JPH0633081U - Electricity meter with transmitter - Google Patents

Abstract

(57) [Summary] [Purpose] To eliminate the error between the measured value on the meter display of the watt-hour meter itself and the measured value remotely measured via the transmitter. [Structure] 2 generated by rotation of rotor of watt hour meter
Rotation direction detecting means 17 for detecting whether the rotation direction of the rotor is normal or reverse based on the phase relationship between the two-phase signals of the pair of optical coupling elements PI1 and PI2, and the two-phase signals are added by the detection of the normal rotation to add the reverse rotation signal. By subtracting the two-phase signal by detection,
The counting means 18 for counting the measured value is provided so that the transmission pulse signal proportional to the net rotation amount of the rotor is output.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is equipped with a transmission device that emits a signal proportional to the amount of electricity used for remotely monitoring the measured value of the electricity meter or automatically reading the measured value of the electricity meter. It is related to the improvement of the electricity meter.

[0002]

[Prior art]

 As shown in FIG. 7, the induction type watthour meter installed in the AC power distribution system is rotatably supported by the magnetic flux generated by the current flowing in the current coil 31 and the magnetic flux generated by the voltage applied to the voltage coil 32. A rotating magnetic field is generated in the rotor 33 formed of a metal disk having good conductivity, and the rotor 33 rotates in the same direction as the rotating magnetic field in proportion to the electric power. The mechanical metering display unit 36 is driven by the gear group 35 coupled to, and the electric energy is displayed from a display window (not shown) of the electric energy meter. Further, the braking magnet 37 applies braking to the rotation of the rotor 33.

Note that the electric energy meter needs various compensating devices for causing the rotor 33 to generate a rotational force accurately proportional to electric power, but the description thereof is omitted here.

In recent years, for the purpose of improving efficiency in power management, rationalizing power supply and demand, and the like, the amount of electric power used for remotely monitoring the amount of electric power used by consumers or for automatically reading the amount of electric power has been used. A watt-hour meter equipped with a transmitter that sends an electric signal proportional to the amount of electric power from the meter has been put into practical use.

FIG. 8 is a diagram showing a structure of a known two-phase signal generating section and a configuration of a transmitting device. As shown in FIG. 8A, the rotating shaft of the rotor 33 of the watt hour meter is shown. A signal disk 39 provided with a number of slits 38 (five slits in FIG. 8A) is attached to 34, and the signal disk 39 is attached to two sets of the light-emitting element 40a and the light-receiving element 40b of the optical coupling element 40. The slit 38 turns on and off the light receiving element 40b to generate two-phase signals having a phase difference with each other. Then, as shown in FIG. 8B, the normal rotation detection circuit 41 detects the phase relationship of the two-phase signals, and the signal is output to the pulse number conversion circuit 42 only when the rotor 33 is in the normal rotation, and the frequency division is performed. A transmission pulse signal is output from the transmission device via the circuit 43 and the pulse width shaping circuit 44. The setting switch 45 is a switch for switching between the electric energy and the number of pulses, that is, the pulse weight.

In the induction type watt hour meter, since the rotating direction of the rotor 33 follows the direction of the rotating magnetic field, when measuring the amount of electric power of a motor load such as an elevator, when the elevator rises, Is energized by the motor, and the rotor 33 of the watt hour meter rotates forward, but when the elevator descends, the motor is not energized because it descends due to gravity, and conversely, electric power is generated from the motor and the watt hour meter The current flowing through the current coil 31 is in the opposite direction, and the rotor 33 of the electricity meter tries to rotate in the opposite direction.

However, the reverse rotation prevention mechanism (not shown) is usually provided in the watt hour meter so that the rotor 33 does not measure the reverse rotation because it is not normal power. The child 33 is structured so as to stop within one rotation at maximum in the reverse rotation.

[0008]

[Problems to be solved by the device]

 When measuring the amount of electric power such as a motor load, when the rotor 33 rotates in the reverse direction, the mechanical metering display of the watt-hour meter (36 in FIG. 7) indicates that the rotor 33 rotates in the reverse direction corresponding to one rotation at maximum. Weigh.

In the conventional transmitter in the watt-hour meter with a transmitter, a signal is output only for the forward rotation of the rotor 33 as described above, and the reverse rotation of the rotor 33 is output as a signal output. Is ignored, the signal transmitted from the conventional transmitting device to the distance is not measured for the amount of reverse rotation, and thus an error occurs in the measured values of both. That is, since the antiphase two-phase signal generated by the signal disk 39 is not subtracted by the transmitter of FIG. 8 (b), the measured value of the electric energy in the distant place always appears as a plus error and is used for a long time. In some cases, it causes a considerable error.

An object of the present invention is to solve the above-mentioned problems and to prevent an error between a measured value on a meter display portion of the watt-hour meter itself and a measured value remotely measured via a transmitter. It is to provide an electric energy meter with a transmitting device.

[0011]

[Means for Solving the Problems]

 The present invention is directed to a rotating direction detecting means for detecting whether the rotating direction of the rotor is normal or reverse based on the phase relationship of the two-phase signals of the two sets of optical coupling elements generated by the rotation of the rotor of the watt hour meter, and the normal rotating direction detecting means. Counting means is provided for counting the measured values by adding the two-phase signals by detection and subtracting the two-phase signals by detecting reverse rotation.

[0012]

[Action]

 In the present invention, the signal disc that rotates integrally with the rotor rotates between the light emitting element and the light receiving element of the two sets of optical coupling elements, so that a two-phase signal is generated in the optical coupling elements, and a positive signal is generated. The two-phase signal at the time of rotation is added to the measured value, the two-phase signal at the time of reverse rotation is subtracted from the measured value, and the transmission pulse signal is output for each predetermined measured value according to the set predetermined transmission constant.

[0013]

【Example】

 FIG. 1 is a block diagram of a transmitter of an electric energy meter with a transmitter, which is an embodiment of the present invention. Also, FIG. 2 is a circuit diagram of the transmitting device. Further, FIG. 3 is a diagram showing an optical coupling element and a signal disk for detecting the rotation amount and rotation direction of the rotor. The configuration of the transmitting device will be described with reference to FIGS. 1, 2 and 3.

The optical coupling element circuit 1 is composed of two optical coupling elements PI1 and PI2 and a resistor R1 which are arranged adjacent to each other, and is coupled to a rotary shaft 3 of a rotor 2 as shown in FIG. A signal disc 5 having a plurality of slits 4 rotates between the light emitting elements PI1a and PI2a of the two optical coupling elements PI1 and PI2 of the optical coupling element circuit 1 and the light receiving elements PI1b and PI2b, and Two-phase signals having different phases are output from the light receiving elements PI1b and PI2b of the optical coupling elements PI1 and PI2, and are input to the central control circuit 7 of the transmitter 6.

The central control circuit 7 is composed of a semiconductor integrated circuit IC1 for arithmetic processing, capacitors C6, C7, C9, C10, and resistors R5, R6, and performs the following control operation. (1) The phase relationship between the two-phase signals (metering pulse signals) from the optical coupling elements PI1 and PI2 is detected, and the normal rotation and the reverse rotation of the signal disk 5 (rotor 2) are detected. (2) The two-phase signals from the optical coupling elements PI1 and PI2 are counted, and the electric energy is integrated and measured. (3) The transmission pulse signal proportional to the integrated and measured electric energy is output to the transmission pulse output circuit 9 with a predetermined transmission constant such as a meter constant and a pulse width and a signal format. (4) By connecting the transmission constant setting means (not shown) to the transmission constant input terminal t from the outside, the transmission constant and the signal format data are written and read in the constant storage circuit 8.

The constant storage circuit 8 includes a semiconductor integrated circuit IC2 for non-volatile memory and a capacitor C8, and stores the transmission constant and signal format of the transmission pulse signal.

The transmission pulse output circuit 9 is composed of a transistor Q2, a mercury contact relay RY, and a diode D2, and outputs non-voltage contact signals from the output terminals O1 and O2.

The crystal oscillating circuit 10 oscillates the clock signals of the system clock and the timer clock by the crystal oscillator XTAL.

The transmission constant input / output circuit 11 is composed of a transistor Q1 and resistors R2, R3 and R4, and externally connects a transmission constant setting means (not shown) to the transmission constant input terminal t (connector CN). Thus, the transmission constants such as instrument constants and pulse widths and the signal format data are written and read in the constant storage circuit 8 via the central control circuit 7.

The power failure detection circuit 12 is a voltage comparison circuit composed of a voltage detector IC4, a diode D3, a capacitor C5, and resistors R7 and R8. The power failure detection circuit 12 detects a power failure and a power recovery state, and the central control circuit 7 Output a reset signal.

The protection circuit 13 is composed of a filter coil L and a surge absorber SA, and protects each circuit from an abnormal voltage that enters the power supply terminals P1 and P2.

The voltage dividing circuit 14 is composed of a resistor R1 and a capacitor C1 and divides the input voltage to the rectifying circuit 15. The capacitance of the capacitor C1 is changed depending on whether the AC voltage applied to the power supply terminals P1 and P2 is 100 V or 200 V, and the voltage division ratio is changed.

The rectifier circuit 15 full-wave rectifies the AC input voltage by the rectifier D1, the Zener diode ZD, and the capacitor C2, and supplies the AC voltage to the constant voltage circuit 16.

The constant voltage circuit 16 stabilizes the DC voltage that is full-wave rectified by the constant voltage element IC3 and the capacitors C3 and C4.

The optical coupling element circuit 1 is configured on one printed wiring board, the rest of the circuits are configured on a different printed wiring board, and a jumper wire J is provided between these two printed wiring boards. Connected.

FIG. 4 is a diagram showing output waveforms of two-phase signals from the two sets of optical coupling elements PI 1 and PI 2 of the light emitting element circuit 1. FIG. 4A shows that the rotor 2 of the watt hour meter is positive. Output waveforms from the optical coupling elements PI1 and PI2 when rotated, and FIG. 4B shows output waveforms from the optical coupling elements PI1 and PI2 when the rotor 2 of the watt hour meter rotates in the reverse direction. FIG. 5 is a diagram showing the control function of the central control circuit 7 as a block.

FIG. 6 is a diagram showing state transitions of two-phase signals from the two sets of optical coupling elements PI1 and PI2 of the optical coupling element circuit 1.

As shown in FIG. 6, the state is not output to both the optical coupling elements PI1 and PI2, the state is output to the optical coupling element PI1, and the state is not output to the optical coupling element PI2, and the state is output to the optical coupling element PI1. When the rotator 2 rotates in the forward direction when the rotator 2 rotates in the positive direction, the photocoupler PI2 has an output, the optical coupler PI2 has no output, and the photocoupler PI2 has an output. As shown in FIG. 4 (a), a two-phase signal such that the signal from the optical coupling element PI 1 is always advanced from the optical coupling element circuit 1 to the central control circuit 7, such as →→→→, This state transition is detected by the normal rotation detection means 17a of the rotation direction detection means 17 of the central control circuit 7, and the counting means 18 is incremented by +1 each time one cycle of the transition of the two-phase signal is detected, and the counting means 18 is added. Count value reaches the preset value A pulse is output from the pulse number conversion means 19 every time. This pulse passes through the pulse weight selection means 20 and the pulse width shaping means 21, and is transmitted through the transmission pulse output circuit 9.

On the other hand, when the rotor 2 rotates in the opposite direction, as shown in FIG. 4B, the phase of the signal from the optical coupling element PI2 is always advanced, such as →→→→. The state transition of the two-phase signals from the optical coupling elements PI1 and PI2 is detected by the reverse rotation detection means 17b of the rotation direction detection means 17 of the central control circuit 7, and is counted every time one cycle of the transition of the two-phase signals is detected. The means 18 is decremented by -1.

That is, the counting means 18 of the central control circuit 7 adds the two-phase signals due to the forward rotation of the rotor 2 and subtracts the two-phase signals due to the reverse rotation of the rotor 2. Then, integration including both the rotation amount and the rotation direction element of the rotor 2 is performed, and the pulse number conversion means 19, the pulse weight selection means 20, according to a predetermined set value written in the constant memory circuit 8. Further, a signal having a predetermined oscillation constant and a signal format that has been arithmetically processed in the pulse width shaping means 21 is output as an oscillation pulse signal via the oscillation pulse output circuit 9.

As described above, the measured value of the watt-hour meter itself displayed on the mechanical metering display unit (36 in FIG. 7) of the watt-hour meter and the remote measured value of the electric power transmitted from the transmitter 6 are displayed. In the meantime, it is possible to prevent an error due to the reverse rotation of the rotor 2, and by configuring these in one chip with a semiconductor integrated circuit for arithmetic processing, the circuit of the transmitter 6 is simplified and The cost of the device 6 can be reduced.

In the above description, the case where the electric energy meter is provided with the reverse rotation prevention mechanism has been described. However, in the present invention, the central control circuit is rotated according to the rotation of the rotor 2 in both forward and reverse directions. Since the counting means 18 of 7 integrates positively or negatively, the present invention can be similarly applied to a watt hour meter without a reverse rotation prevention mechanism.

[0033]

[Effect of device]

 As described above, according to the present invention, the rotation for detecting the normal or reverse of the rotation direction of the rotor is detected from the phase relationship of the two-phase signals of the two sets of optical coupling elements generated by the rotation of the rotor of the electricity meter. The direction detecting means and the counting means for counting the measured value by adding the two-phase signals by detecting the forward rotation and subtracting the two-phase signals by detecting the reverse rotation are provided. Since the transmission pulse signal that is proportional to the net amount of rotation is output, it is necessary to eliminate the error between the measurement value on the measurement display of the watt-hour meter itself and the measurement value remotely measured via the transmission device. You can

[Brief description of drawings]

FIG. 1 is a block diagram of a transmitter of an electric energy meter with a transmitter, which is an embodiment of the present invention.

FIG. 2 is also a circuit diagram of the transmitter.

FIG. 3 is a diagram showing an optical coupling element and a signal disc for detecting a rotation amount and a rotation direction of a rotor.

FIG. 4 is a diagram showing output waveforms of two-phase signals from two sets of optical coupling elements.

FIG. 5 is a diagram showing a control function of a central control circuit as a block.

FIG. 6 is a diagram showing state transitions of two-phase signals from two sets of optical coupling elements in the optical coupling element circuit.

FIG. 7 is a diagram showing a configuration of a conventional watt hour meter.

FIG. 8 is a block diagram showing a structure of a known two-phase signal generator and a configuration of a conventional transmitter.

[Explanation of symbols]

1 Optical Coupling Element Circuit 2 Rotor 3 Rotating Shaft 4 Slit 5 Signal Disc 6 Transmitter 7 Central Control Circuit 8 Constant Storage Circuit 9 Transmission Pulse Output Circuit 10 Crystal Oscillation Circuit 11 Transmission Constant Input / Output Circuit 12 Power Failure Detection Circuit 13 Protection Circuit 14 voltage dividing circuit 15 rectifying circuit 16 constant voltage circuit 17 rotation direction detecting means 17a forward rotation detecting means 17b reverse rotation detecting means 18 counting means 19 pulse number converting means 20 pulse weight selecting means 21 pulse width shaping means t oscillation constant input terminal C1 , C2, C3, C4, C5, C6, C7, C8, C
9, C10 capacitor CN connector D1, D2, D3 diode IC1, IC2, IC3, IC4 semiconductor integrated circuit J jumper wire L filter coil O1, O2 output terminal P1, P2 power supply terminal PI1, PI2 optical coupling element PI1a, PI2a light emitting element PI1b , PI2b Light receiving element Q1, Q2 Transistor R1, R2, R3, R4, R5, R6, R7, R8 Resistance RY Relay SA Surge absorber XTAL Crystal oscillator ZD Zener diode

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Creator Toru Ishitoya 456-10 Imari, Kawagoe City, Saitama Prefecture

Claims (1)

[Scope of utility model registration request] 1. A signal disc having a plurality of slits, which is attached to a rotary shaft of a rotor of an electric energy meter and is arranged so as to rotate between a light emitting element and a light receiving element of two sets of optical coupling elements. , A transmission in which a two-phase signal is generated from the optical coupling element by rotation of the rotor, the two-phase signal is counted as a measurement value, and a transmission pulse signal is output for each predetermined measurement value according to a set predetermined transmission constant. In a watt-hour meter with a device, a rotation direction detecting means for detecting whether the rotation direction of the rotor is normal or reverse based on the phase relationship of the two-phase signals of the two sets of optical coupling elements, and the two-phase signal for detecting the normal rotation. An electric energy meter with a transmitting device, comprising: a counting unit that counts the measured value by adding and subtracting the two-phase signal by detecting reverse rotation.