillating unit, and the constant frequency constant current signal is generated. A current identification method comprising a supply step of directly supplying the predetermined cable to the predetermined cable, and an identification step of detecting a current signal supplied to the predetermined cable by an electromagnetic induction method and identifying a predetermined object to be identified from the detection result. And determining the grounding condition of the receiving end side of the predetermined cable according to the change in impedance between the predetermined cable and ground, and based on the determination result, the voltage identification method or Identification methods have been provided for the current detection method to be the identification object using, in combination with voltage detection method and a current detection method to complement each other's shortcomings and limitations.

In the second and third aspects, the grounding condition of the receiving end side of the predetermined cable is sequentially changed, and the grounding condition of the receiving end side of the predetermined cable is determined according to the change in impedance between the predetermined cable and the ground. Then, based on the determination result, the voltage identification method or the current identification method is sequentially switched and used, whereby different identification methods are automatically switched and used together to identify the predetermined cable.

According to a fourth aspect of the present invention, in a method of identifying an object to be identified, which identifies a predetermined cable from a plurality of electrically conductive cables having a plurality of core wires therein, a predetermined oscillator oscillated by the first oscillating unit. An applying step of generating a voltage signal having a frequency and directly applying the voltage signal to a core wire other than a predetermined core wire of the predetermined cable; and detecting the voltage signal by an electrostatic coupling method, A voltage identification method comprising a first identification step for identifying a predetermined cable;
The constant current control unit generates a constant frequency constant current signal based on the constant frequency signal oscillated from the oscillating unit, and the constant frequency constant current signal is directly applied to at least one predetermined core wire of the predetermined cable. And a current identifying method including a supplying step and a second identifying step of detecting a current signal supplied to the predetermined cable by an electromagnetic induction method and identifying the predetermined cable from the detection result. When identifying a cable, the voltage identification method and the current identification method are used at the same time, and in the applying step and the supplying step, the voltage signal and the constant frequency constant current signal are simultaneously output to each core wire, and a predetermined core By grounding only the receiving end of the wire, two types of signal levels are checked at the same time, and the specified cable is comprehensively identified.

In the fifth and sixth aspects, when the predetermined cable has a shield layer, the voltage signal is directly applied to a core wire other than the predetermined core wire of the predetermined cable or the shield layer in the supplying step. The signal level can be checked also by the shield layer by grounding only the receiving end side end of the predetermined core wire. In claim 7 and 10, in the identification device of the identification object for identifying the predetermined cable from the plurality of conductive cables, a voltage signal having a predetermined frequency oscillated from the first oscillating unit is generated,
A constant-frequency constant-current signal is generated based on a constant-frequency signal oscillated from the second oscillating unit and a voltage-discrimination type applying unit that directly applies the voltage signal to the predetermined cable, and the constant-frequency constant current is generated. A current-identification type supply unit that directly supplies a signal to the predetermined cable, a determination unit that determines the grounding status of the receiving end side of the predetermined cable, and a signal from the application unit or the supply unit is switched to the predetermined cable. A transmitting unit having a switching unit for outputting, a first identifying unit for detecting a voltage signal applied to the predetermined cable by an electrostatic coupling method, and identifying the predetermined cable from the detection result, and an electromagnetic induction method. A receiving unit having a second identifying unit that detects a current signal supplied to the predetermined cable and identifies the predetermined cable from the detection result, and the receiving unit of the predetermined cable in the determining unit. The ground situation determined in accordance with a change in the impedance between the predetermined cable and ground, based on 該判 Results by, complement each other's shortcomings and constraints using the voltage detection method or the current detection method.

According to the present invention, the changing means for sequentially changing the grounding condition on the receiving end side of the predetermined cable and the voltage signal having the predetermined frequency oscillated from the first oscillating section are generated.
A constant-frequency constant-current signal is generated based on a constant-frequency signal oscillated from the second oscillating unit and a voltage-discrimination type applying unit that directly applies the voltage signal to the predetermined cable, and the constant-frequency constant current is generated. A current-identification-type supply unit that directly supplies a signal to the predetermined cable, and a determination unit that determines the grounding condition of the receiving end side of the predetermined cable that is sequentially changed according to the change in impedance between the predetermined cable and the ground. Detecting a voltage signal applied to the predetermined cable by a capacitive coupling method and a transmission unit having a switching unit that sequentially switches the signal from the application unit or the supply unit and outputs the signal to the predetermined cable according to the determination result. A first discriminating unit for discriminating the predetermined cable from the detection result and a current signal supplied to the predetermined cable by an electromagnetic induction method, and detecting a predetermined case from the detection result. And a receiving means and a second identifying unit for identifying the table, in combination automatically switches different detection method.

According to the ninth and the twelfth aspects of the present invention, in the identification device of the object to be identified for identifying a predetermined cable from a plurality of electrically conductive cables having a plurality of core wires therein, the predetermined oscillation oscillated by the first oscillating unit. Generate a voltage signal consisting of frequency,
A constant frequency constant current based on the constant frequency signal oscillated from the voltage oscillating type applying section for directly applying the voltage signal to the core wires other than the predetermined core wire of the predetermined cable. A current-identification-type supply unit that generates a signal and directly supplies the constant-frequency constant-current signal to at least one predetermined core of the predetermined cable, and a determination unit that determines the grounding condition of the identification side of the predetermined cable. And a transmitting means for simultaneously outputting the voltage signal and the constant frequency constant current signal to the corresponding core wires when the predetermined cable is identified, and the electrostatic coupling. Detecting a voltage signal applied to the predetermined cable by a method, detecting a first identification unit for identifying the predetermined cable from the detection result, and detecting a current signal supplied to the predetermined cable by an electromagnetic induction method, detection The identifying a predetermined cable from fruits 2
And a receiving means having an identifying section, and by connecting only the receiving end side end of the predetermined core wire to the ground, two types of signal levels are checked at the same time.

In the eleventh and twelfth aspects, when the predetermined cable has a shield layer, the supply unit directly applies the voltage signal to a core wire other than the predetermined core wire of the predetermined cable or the shield layer. , The signal level is also checked by the shield layer by grounding only the receiving end of the predetermined core wire.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of identifying an object to be identified according to the present invention will be described with reference to the drawings of FIGS. FIG.
FIG. 1 is a block diagram showing a schematic configuration of an identification device using a first embodiment of an identification target object identification method according to the present invention.
In the figure, the cable A to be identified is insulation-coated with an insulating layer A1 and is housed in a protective tube together with other cables (not shown). One end of the metal conductor portion (core wire) A2 of the cable A (hereinafter referred to as "transmission end")
The transmitter 10 of the identification device is connected to the switch box 1, and the other end of the core wire A2 (hereinafter referred to as "reception end") is connected to the switch box 1.
Is connected to the ground via.

The identification device includes a switch box 1, a transmitter 10 for outputting a voltage signal of a specific frequency according to a voltage identification method or a constant frequency constant current signal according to a current identification method to a core wire A2, and a contact or non-contact with a cable A. And a receiver 3 provided for identifying the voltage signal or the constant frequency constant current signal.
0. This transmitter 10 and receiver 30
Are separated from each other by an arbitrary distance, and the receiver 30 is movably held by an operator and receives a signal at an arbitrary position away from the signal application point. The receiver 30 includes a voltage discriminating unit 31, an alternating current sensor 50, and a current discriminating unit 51. The voltage discriminating unit 31 detects a voltage signal of a specific frequency or the current discriminating unit 51 via the alternating current sensor 50. The constant frequency constant current signal is detected by the above, and the specific cable A is identified from the stored cables.

The switch box 1 comprises a switch 2 connected to the core wire A2, and an ammeter 3 connected between the switch 2 and the ground for measuring the supply current supplied to the cable A. It is possible to switch between grounding (when the switch is on) and opening (when the switch is off). The transmitter 10 synthesizes alternating current signals (specific frequency signals) of different frequencies specified in advance and applies the voltage signal to the core wire A2 by a voltage identification method, and a constant frequency constant current signal is generated to generate the core wire. The current signal supply unit 16, the core wire A2 and the voltage signal application unit 1 according to the method of identifying the current supplied to A2
1 or a selection switch 19 for switching the connection with the current signal supply unit 16 and an overload determination unit 20 for determining whether the impedance between the cable A and the ground is within the setting range of each identification method.

FIG. 2 shows a specific example of the configuration of the transmitter 10. The voltage signal applying unit 11 is, for example, a frequency 165 [Hz] or 390 [H] which is a frequency that is not usually used.
z], 1940 [Hz], and sine wave oscillation circuits 12 to 1 that oscillate specific frequency signals of three channels of sine waves, respectively.
4 and a combination application circuit 15 that combines the three-channel AC signals and applies the combination signal (voltage signal) to the core A2 via the switch 19. The sine wave oscillation circuits 12 to 14 are grounded.

The current signal supply unit 16 oscillates a constant frequency oscillation circuit 17 for oscillating a constant frequency, for example, a sinusoidal AC signal of 40 [Hz], and 40 [Hz] based on the constant frequency AC signal input. The constant current control circuit 18 outputs a constant frequency constant current signal of 10 [mA].
The constant frequency oscillator circuit 17 is grounded. As shown in FIG. 3, the constant current control circuit 18 adds the voltages V1 and V2 from the voltage follower circuits 18a and 18b to the output voltage V1 + V2.
= C3 for obtaining V3, and a power amplification circuit 18d for power-amplifying the output voltage V3 from the addition circuit 18c
And the potential difference V3-V2 = V1 across the output current (V1 /
r) = resistor for obtaining I. The constant current control circuit 18 performs constant current control so that the current I flowing through the cable A is always constant.

The selection switch 19 includes a voltage signal applying section 11
Alternatively, a signal from the current signal supply unit 12 is selected and either signal is output to the core wire A2. Overload determination unit 20
Is due to the difference in connection state between the selection switch 19 on the transmitter side and the switch 2 of the switch box 1 on the reception side.
It is installed in the transmitter to prevent it from being different from the grounding condition of each identification method. That is, generally, the impedance between the cable A to be identified and the ground is preferably high in the voltage signal identification method and low in the current signal identification method. Therefore, in the present embodiment, the measurement conditions are set to 10 [kΩ] or more in the voltage signal identification method and 1 [kΩ] or less in the current signal identification method.

The overload determination section 20 of this embodiment is provided with a resistor R provided between the combined application circuit 15 and the selection switch 19.
A differential amplifier circuit 21 that detects and amplifies the potential difference across the resistor R, a rectifying amplifier circuit 22 that converts the potential difference signal detected by the differential amplifier circuit 21 into direct current, and a constant current control circuit 18 are selected. Rectification amplifier circuit 23 connected between the switch 19 and converting the signal from the constant current control circuit 18 into direct current
And a preset threshold value (voltage value) and the rectifying / amplifying circuit 22.
Alternatively, it is composed of a comparator circuit 24 for comparing a signal (voltage value) input from the terminal 23 or 23 and a display circuit 25 having a lamp or a buzzer for notifying the comparison result.

When a voltage signal is applied, the overload determination unit 20 detects the potential difference across the resistor R, the differential amplifier circuit 21 amplifies it, and the rectification amplifier circuit 22 converts it to direct current. It is compared with the threshold value set at 24. Here, when the receiving end of the cable A is open, the impedance between the cable and the ground is large, so the potential difference between both ends of the resistor R becomes small, and conversely, when the receiving end is grounded, the Since the impedance between the grounds is reduced, the current flowing through the resistor R is increased and the potential difference between both ends is increased. Therefore, the overload determination unit 20 detects the change in the potential difference between both ends of the resistor R, detects the impedance between the cable and the ground, and determines the grounding state of the receiving end. That is, when a voltage signal is applied from the composite applying circuit 15 when the receiving end is grounded, the potential difference between both ends of the resistor R increases and exceeds the threshold value of the comparator circuit 24. Therefore, in the display circuit 25, for example, A lamp provided in the circuit can be turned on and at the same time a buzzer can be sounded to warn the operator of an overload.

When a current signal is applied, the current signal supply unit 1
In 6, the constant current control of the current flowing in the cable A is performed,
The overload determination unit 20 detects the voltage level at point B. Therefore, when the receiving end side of the cable A is grounded, the impedance between the cable and the ground is small, so the voltage level at the B point is low, and when the receiving end side is open, the voltage level at the B point is the comparator circuit 24. Therefore, in the display circuit 25, for example, a lamp provided in the circuit can be turned on and at the same time a buzzer can be sounded to warn the operator of an overload.

Therefore, in this embodiment, when each signal is being output from the transmitter 10 to the cable A, the grounding condition on the receiving end side is determined according to each condition, and a warning is issued if the grounding conditions are different. Therefore, it is possible to prevent the signal and ground conditions from being different. Further, in this embodiment, before starting the cable identification operation, the switch 2 of the switch box 1 is turned on to supply a current signal from the current signal supply unit 16 to the cable A, and the ammeter 3 checks the supply current. 80%
Confirm that the above is flowing to the cable A. Accordingly, in this embodiment, it is possible to confirm the leakage of the supply current due to the midway grounding of the specific cable A or the contact with another cable, and prevent an erroneous determination.

As shown in FIG. 4, the voltage identification section 31 of the receiver 30 is connected to the signal electrode 32 that is electrostatically coupled to the conductor portion of the specific cable A, and is connected to this signal electrode 32. Signal detection circuit 33 that detects the voltage signal (combined signal) of the above, an amplification circuit 34 that amplifies this voltage signal, and is capable of gain adjustment, and passes three types of specific frequency signals from this voltage signal. Band pass filters 35 to 37 and band pass filters 35 to 37
Smoothing circuits 38-40 connected to the low-pass filter 41 for removing high frequency components from the voltage signal,
A smoothing circuit 42 connected to the low-pass filter 41,
A noise calculation circuit 43 that calculates a noise component from the DC component from each smoothing circuit, comparator circuits 44 to 46 connected to the smoothing circuits 38 to 40, and a logical product operation of the comparison results from the comparator circuits 44 to 46. The AND circuit 47 and the display circuit 48 that displays a specific cable according to the output of the AND circuit 47. The frequency signals passed by the bandpass filters 35 to 37 are specific frequency signals (165 [Hz], 390 [Hz], 1940 [Hz] oscillated by the sine wave oscillation circuits 12 to 14.
z]).

That is, when the voltage signal identification method is used, the switch 19 of the transmitter 10 is set to the voltage signal applying section 11
Then, the overload determination circuit 20 determines that the switch 2 of the switch box 1 is off and the receiving end is open. Next, the synthesizing circuit 15 synthesizes the three types of specific frequency signals from the sine wave oscillating circuits 12 to 14,
The combined AC voltage signal (combined signal) is transferred to the cable A.
Is applied to the core wire A2.

The operator has the receiver 30, and the receiver 30
When the signal electrode 32 of No. 2 is applied to the surface of the cable A, a ground return circuit is formed by electrostatic coupling between the metal conductor (core wire) inside the cable and the signal electrode 32 and electrostatic coupling between the body of the operator and the ground. In the receiver 30, the combined signal applied to the specific cable A is detected by using electrostatic coupling. The signal input to the receiver 30 is amplified by the amplifier circuit 34, and then the band-pass filters 35 to 37 separate only three types of frequency signals from the input signal and pass them. This frequency signal is passed through the bandpass filters 35-35.
After being converted from an AC component into a DC component by the smoothing circuits 38 to 40 provided corresponding to 37, it is inputted to the comparator circuits 44 to 46 also provided corresponding to the noise compensating circuit 43. Is entered.

The high-frequency component of the input signal from the amplifier circuit 34 is removed by the low-pass filter 41 and converted into a DC component by the smoothing circuit 42, and then the noise calculation circuit 4
3 is input. The noise calculation circuit 43 subtracts the voltage V1, V2, V3 of the frequency signal separated by the band pass filters 35 to 37 from the total signal voltage VT converted into the DC voltage by the smoothing circuit 42 to reduce the noise component. The voltage VN = VT-V1-V2-V3 is calculated and output to the comparator circuits 44 and 45.

Threshold value VREF of the comparator circuits 44 to 46
1, VREF2, VREF3 are set according to the voltage level of the noise component output from the noise calculation circuit 43.
Although various threshold values can be set according to the noise component, in the present embodiment, the threshold level for each specific frequency signal is set as follows. VREF1 = (1/2) V3 + VN VREF2 = (2/3) V3 + VN VREF3 = 0.7 [V] fixed Therefore, the comparator circuits 44 to 46, when the voltage level of each input frequency signal is higher than this threshold level. , And output level “1” to the AND circuit 47. The AND circuit 47 sets the output to "1" only when the outputs from the comparator circuits 44 to 46 are "1". When the output from the AND circuit 47 is "1", the display circuit 48 turns on the lamp and sounds the buzzer to notify the operator that the cable to which the receiver 30 is applied is the specific cable A. You can

The alternating current sensor 50 of the receiver 30 is shown in FIG.
As shown in FIG. 5, the clamp type AC current sensor is based on the law of amperage integration, and detects the current signal in the cable and outputs it to the current identification unit 51. Current identification unit 51
Is an amplifier circuit 52 that amplifies a current signal input from the AC current sensor 50, a bandpass filter 53 that passes a signal of a constant frequency component, a rectifying / smoothing circuit 54 that converts the constant frequency signal into a DC component, It is composed of a comparator circuit 55 for comparing whether or not the signal of the DC component is within a preset range, and a display circuit 56 for displaying a specific cable according to the comparison result. The constant frequency component signal passed by the bandpass filter 53 corresponds to the constant frequency signal (40 [Hz]) oscillated by the constant frequency oscillating circuit 17 of the current supply unit 16.

That is, when the current signal identification method is used, the switch 19 of the transmitter 10 is set to the current signal supply unit 16
Then, the overload determination circuit 20 determines that the switch 2 of the switch box 1 is on and the receiving end is in the grounded state. Thus, in the current identification method, a closed circuit is formed through the ground on the transmitter side. Then, the constant frequency constant current signal is supplied from the current supply unit 16 to the core wire A2 of the specific cable A. In this embodiment, the current value of the constant current signal supplied from the transmitter is set to 10 [mA].

The current flowing in the cable A is constant under the control of the constant current control circuit 18 regardless of changes in the earth ground resistance and the core wire resistance. When the frequency of the supplied signal is high, the impedance between the cable conductor part and ground becomes small, so its effect cannot be ignored, and in order to increase the identifiable distance of the cable, the frequency of the supplied signal is usually increased. It is desirable to set low. Therefore, in this embodiment, the signal of the alternating current 40 [Hz] is used.

An output signal from the sensor 50 is amplified by an amplifier circuit 52 via a lead wire, and then a bandpass filter 53 extracts only a constant frequency signal component and removes a noise component. Next, this signal component is converted into direct current by the rectifying / smoothing circuit 54, and its magnitude is checked by the comparator circuit 55. If it is within a preset range, the comparator circuit 55 determines that the cable to which the sensor is applied is It is determined that the cable is the specific cable A, and the output level "1" is output to the display circuit 56. In this embodiment, the threshold value of the comparator circuit 55 is set within the range of 10 [mA] ± 2 [mA].

When the output from the comparator circuit 55 is "1", the display circuit 56 turns on the lamp and sounds the buzzer to inform the operator that the cable to which the receiver 30 is applied is the specific cable A. I can inform you. Therefore, in this embodiment, the overload determination circuit determines whether the receiving end of the specific cable to be identified is the open state or the grounded state, and if the open state is, the cable is identified using the voltage identification method, Further, in the case of the grounded state, the cables are identified by using the current identification method. Therefore, the identification accuracy of the cables can be improved by complementing the drawbacks and restrictions of both identification methods and combining their advantages. .

Further, in the present embodiment, the switching of the identification method and the switching of the open / grounded state of the cable receiving end can be performed by one switch, respectively, so that the connection between the specific cable and the identification device and the transmission from the transmitter are performed. A signal can be easily output. In this way, when conducting a search for a specific cable to be removed by using the two identification methods of the voltage identification and the current identification in combination, the transmitter side and the receiving end side are switched in addition to the operator who performs the exploration work. Since it requires a worker to switch between the two, it takes a lot of labor and labor, resulting in poor work efficiency.

Therefore, in the second embodiment of the present invention, the ground condition of the receiving end is changed by periodically switching the switch of the switch box connected to the receiving end of the specific cable, and the transmitter side Similar to the first embodiment, a voltage applying section and a current supplying section are incorporated, and the fact that the impedance between the cable and the ground changes in accordance with the change in the grounding condition of the receiving end is used to output from the transmitter to the cable. A method of identifying a cable for automatically switching the signal to be used will be described.

FIG. 6 is a block diagram showing the schematic arrangement of an identification device using a second embodiment of the identification method according to the present invention. In FIG. 6, the same components as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted. In FIG. 6, the switch 2 connected to the core wire A2 at the receiving end is controlled by the timer 4 to be switched on / off periodically. The switching cycle of the switch 2 is normally set to 100 [msec] to several seconds.

The voltage signal supply unit 11 is connected in series with the relay contact a, and the current signal supply unit 16 is connected in series with the relay contact b. The voltage signal supply unit 11 and the relay contact a and the current signal supply unit 16 and the relay contact b are
Connected in parallel, the voltage signal supply unit 11 and the current signal supply unit 16 output signals to the core wire A2 via the relay contacts a and b. An impedance detection circuit 26 is connected between the voltage signal supply unit 11 and the current signal supply unit 16 and the core wire A2.

The impedance detection circuit 26 determines the grounding condition of the receiving end by determining whether the impedance between the cable A and the ground is within the setting range of each detection method, and the switch 2 of the receiving end is switched. In this case, it has a function of automatically switching the signal output to the core wire A2. The impedance detection circuit 26 includes a resistor R connected in series with the voltage signal supply unit 11 and the current signal supply unit 16, and a voltage level detection circuit 27 for detecting a voltage level at a point C between the resistor R and the core wire A2. , A comparator circuit 28 that compares the detected voltage level with a preset threshold value to determine the grounding condition of the receiving end, and a relay coil 29 that turns on / off the relay contacts a and b according to the comparison result. It consists of and. The comparator circuit 28 has the same configuration as the comparator circuit 24 of the overload determination unit 20 shown in the first embodiment. Relay contacts a, b
Is switched by the current flowing through the relay coil 29, and in the present embodiment, when the current does not flow, the relay contact b is turned on and the current signal is the core wire A.
2 is set to be supplied.

Here, in the present embodiment, the switching cycle of the switch 2 is set to 200 [msec]. That is,
In the transmitter 10, the relay coil 29 is 200 [mse
c], the relay contacts a and b are turned on / off to switch between the current signal and the voltage signal, and the core wire A2 of the cable A is switched.
To give to. First, in the present embodiment, the switch 2 on the receiving end side is turned off to open the receiving end, and the receiver 30 searches for the target cable A by the voltage identification method. That is, when the receiving end is opened, the impedance between the cable and the ground increases, so that the voltage level at the point C rises, the voltage level exceeds the threshold value of the comparator circuit 28, and the current flows through the relay coil 29. When the relay contact a is turned on, the voltage signal application unit 1 by the voltage signal identification method
A voltage signal obtained by synthesizing one to three types of frequency signals is applied to the core wire A2 of the cable A.

In the receiver 30, the voltage discriminating section 31 based on the voltage discriminating method detects the voltage signal applied to the cable by using electrostatic coupling, extracts three kinds of specific frequency signals with a band pass filter, and smoothes them. The smoothing circuit converts it into direct current, removes the high frequency component from the voltage signal input by the low-pass filter, converts it into direct current with the smoothing circuit, and then calculates the noise component with the noise calculating circuit. And
The size of the specific frequency signal is checked by the comparator circuit, and if all the voltage levels of each specific frequency signal are higher than the threshold set according to the voltage level of the noise component, the cable measuring the voltage signal is the specific cable. Judge as A.

Further, when the switch 2 on the receiving end side is turned on and the receiving end is grounded by the control of the timer, the impedance between the cable and the ground becomes small. Then, the current flowing through the resistor R increases, the voltage level at the point C decreases, the voltage level falls below the threshold value of the comparator circuit 28, and no current flows in the relay coil 29. Therefore, no current flows through the relay coil 29, the relay contact b is turned on, and a constant frequency constant current signal is sent from the current signal supply unit 16 by the current signal identification method to the cable A.
Is supplied to the core wire A2.

In the receiver 30, the AC current sensor 50 detects the current signal in the cable, and in the current discriminating unit 51, the signal component of the frequency supplied from the transmitter 10 is taken out by the band pass filter to extract the noise component. Removed,
Next, the rectifying / smoothing circuit converts it to direct current, and the comparator circuit checks the magnitude of the current value. If it is within a preset range, the cable measuring the current signal is the specific cable A. Reconfirm.

Therefore, in this embodiment, the grounding condition of the receiving end of the specific cable is periodically switched, the grounding condition of the receiving end is judged on the transmitter side, and the voltage signal applying section and the current are determined according to the situation. Since the signal is alternately output from the signal supply section to the cable to identify the specific cable, simply connect the transmitter to the transmitting end and the switch box to the receiving end of the specific cable at the start of measurement. It is possible to automatically switch the signal of and the grounding / opening of the receiving end side. As a result, in this embodiment, it is possible to reduce manpower and labor at the time of work, and it is possible to perform the work in the same manner as when a cable is identified by one identification method.

As described above, in this embodiment, when the signal to be transmitted and the grounding condition of the receiving end of the cable are periodically switched to search for the specific cable to be removed, 200 [msec] is transmitted from the transmitter. The voltage signal and the current signal are switched in a cycle and given to the target cable, the receiver searches for the target cable by the voltage identification method, and then reconfirms whether the cable is the target cable by the current identification method. However, in this embodiment, the signal from the transmitter is 200 [ms
ec], the detection signal level of the receiver also changes at a cycle of 200 [msec]. In order to smooth this periodically changing signal level, it is necessary to set the time constant of the smoothing circuit to 600 times or more, which is three times the time constant, and in this embodiment, the time constant was set to 1 second. For this reason, in the present embodiment, in order to reliably identify the cable, the identification work of each of the two types of receivers requires a time of at least several seconds.

In view of this, in the third embodiment of the present invention, the signals on the same side are simultaneously transmitted from the transmitting side to the same specific cable by the voltage signal identifying method and the current signal identifying method, and the receiver side receives these signals at the same time. An identification method for identifying a cable will be described. FIG. 7 shows a third identification method according to the present invention.
It is a block diagram which shows the schematic structure of the identification device using the Example. Note that, in FIG. 7, the same components as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 7, the specific cable A has a shield layer A3, and the voltage signal from the voltage signal applying section 11 of the transmitter 10 is directly applied to this shield layer A3. The shield layer A3 on the end side is separated from the ground and opened. Also, the specific cable A
The receiving end of any of the core wires A2 to which the current signal supply unit 16 is connected is grounded.

In this state, the transmitter 10 has 16
A voltage signal obtained by synthesizing the specific frequency signals of 3 channels of 5 [Hz], 390 [Hz], and 1940 [Hz] is supplied from the voltage signal applying unit 11 to the shield layer A3 of the specific cable A.
Further, a constant frequency constant current signal of 40 [Hz], 10 [mA] is sent from the current signal supply unit 16 to the core wire A2 of the specific cable A.
To be sent at the same time. The voltage signals combined and output by the voltage signal application unit 11 are applied to the shield layer A3 after the power is amplified by the power amplifier circuit 60. Further, the overload determination unit 20 determines whether the shield layer A3 on the receiving end side is in the open state and whether the core wire A2 on the receiving end side is in the grounded state.

In the receiver 30, since the voltage signal and the current signal are simultaneously transmitted from the transmitter 10 to the same cable, the voltage signal detection circuit and the current detection sensor are affected by both frequency signals. However, in this embodiment, since the frequencies of the respective signals to be transmitted are different from each other, it is possible to easily separate the respective frequency signals by using the corresponding bandpass filters.

That is, in the voltage discriminating section 31, after separating three types of specific frequency signals from the voltage signals detected from the signal electrodes by a bandpass filter, they are smoothed, and at the same time, from the detected voltage signals. After removing the high frequency components and smoothing, the noise components are calculated. Then, the magnitude of the specific frequency signal is checked by the comparator circuit, and if all the voltage levels of each specific frequency signal are higher than the threshold value set according to the voltage level of the noise component, the cable measuring the voltage signal It is determined that the cable is the specific cable A.

In the current discriminating section 51, 40 [H] is selected from the current signals detected by the current detecting sensor 50.
Only the signal z] is separated by a bandpass filter, the magnitude of the current value is checked by a comparator circuit, and if it is within a preset range, it is determined that the clamped cable is the specific cable A. In addition, although the case where the specific cable has the shield layer has been described in the present embodiment, it is possible to identify the cable having no shield layer by using the present invention. In other words, when the specific cable does not have a shield layer, the core wires (all or more than half the total number of core wires) other than the predetermined core wire (the predetermined core wire may be plural) to which the current signal supply unit is connected. line)
A specific cable is identified by applying a voltage signal to. This embodiment can also be used when there is a shield layer.

Further, in the present embodiment, in the receiver, it is possible to attach a signal electrode for electrostatic coupling inside the clamp and integrate the voltage identifying section and the current identifying section. With this configuration, the operator can simultaneously detect the voltage signal and the current signal by only clamping the cable, check the signal levels of the two types, and comprehensively determine the specific cable to identify the specific cable.

Therefore, in the present embodiment, the signals are simultaneously output from the voltage signal applying section and the current signal supplying section to the specific cable to identify the cable, so that it is not necessary to switch the signal at the transmitter, and the identification is performed. Work time can be shortened and work efficiency can be improved. Further, in this embodiment, since the automatic switching circuit of the transmitter and the switch for connecting to the ground at the receiving end are unnecessary, the manufacturing cost can be reduced.

Incidentally, in these examples, the one in which three kinds of different frequency signals are combined by the voltage identification method is used.
The present invention is not limited to this, and one type of frequency signal or a combination of two or four or more types of frequency signals may be used. Further, in these examples, one type of AC constant current signal was used as a signal for exploration in the current identification method,
The present invention is not limited to this, and it is also possible to use a combined signal obtained by combining a plurality of AC constant current signals or a DC current signal. The use of this DC current signal is basically the same as the case of AC, but the receiver uses a clamp type DC current sensor. An AC component is removed from the detected signal through a filter, and a comparator circuit can be used to determine whether or not the cable is a target specific cable, as in the case of AC.

The object to be measured is, in addition to ordinary cables such as electric wires, for example, iron pipes, steel wire armored plastic pipes in which iron wires are wound around plastic pipes, and steel strands used as tension wires for bridges and the like. A long conductive piece such as a wire (steel wire) and a metal-reinforced fluid transportation pipe can be identified by the present invention.

[0056]

As described above, according to the present invention, in the method for identifying an object to be identified for identifying a predetermined object to be identified from among a plurality of electrically conductive objects to be identified, the first oscillator section Generates a voltage signal consisting of a predetermined frequency to be oscillated,
An applying step of directly applying the voltage signal to the predetermined object to be identified, and detecting the voltage signal by an electrostatic coupling method,
A constant frequency constant current signal is generated based on a voltage identification method including a first identification step of identifying a predetermined object to be identified from the detection result and a constant frequency signal oscillated from the second oscillator. A supplying step of directly supplying the constant frequency constant current signal to the predetermined object to be identified, and detecting a current signal supplied to the predetermined object to be identified by an electromagnetic induction method, and detecting the predetermined object to be identified from the detection result. A current identification method comprising a second identification step for identifying an object, determining the grounding state of the receiving end side of the predetermined object to be identified, and based on the result of the determination, the voltage identification method or the current Since the identification method is used, the two identification methods of the voltage identification method and the current identification method can be used together to compensate for each other's defects and the target object to be identified can be detected with high accuracy.

In the second and third aspects, the grounding condition on the receiving end side of the predetermined object to be identified is sequentially changed, and the grounding condition on the receiving end side of the predetermined object to be identified is grounded to the predetermined object to be identified. The voltage discrimination method or the current discrimination method is sequentially used based on the discrimination result according to the change in impedance between the transmitter and the receiver. Can be done automatically.

In the fourth and sixth aspects, in the identification method of the object to be identified for identifying a predetermined object to be identified from among a plurality of electrically conductive objects to be identified having a plurality of core wires, the first oscillation is provided. An applying step of generating a voltage signal having a predetermined frequency oscillated from a part and directly applying the voltage signal to a core wire other than a predetermined core wire of the predetermined object to be identified; and the voltage by the electrostatic coupling method. Constant current control based on a voltage identification method including a first identification step of detecting a signal and identifying a predetermined object to be identified from the detection result, and a constant frequency signal oscillated from a second oscillator. A step of generating a constant frequency constant current signal and supplying the constant frequency constant current signal directly to at least one predetermined core wire of the predetermined object to be identified; and the predetermined object to be identified by an electromagnetic induction method. Current signal supplied to the object A current identification method, which comprises a second detection step of detecting and detecting a predetermined object to be identified from the detection result. When identifying the predetermined object to be identified, the voltage identification method and the current identification method are used. Using the method simultaneously, in the applying step and the supplying step, to each core wire, while simultaneously outputting the voltage signal and the constant frequency constant current signal, only the receiving end side end of the predetermined core wire is grounded, Since it is not necessary to switch the signal at the transmitter, the time required for the identification work can be shortened and the work efficiency can be improved.

In the fifth and sixth aspects, when the predetermined object to be identified has a shield layer, in the supplying step, the voltage signal is directly applied to the core wire other than the predetermined core wire of the predetermined object to be identified or the core wire. Since the voltage is applied to the shield layer and only the receiving end of the specified core is grounded, switching of signals at the transmitter is not necessary even in this case, and the time required for identification work can be shortened and work efficiency can be improved. Can be improved.

According to the seventh and tenth aspects of the present invention, there is provided a device for identifying an object to be identified which identifies a predetermined object to be identified from among a plurality of electrically conductive objects to be identified. And a constant frequency constant signal based on the constant frequency signal oscillated from the second oscillating unit. A current-identification-type supply unit that generates a current signal and supplies the constant-frequency constant-current signal directly to the predetermined object to be identified; a determination unit that determines the grounding state of the identification side of the predetermined object to be identified; Detecting the voltage signal applied to the predetermined object to be identified by an electrostatic coupling method, and a transmission unit having a switching unit that switches the signal from the applying unit or the supply unit and outputs the signal to the predetermined object to be identified. , The predetermined target from the detection result A first identifying section for identifying another object and a second identifying section for detecting a current signal supplied to the predetermined object to be identified by an electromagnetic induction method and identifying the predetermined object to be identified from the detection result. And a receiving unit having the above, and the determination unit determines the grounding state of the receiving end side of the predetermined object to be identified according to the change in impedance between the predetermined object to be identified and the ground, and based on the result of the judgment. Since the voltage identification method or the current identification method is used, the two identification methods of the voltage identification method and the current identification method can be used together to compensate for the defects of each other and the target object to be identified can be accurately detected.

According to the eighth and tenth aspects, the changing means for sequentially changing the grounding condition of the receiving end side of the predetermined object to be identified, and the voltage signal having a predetermined frequency oscillated from the first oscillating section are generated, A constant-frequency constant-current signal is generated based on a constant-frequency signal oscillated from a voltage-discrimination type application unit that directly applies a voltage signal to the predetermined object to be identified, and the constant-frequency constant current signal is generated. The current identification type supply unit that directly supplies a constant current signal to the predetermined object to be identified, and the grounding condition for sequentially changing the receiving end side of the predetermined object to be identified is the impedance between the object to be identified and the ground. And a switching unit that sequentially switches the signal from the application unit or the supply unit according to the result of the determination and outputs the signal to the predetermined object to be identified, and electrostatic coupling. Depending on the method, the specified Detecting the voltage signal applied to the object, first identifies the predetermined identification target object from the detection result
And a second identification unit that detects a current signal supplied to the predetermined object to be identified by an electromagnetic induction method and identifies the predetermined object to be identified from the detection result. Therefore, different identification methods can be automatically switched and used together.

According to a ninth and a twelfth aspect of the present invention, there is provided a first identification object identifying device for identifying a predetermined identification object from among a plurality of electrically conductive identification objects having a plurality of core wires.
A voltage identifying method for generating a voltage signal having a predetermined frequency oscillated from the oscillating section and directly applying the voltage signal to a core wire other than a predetermined core wire of the predetermined object to be identified; A constant frequency constant current signal is generated based on a constant frequency signal oscillated from the second oscillating unit, and the constant frequency constant current signal is directly applied to at least one of the predetermined objects to be identified.
A current identification type supply unit for supplying to one predetermined core wire, and a determination unit for determining the grounding state of the receiving end side of the predetermined object to be identified, when identifying the predetermined object to be identified, A transmitting unit that simultaneously outputs the voltage signal and a constant frequency constant current signal to the corresponding core wires by the applying unit and the supplying unit, and a voltage signal applied to the predetermined object to be identified by an electrostatic coupling method. Detecting a current signal supplied to the predetermined object to be identified by an electromagnetic induction method, and detecting the predetermined object from the detection result. By providing a receiving unit having a second identifying unit for identifying the object to be identified and grounding only the receiving end side end of the predetermined core wire, it becomes unnecessary to switch the signal at the transmitter, Check two types of signal levels at the same time. Can.

In the eleventh and twelfth aspects, when the predetermined object to be identified has a shield layer, the supply unit directly outputs the voltage signal to a core wire other than the predetermined core wire of the predetermined object to be identified or the core wire. Since the signal is applied to the shield layer and only the receiving end side of the specified core wire is grounded, it is not necessary to switch the signal at the transmitter even in this case, and the signal level can also be checked by the shield layer. it can.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of an identification apparatus using a first embodiment of a method of identifying an object to be identified according to the present invention.

FIG. 2 is a block diagram showing a configuration of a transmitter shown in FIG.

3 is a circuit diagram showing a circuit configuration of a constant current control circuit shown in FIG.

4 is a block diagram showing a configuration of a voltage signal applying unit and a voltage identifying unit of the voltage signal identifying system shown in FIG.

5 is a block diagram showing a configuration of a current signal supply unit and a current identification unit of the current signal identification system shown in FIG.

FIG. 6 is a block diagram showing a schematic configuration of an identification device using a second embodiment of the method of identifying an object to be identified according to the present invention.

FIG. 7 is a block diagram showing a schematic configuration of an identification apparatus using a third embodiment of the method of identifying an object to be identified according to the present invention.

[Explanation of symbols]

 1 Switch Box 10 Transmitter 11 Voltage Signal Applying Section 16 Current Signal Supplying Section 19 Selection Switch 20 Overload Determination Section 30 Receiver 31 Voltage Discriminating Section 50 Current Detection Sensor 51 Current Discriminating Section A Specific Cable A2 Core Wire A3 Shield Layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kim Toji, 2-6-1, Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd. (72) Inventor, Kunio Kuroda 1-2-23, Ikenohata, Taito-ku, Tokyo No. Nippon Electric Construction Co., Ltd.

Claims (12)

[Claims] 1. A method of identifying an object to be identified for identifying a predetermined object to be identified from among a plurality of electrically conductive objects to be identified, wherein a voltage signal having a predetermined frequency oscillated from a first oscillator is provided. An applying step of generating and directly applying the voltage signal to the predetermined object to be identified, and a first identifying step of detecting the voltage signal by an electrostatic coupling method and identifying the predetermined object to be identified from the detection result. And a constant frequency constant current signal generated based on a constant frequency signal oscillated from the second oscillating unit, and the constant frequency constant current signal is directly supplied to the predetermined object to be identified. Supply process,
A current identification method comprising a second identification step of detecting a current signal supplied to the object to be identified by an electromagnetic induction method and identifying a predetermined object to be identified from the detection result. A method for identifying an object to be identified, characterized in that the grounding condition of the receiving end side of the object to be identified is determined, and the voltage identification method or the current identification method is used based on the determination result. 2. A method for identifying an object to be identified for identifying a predetermined object to be identified from among a plurality of electrically conductive objects to be identified, wherein a voltage signal having a predetermined frequency oscillated from a first oscillating unit is supplied. An applying step of generating and directly applying the voltage signal to the predetermined object to be identified, and a first identifying step of detecting the voltage signal by an electrostatic coupling method and identifying the predetermined object to be identified from the detection result. And a constant frequency constant current signal generated based on a constant frequency signal oscillated from the second oscillating unit, and the constant frequency constant current signal is directly supplied to the predetermined object to be identified. Supply process,
A current identification method comprising a second identification step of detecting a current signal supplied to the object to be identified by an electromagnetic induction method and identifying a predetermined object to be identified from the detection result. While sequentially changing the grounding condition of the receiving end side of the identification object, the grounding condition of the receiving end side of the predetermined object to be identified is determined, and based on the determination result, the voltage identification method or the current identification method is sequentially applied. A method for identifying an object to be identified, which is used by switching. 3. The object to be identified comprises a cable,
The method for identifying an object to be identified according to claim 1 or 2, wherein the grounding condition of the predetermined cable is determined according to a change in impedance between the predetermined cable and the ground. 4. A method for identifying an object to be identified for identifying a predetermined object to be identified from among a plurality of electrically conductive objects to be identified having a plurality of cores therein, wherein the first oscillator oscillates. An applying step of generating a voltage signal having a predetermined frequency and directly applying the voltage signal to a core wire other than a predetermined core wire of the predetermined object to be identified, and detecting the voltage signal by an electrostatic coupling method, A constant frequency constant current signal is generated based on a voltage identification method including a first identification step of identifying a predetermined identification target object from the detection result and a constant frequency signal oscillated from the second oscillating unit. A supplying step of directly supplying the constant frequency constant current signal to at least one predetermined core wire of the predetermined object to be identified, and detecting a current signal supplied to the predetermined object to be identified by an electromagnetic induction method. , A predetermined target based on the detection result A second identification step for identifying another object, and a current identification method comprising the step of applying the voltage identification method and the current identification method at the same time when the predetermined object to be identified is identified. In the supplying step, the voltage signal and the constant-frequency constant-current signal are simultaneously output to the corresponding core wires, respectively, to identify the object to be identified. 5. The object to be identified comprises a cable,
When the predetermined cable has a shield layer, the voltage signal is directly applied to a core wire other than the predetermined core wire of the predetermined cable or the shield layer in the supplying step. A method for identifying an object to be identified. 6. The identification method according to claim 4, wherein only the receiving end side end portion of the predetermined core wire is grounded.
Alternatively, the method for identifying an object to be identified according to item 5. 7. An identification target object identification device for identifying a predetermined identification target object from among a plurality of conductive identification target objects, wherein a voltage signal having a predetermined frequency oscillated from the first oscillating section is supplied. A constant frequency constant current signal is generated based on a voltage identification type application unit that generates and applies the voltage signal directly to the predetermined object to be identified and a constant frequency signal oscillated from the second oscillating unit. A current identification type supply unit that directly supplies the constant frequency constant current signal to the predetermined object to be identified, a determination unit that determines the grounding state of the receiving end side of the object to be identified, the applying unit or the supply unit. Transmitting means having a switching unit for switching a signal from a unit to output to the predetermined object to be identified, and detecting a voltage signal applied to the predetermined object to be identified by an electrostatic coupling method, and from the detection result Identifying the predetermined object to be identified And a second identification unit that detects a current signal supplied to the predetermined object to be identified by an electromagnetic induction method and identifies the predetermined object to be identified from the detection result. A discriminating device for an object to be discriminated, characterized in that the discriminating section discriminates a grounding condition of a receiving end of a predetermined object to be discriminated, and based on the discrimination result, the voltage discriminating method or the current discriminating method is used. . 8. An apparatus for identifying an object to be identified, which identifies a predetermined object to be identified from among a plurality of electrically conductive objects to be identified, wherein a grounding state of a receiving end side of the object to be identified is sequentially changed. Changing means for generating a voltage signal having a predetermined frequency oscillated from the first oscillating section and directly applying the voltage signal to the predetermined object to be identified; and a second oscillating section. A constant-frequency constant-current signal based on a constant-frequency signal oscillated from the unit, and supplies the constant-frequency constant-current signal directly to the predetermined object to be identified; A discriminating unit that discriminates the grounding condition of the receiving end side of the identification target that is sequentially changed, and a switching unit that sequentially switches the signal from the applying unit or the supply unit according to the determination result and outputs the signal to the predetermined identification target. And a capacitive coupling method Therefore, the voltage signal applied to the predetermined object to be identified is detected, and the first identifying section for identifying the predetermined object to be identified from the detection result and the predetermined object to be identified are supplied by the electromagnetic induction method. And a receiving unit having a second identifying unit for identifying a predetermined object to be identified from the detection result, and an identification device for the object to be identified. 9. An identifying object identifying device for identifying a predetermined object to be identified from among a plurality of electrically conductive objects to be identified having a plurality of cores therein, wherein the first oscillator oscillates. A voltage identification type application unit that generates a voltage signal having a predetermined frequency and directly applies the voltage signal to a core wire other than a predetermined core wire of the predetermined object to be identified, and is oscillated from a second oscillating unit. A constant-frequency constant-current signal is generated based on a constant-frequency signal, and the constant-frequency constant-current signal is directly supplied to at least one predetermined core wire of the predetermined object to be identified. When,
A discriminating unit for discriminating the grounding condition of the receiving end side of the predetermined object to be identified, and the applying unit and the supplying unit are connected to the corresponding core wires when identifying the object to be identified. Transmitting means for simultaneously outputting the voltage signal and the constant frequency constant current signal; and detecting the voltage signal applied to the predetermined object to be identified by an electrostatic coupling method, and detecting the predetermined object to be identified from the detection result. Receiving having a first identifying unit for identifying and a second identifying unit for detecting a current signal supplied to the predetermined object to be identified by an electromagnetic induction method and identifying the predetermined object to be identified from the detection result. And a means for identifying an object to be identified. 10. The object to be identified comprises a cable, and the discriminating section discriminates a grounding state of the predetermined cable according to a change in impedance between the predetermined cable and a ground. Item 8. The identification device for an object to be identified according to item 8 or 9. 11. The object to be identified comprises a cable, and when the predetermined cable has a shield layer,
The apparatus for identifying an object to be identified according to claim 9, wherein the supply unit directly applies the voltage signal to a core wire other than a predetermined core wire of the predetermined cable or the shield layer. 12. The identification device for an object to be identified according to claim 9 or 11, wherein an end portion of the predetermined core wire on the receiving end side is grounded.