KR100186365B1 - Switchgear monitoring device for distribution lines - Google Patents

Abstract

The present invention relates to a monitoring device for a switchgear for a distribution line, and a conventional manual switchgear has an absolutely disadvantageous structure to be used by applying functions such as self-diagnosis, and thus can not actively cope with efficient management of power . Therefore, the present invention is characterized by comprising: a current sensor (CT) and a voltage sensor (PD) installed on each of the phases for detecting the electric quantity of the line; A line state sensing unit (100-400) for calculating a quantity of electricity detected through the sensor to determine a steady state and an overload state of the line; (101, 201, 301, 401) for opening / closing the main contact (MC) of the switch according to the control output of the line condition sensing unit (100-400) and supplying driving power to a terminal provided in each circuit; A display unit 500 for monitoring and controlling the state of each circuit and transmitting / receiving information to / from the outside; A communication unit 600 for managing external transmission / reception; And a battery detecting unit 700 for detecting the charging state of the driving power of the automatic driving unit and checking the normal and abnormal states of the driving power of the automatic driving unit to perform a self- In communication, the user can efficiently manage the power according to the line capacity.

Description

Switchgear monitoring device for distribution lines

The present invention relates to a switchgear, and more particularly, to a switchgear which is suitable for installation and operation in distribution automation, so that control and monitoring of the switchgear and the voltage and current of the linegear are automatically detected, And more particularly to a switchgear monitoring device for a distribution line.

In order to use the power effectively, it is necessary to continuously monitor each load. There is no problem of the lightning in the track, but the heavy load and overload prompt the deterioration of the line and the damage is significant. Proper operation of the installed switchgear can have a significant effect.

The conventional manual switch is a structure which can only open and close the line. However, when the manual switch is provided with a device capable of detecting and opening the electric quantity of the line, The switch can be switched remotely with load switching.

Hereinafter, the technical contents of the conventional and improved embodiments of the present invention will be described.

Fig. 1 is a connection configuration diagram of a conventional power distribution line disposal system. As shown in Fig. 1, a main contact MC for supplying electricity to a terminal provided in each circuit (circuit 1, circuit 2, )and; And is connected to a manual opening / closing part SC for manually opening / closing the main contact MC.

Hereinafter, a conventional technique configured as described above will be described.

The switch that is currently used is a structure that opens and closes the line. It can be operated manually in the field and does not have any monitoring device.

In other words, it is a passive type switch which is used for manual opening and closing and line change by manual operation in the field.

When such a passive switch is installed, electric wires are connected to terminals provided in each circuit by means of connecting lines, and electric power is supplied to each circuit (circuit 1, circuit 2, circuit 3, The main contact MC can be opened and closed by the manual opening and closing part SC and is not manually operated from the outside by a switch operation (on-site remote operation) but is purely manual operation.

Today, the desire to use power efficiently is significant, self-diagnostics of facilities are being done and applied.

However, the manual switch used in the prior art has an absolutely disadvantageous structure to be used by applying functions such as self-diagnosis, and thus can not actively cope with efficient power management.

Accordingly, an object of the present invention is to provide a self-diagnosis and monitoring function that can not be performed in a manual switch, separately installed in a main body of a switchgear so that a user can efficiently manage power in line with a line capacity in a field and communication And to provide a monitoring device for a line power switch.

1 is a connection configuration diagram of a conventional switchgear.

2 is a block diagram of a monitoring device of a switch for a distribution line according to the present invention.

Fig. 3 is a detailed circuit diagram of the distribution line monitoring unit in Fig. 2; Fig.

Fig. 4 is a detailed circuit diagram of the voltage detecting unit and the test unit in Fig. 3; Fig.

DESCRIPTION OF THE REFERENCE NUMERALS

100-400: Line condition detection unit 500: Display unit

600: communication unit 700: battery detection unit

In order to accomplish the above object, the present invention provides a circuit breaker monitoring device comprising: a current sensor (CT) and a voltage sensor (PD) provided on each phase for detecting the amount of electricity in a line; A line state sensing unit (100-400) for calculating a quantity of electricity detected through the sensor to determine a steady state and an overload state of the line; (101, 201, 301, 401) for opening / closing the main contact (MC) of the switch according to the control output of the line condition sensing unit (100-400) and supplying driving power to a terminal provided in each circuit; A display unit 500 for monitoring and controlling the state of each circuit and transmitting / receiving information to / from the outside; A communication unit 600 for managing external transmission / reception; And a battery sensing unit 700 for sensing the charging state of the driving power source of the automatic driving unit and checking the normal and abnormal states thereof.

As shown in FIG. 3, the line condition detecting unit includes a current converting unit 10 for receiving a current signal sensed by the current sensor and converting the current signal into a voltage signal having an appropriate size; A voltage converter 60 for converting the voltage of each phase to a proper magnitude; A multiplexer (20) receiving the output voltage of the current converting unit (10) and selecting one voltage value according to the selection signal and outputting the selected voltage value; An operational amplifier 30 for amplifying the voltage selected through the multiplexer 20 to a predetermined magnitude; An analog / digital converter 40 for converting analog signals of the voltage converter 60 and the operational amplifier 30 into digital signals and outputting the digital signals; A phase detector 70 for comparing the phase of each voltage signal detected by the voltage converter 60 with a reference value to detect a phase difference for each circuit; And a self-diagnosis unit (80) for monitoring the state of each circuit using the phase difference of each circuit detected through the phase detection unit (70) and controlling the selection of the multiplexer (30) accordingly.

The operation and effect of the present invention will be described in detail as follows. When a current flows through the line, the current sensor CT installed in the switch detects the load current, and the voltage sensor PD detects the voltage of each phase and outputs it to the line condition sensing unit 100-400.

Then, the line condition sensing unit 100-400 performs the following operation.

Since the operations of the line condition detecting unit 100-400 are all the same, only the operation of the line condition detecting unit 100 will be described with reference to FIG.

The load current detected through the current sensor CT is divided by the resistors R1 and R2 and the high frequency components are removed by the low pass filter composed of the resistors R3 and R4 and the capacitor CR Converted into a voltage signal of an appropriate size through the operational amplifier OP-A and input to the multiplexer 20.

As a result, the current signals CTA, CTB, CTC and CTN of the phases A, B, C and N from which the high frequency components have been removed are inputted to the multiplexer 20.

Then, the output signal of the multiplexer 20 is amplified by the operational amplifier unit 30 so that the signal voltage magnitude of each of the amplifiers OP-B, OP-C, Amplifiers OP-D and OP-E, respectively, and are transmitted to the analog / digital converter 40. The OP-

At this time, the voltage detected through the voltage sensor PD is converted into an appropriate size through the op-amp OP-F of the voltage converting unit 60, and then the voltage is detected by a low-pass filter composed of a resistor R19 and a capacitor C2 The high frequency component is removed and converted to an appropriate size VA-0 through the operational amplifier OP-G and transferred to the analog / digital conversion unit 40.

In this way, the voltage of each phase is converted into an appropriate size (VA-0) (VB-0) (VC-0) through the operational amplifier of the voltage converting unit 60 and transferred to the analog / digital converting unit 40.

The analog / digital conversion unit 40 converts the analog signal to digital by the instruction of the microprocessor 50 from the magnitude of the current and voltage through the operational amplifier 30 and the voltage converter 60, 50) to be stored.

The self-diagnosis unit 80 includes a transistor Q10 and resistors R13, R14 and R15 for monitoring the multiplexer 20 and the operational amplification unit 30. The self-diagnosis unit 80 includes a microprocessor 50, The transistor Q10 of the self-diagnosis unit 80 is turned on at predetermined intervals to supply a constant voltage divided by the resistor R14 (R15) to the multiplexer 20. [

The multiplexer 20 receives the output voltage of the self-diagnosis unit 80 from the operational amplifier unit 30 and receives the amplification ratio of each operational amplifier from the microprocessor 50, And the normal operation state of the operational amplifier 30 can be monitored at all times.

The output voltage VA-0 output from the voltage conversion unit 60 to the analog / digital conversion unit 40 is input to a comparator COMP-A of the phase detector 70 and compared with a reference voltage, And outputs it to the microprocessor 50.

As a result, the output voltage VA-0 (VB-0) (VC-0) of each phase is compared through the comparator of the phase detector 70 and outputted to the microprocessor 50 as a square wave.

Accordingly, the microprocessor 50 receives the output voltage of the phase detector 70 and determines whether the voltage converter 60 and the anomaly detector 70 are in a normal state or an abnormal state.

There are a display unit 500 for transmitting and receiving necessary for opening and closing each circuit, and a communication unit 600 for managing external transmission and reception.

If a monitoring device having the structure described above is installed in a manual switch, it is easy to monitor and control. If a communication unit 600 is provided for communication with the outside, control and monitoring of the switches can be collectively performed in the power distribution control room The power management can be efficiently performed as well as the load management in the distribution line.

Separately, the automatic driving units (101, 201, 301, 401) for opening and closing the opening and closing units are used as batteries as driving power sources.

The battery floats due to battery charge.

The battery unit 700 is configured to test the state of charge of the battery. Referring to FIG. 4, the battery unit 700 will be described below.

When the battery test switch is pressed from the outside, the photocoupler OP6 of the test circuit unit 701 operates and an output signal of a predetermined period is inputted to the input terminal T of the monostable vibrator 701a.

The monostable vibrator 701a outputs a signal through the output terminal O after a predetermined time determined by the time constant resistor R30 and the capacitor C30 to operate the photocoupler OP5. As the photocoupler OP5 operates, the relay K10 is turned on and operates.

Therefore, the relay K10 is connected to the battery BATTERY through the resistor R. [

Then, the voltage check unit 702a of the voltage detector 702 detects the size of the battery voltage, determines whether the battery voltage is normal or abnormal, and operates or cuts off the photocoupler OP4 to turn on the contact signal for the relay K1, And outputs it to the microprocessor of the state detection unit 100-400 so as to be noticed.

INDUSTRIAL APPLICABILITY As described above, the present invention has an effect of allowing a user to efficiently manage power in line with a line capacity in the field and in communication by performing self-diagnosis which can not be performed by a manual switch and adding a monitoring function separately.

Claims (6)

Current / voltage detection means comprising a current sensor (CT) and a voltage sensor (PD) installed on each phase for detecting the electric quantity of the line; Line condition detecting means for calculating an electric quantity detected by the current / voltage detecting means to determine a steady state and an overload state of the line; An automatic driving means for opening and closing the main contact according to the control output of the line condition detecting means to supply driving power to a terminal provided in each circuit; Battery detecting means for testing a charged state of the driving power source and determining normal and abnormal states; Display means for monitoring and controlling the state of each circuit and transmitting and receiving information to and from the outside; And communication means for managing external transmission / reception. The apparatus according to claim 1, wherein the line condition sensing means comprises current conversion means for receiving the current signal sensed by the current sensor and converting the received current signal into a voltage signal of an appropriate size; Voltage conversion means for converting the voltage of each phase to an appropriate size; A multiplexer for receiving an output voltage of the current converting means and selecting one voltage value according to a selection signal and outputting the selected voltage value; Amplifying means for amplifying the selected voltage through the multiplexer to a predetermined magnitude; Analog / digital conversion means for converting the analog signals of the voltage conversion means and the operational amplification means into digital signals and outputting the digital signals; Phase detecting means for comparing the phase of the voltage signal of each phase detected by the voltage converting means with a reference value to detect a phase difference for each circuit; And a self-diagnosis means for monitoring the state of each circuit using the phase difference of each circuit detected through the phase detection means and controlling the selection of the multiplexer accordingly. [3] The apparatus of claim 2, wherein the voltage converting means comprises: first amplifying means for amplifying the input voltage to a predetermined magnitude; A filtering means for eliminating a high frequency component by passing the output of the first amplifying means through a resistor and a capacitor; And second amplifying means for amplifying the signal filtered through the filtering means to a predetermined magnitude and outputting the amplified signal. 3. The microcomputer according to claim 2, wherein the self-diagnosis means comprises: a transistor for receiving an output of the microprocessor through a resistor; And a resistor for dividing a voltage of the power supply voltage terminal (VCC) through the transistor. The switch monitoring apparatus for a distribution line according to claim 1, wherein the driving power supplied to the terminal uses a battery. 2. The battery pack of claim 1, wherein the battery sensing means comprises: a test circuit for testing a voltage state; And voltage detection means for monitoring an abnormal voltage detection in accordance with an output state of the test circuit.