JP2003153427A - Protection relay device and protection relay device central control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically inspect the characteristics of a protection relay device for controlling a circuit breaker based on a plurality of pieces of input information from a directional relay or the like. SOLUTION: In the protection relay device 1, a current component from a current transformer connected to a main circuit 22 and a voltage component from a transformer 23 connected similarly to the main circuit 22 are added to a logic arithmetic circuit 5, and the main circuit is protected by an output command obtained from it. The protection relaying device 1 comprises a signal generation means 12 for supplying an inspection current to the circuit of the current component to execute the automatic inspection of the protection characteristics, and a signal generation means 51 for supplying an inspection voltage to the circuit of the voltage component, thus controlling the output waveform and phase of each of the signal generation means 12 and 51 by the logic arithmetic circuit 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective relay device capable of automatically performing a characteristic inspection function of a protective relay device arranged in a power transmission and distribution system, and a centralized management system thereof. It is a thing.

[0002]

2. Description of the Related Art FIG. 6 is a block diagram showing a protective relay centralized control device disclosed in Japanese Patent Laid-Open No. 7-322470. In the figure, the protective relay 1 a is connected to the main circuit 22 via a current transformer 20. The protective relay 1a is an auxiliary current transformer 2 that inputs the output from the current transformer 20, an amplifier circuit 3 that amplifies the output of this auxiliary current transformer 2 and supplies it to the A / D conversion circuit 4, and an A / D conversion. Circuit 4, setting circuit 10 and memory circuit 1
1. A logical operation circuit 5 composed of a CPU or the like for processing the input from the circuit 1
9, an output circuit 6 for outputting a trip command 26, a display circuit 9 for displaying the output contents of the logical operation circuit 5, a signal generating means 12 (D / A conversion circuit) for supplying a simulated input to the amplification circuit 3 at the time of inspection, reception Communication means 1 comprising circuit 7 and transmitter circuit 8
Have three.

Next, the operation will be described. When a short circuit accident occurs in the main circuit 22 and a large current flows, the output of the current transformer 20 that detects this current is input to the A / D conversion circuit 4 via the auxiliary current transformer 2 and the amplification circuit 3. To be done. The logical operation circuit 5 is A
A logical operation is performed based on the output of the current transformer 20 converted into a digital signal by the / D conversion circuit 4 and the data read from the setting circuit 10 and the storage circuit 11, and the operation result is displayed on the display circuit 9. . When the input signal is a signal to open the circuit breaker 19, the logical operation circuit 5 outputs the trip command 26 to the output circuit 6 to open the circuit breaker 19. This separates the sound busbar area from the accident point.

The protective relay 1a of this example has a signal generating means 12 (D / A conversion circuit) for automatically performing characteristic inspection. The D / A conversion circuit 12 is responsive to a command signal from the logical operation circuit 5 to send an inspection signal (eg, set value × 300%, 500%,
It functions as a signal generating means for generating a current of 1000%) and supplying it to the amplifier circuit 3.

When the protective relay 1a carries out the characteristic inspection, the logical operation circuit 5 supplies the digital data based on the operating range data to the D / A conversion circuit 12. D / A conversion circuit 1
The output of 2 passes through the amplification circuit 3 and is converted again into digital data by the A / D conversion circuit 4. Based on this digital data, the logical operation circuit 5 determines whether or not set value ≦ input value. It is determined whether the elapsed time when the input value is the set value ≦ the input value is the operating time <the elapsed time with respect to the preset operating time, and when the operating time <the elapsed time, the output circuit is output to the circuit breaker 19. The trip command 26 is output from 6 and then it is judged whether or not there is a trip completion command 27 from the circuit breaker 19. The characteristic of the protective relay is inspected by calculating the operation time until the trip completion command 27 is received after generating the inspection signal and comparing it with the preset value of the predetermined operation time.

Further, the above characteristic confirmation is automatically performed from a distance by the centralized control device 14 connected by the receiving circuit 7 and the transmitting circuit 8, and the execution result is displayed on the display device 16 on the centralized control device 14 side, In addition, by storing the result in the memory circuit 18, automatic inspection of the protective relay can be efficiently performed. Reference numeral 15 is a control unit, and 17 is a keyboard unit.

[0007]

As described above, the conventional protection relay centralized control device has only a single signal generating means (D / A conversion circuit 12) and a plurality of inputs.
For example, it was impossible to carry out a characteristic inspection of a direction relay or the like having a direction determination function.

[0008]

A protective relay device according to the present invention comprises a current component from a current transformer connected to a main circuit,
Similarly, it is a protective relay device that applies the voltage component from the transformer connected to the main circuit to the logical operation circuit and protects the main circuit according to the output command obtained from it. In order to do so, a signal generating means for supplying an inspection current to the circuit for the current component and a signal generating means for supplying an inspection voltage to the circuit for the voltage component are provided, and the waveform and phase of the output of each of the signal generating means are The control is performed by the logical operation circuit.

A time measuring circuit for measuring the time from the start of the inspection command by the signal generating means to the confirmation of the completion of the inspection operation is independently provided outside the protective relay device.

The output of the signal generating means can be taken out of the protective relay device and monitored.

The logical operation circuit has a function of detecting or correcting an abnormality in the signal generating means and the input section by outputting an output signal having a predetermined value from the signal generating means. is there.

In the centralized management system for protective relay device according to the present invention, the protective relay device described above is provided with communication means for receiving an inspection command from the outside and transmitting an inspection result, and the communication means is provided with a transmission line. Through this, the centralized control device sends an inspection request command, and the inspection result can be received by the centralized control device.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. Hereinafter, a protective relay device according to Embodiment 1 of the present invention will be described with reference to the drawings. In FIG. 1, a protective relay device 1 has a function of a directional relay, and the conventional protective relay 1a shown in FIG. 6 is used.
, The transformer 23 connected to the main circuit 22, the main circuit 2
An auxiliary transformer 21 for inputting a voltage component of 2 via a transformer 23, an amplifier circuit 31 for amplifying the output of the auxiliary transformer 21,
An A / D conversion circuit 41 for converting the output of the amplification circuit 31 into a digital value and supplying it to the logical operation circuit 5, and a signal generation means 51 (D / A conversion circuit) for supplying a voltage for inspection to the amplification circuit 31 are added. It was done. Since other configurations are the same as those in FIG. 6, the description thereof will be omitted by giving the same reference numerals.

Next, the operation of the above device will be described. In the protective relay device 1 having the function of the directional relay, the logical operation circuit 5 determines the amplitude value of each waveform of the voltage component obtained by the auxiliary transformer 21 and the waveform of the current component obtained by the auxiliary current transformer 2. The phase value is monitored, and when the amplitude value and the phase value exceed the threshold value and the operation time value stored in the memory circuit 11, an output command is issued to drive the output circuit 6, and the trip command 26 causes the circuit breaker 19 to operate. Open up.

The logical operation circuit 5 of the protective relay device 1 according to the present embodiment has a storage circuit for the D / A conversion circuits 12 and 51, which are respective signal generating means, when performing the characteristic automatic inspection. The inspection signal stored in 11 is output. As a result, the waveform of the check current component supplied from the logic operation circuit 5 to the D / A conversion circuit 12 passes through the check current component circuit, that is, the amplification circuit 3 and the A / D conversion circuit 4, To reach. The waveform of the check voltage component supplied from the logical operation circuit 5 to the D / A conversion circuit 51 is sent to the logical operation circuit 5 via the circuit of the check voltage component, that is, the amplifier circuit 31 and the A / D conversion circuit 41. To reach. The logical operation circuit 5 is D /
It is possible to change the amplitude value and the phase value of the inspection signal given to the A conversion circuits 12 and 51. When the inspection current, the amplitude value, and the phase value of the inspection voltage that have reached the logic operation circuit 5 exceed the predetermined values and the duration time exceeds the predetermined value, the logic operation circuit 5 issues an output command. Accordingly, the circuit breaker 19 is opened by the trip command 26 from the output circuit 6. Then, the circuit breaker 19 issues a trip completion command 27.
Determine if there is. In the logical operation circuit 5, the operation time until the trip completion command 27 is received after the D / A conversion circuits 12 and 51 generate the inspection signal is calculated and compared with a predetermined value of the predetermined operation time. Confirm the characteristics of the protective relay with.

FIG. 5 shows a timing chart for confirming the characteristics. The logical operation circuit 5 sends the check signal to the D /
It is output from the A conversion circuits 12 and 51. The time from the generation of the inspection signal to the trip command 26 of the output circuit 6 is the operation time of the protective relay device 1, and the time from the trip command 26 of the output circuit 6 to the trip completion command 27 is the operation time of the circuit breaker 19. The sum of the two is the protective relay 1 and the circuit breaker 19
The total operating time is the combination. In addition, D / A conversion circuit 1
The inspection signal generated at 2, 51 may be stored in the storage circuit 11 in advance, or may be calculated by the logical operation circuit 5. Further, in the protective relay device including the circuit breaker control switch as the setting circuit 10, the operating time of the circuit breaker can be monitored by measuring the operating time from the opening control of the circuit breaker control command to the trip completion command 27. Becomes

Embodiment 2. In the first embodiment, the logical operation circuit 5 measures the time from the generation of the inspection signal to the trip command 26 of the output circuit 6 and the time from the trip command 26 of the output circuit 6 to the trip completion command 27. However, as shown in FIG. 2, by outputting the inspection start command 28 from the logic operation circuit 5 to the outside, the time measurement circuit 25 provided outside may perform the above-mentioned time measurement. .

With this configuration, the inspection start command 28, the trip command 26, and the trip completion command 27 are output to the outside, and the protective relay device 1 and the time measuring circuit 2 are provided.
It becomes easy to confirm the operation of item 5.

Embodiment 3. FIG. 3 is a diagram showing a third embodiment of the present invention. In the third embodiment, the outputs of the D / A conversion circuits 12 and 51, which are the signal generating means, are added to the circuit of the inspection current component and the circuit of the inspection voltage component, and at the same time taken out as the monitoring output 24. There is. As a result, the inspection current and inspection voltage can be easily confirmed on the monitoring output 24. Inspection start command 2 of the second embodiment according to the present embodiment
By adding 8, all the signals in FIG. 5 can be confirmed externally, so that it becomes easier to confirm the operation of the protective relay device.

Fourth Embodiment Next, a fourth embodiment of the invention will be described. In this embodiment, the logic operation circuit is provided with a function of detecting or correcting an abnormality in the signal generating means and the input section by outputting an output signal having a predetermined value from the signal generating means.

Prior to the characteristic inspection, the D /
By outputting a specified signal from the A conversion circuits 12 and 51, D
The logical operation circuit 5 performs the function confirmation and compensation of the / A conversion circuits 12 and 51, the amplification circuits 3 and 31 and the A / D conversion circuits 4 and 41. The D / A conversion circuits 12 and 51 combine and output predetermined DC potentials, and the logical operation circuit 5 outputs them.
By comparing with the outputs of the A / D conversion circuits 4 and 41, the zero level deviation in the signal path formed by the D / A conversion circuits 12 and 51, the amplification circuits 3 and 31 and the A / D conversion circuits 4 and 41 and The amplification deviation can be confirmed. When this deviation is large, it is possible to output an alarm to the outside. Also, the digital data is corrected by this deviation, and the D / A conversion circuit 1
2, 51 can be compensated or the digital data after the A / D conversion circuit can be compensated.

Embodiment 5. FIG. 4 is a diagram showing a fifth embodiment of the present invention. In the present embodiment, the logical operation circuit 5 of one or more protective relay devices 1 is connected to the centralized control device 14 via the communication means 13 including the receiving circuit 7 and the transmitting circuit 8 and the transmission path. There is. The centralized control device 14 sends an automatic inspection start command to the desired protective relay device via the transmission circuit 8. The logical operation circuit 5 of the protective relay device 1 receives this command via the receiving circuit 7, performs characteristic inspection, and sends the result via the transmitting circuit 8. The centralized control device 14 receives the present execution result by the receiving circuit 7, displays the execution result on the display device 16 via the control unit 15,
In addition, by storing the result in the storage circuit 18, automatic inspection of the protective relay device can be efficiently performed. In addition, 17 is a keyboard part.

At this time, the automatic inspection start command may include information such as amplitude information, phase information, threshold value, operation time, etc. generated in the D / A conversion circuits 12 and 51 which are signal generating means. The control device 14 enables more detailed automatic characteristic inspection of the protective relay device 1.

[0024]

According to the present invention, a plurality of signal generating means (D / A conversion circuit) for generating the inspection signal of the protective relay device are provided, and the waveform and the phase of each of them are controlled so that the directional relay can be controlled. Automatic inspection is possible.

Further, the inspection start command, the trip command, and the trip completion command are output to the outside, which facilitates the operation confirmation of the protective relay device and the time measuring circuit.

Further, by adding the inspection start command 28, all the signals shown in FIG. 5 can be confirmed externally, so that it becomes easy to confirm the operation of the protective relay.

Further, by outputting an output signal of a predetermined value from the signal generating means, it is possible to detect or correct the abnormality of the signal generating means and the input section, and to realize a highly reliable protective relay device. .

Further, the centralized control device enables centralized management of a plurality of protective relay devices, and at the same time, the inspection signal at the time of characteristic inspection for each protective relay device can be designated to make the automatic inspection more detailed. Can be implemented.

[Brief description of drawings]

FIG. 1 is a block diagram showing a protective relay device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a protective relay device according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing a protective relay device according to a third embodiment of the present invention.

FIG. 4 is a block diagram showing a centralized management system for protective relay devices according to Embodiment 5 of the present invention.

FIG. 5 is a timing chart of characteristic inspection according to the present invention.

FIG. 6 is a block diagram showing a conventional protective relay having a characteristic inspection function.

[Explanation of symbols]

1 protection relay device, 2 auxiliary current transformer, 3 amplification circuit, 4 A / D conversion circuit, 5 logical operation circuit, 6 output circuit, 7 reception circuit, 8 transmission circuit, 9 display circuit, 10 setting circuit, 11 memory Circuit, 12
D / A conversion circuit (signal generation means), 13 communication means,
14 centralized control devices, 15 control units,
16 display device, 17 keyboard part, 18 memory circuit, 19 circuit breaker, 20 current transformer, 21 auxiliary transformer, 22 main circuit, 23 transformer, 24 monitoring output, 25
Time measurement circuit, 26 Trip command,
27 Trip complete command, 28 Test start command, 31 Amplification circuit, 41 A /
D conversion circuit, 51 D / A conversion circuit (signal generation means).

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Satoru Sasakawa             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. F-term (reference) 5G042 FF02 FF10 FF24 FF26 FF32

Claims (5)

[Claims] 1. A current component from a current transformer connected to the main circuit and a voltage component from a transformer also connected to the main circuit are added to a logical operation circuit, and an output command obtained from the logical operation circuit is used. A protective relay device for protecting the main circuit, comprising signal generating means for supplying an inspection current to the current component circuit, and signal generating means for supplying an inspection voltage to the voltage component circuit, A protective relay device characterized in that the protective characteristic of the protective relay device is automatically inspected by controlling the waveform and phase of the output of each signal generating means by the logical operation circuit. 2. The time measuring circuit for measuring the time from the start of the inspection command by the signal generating means to the confirmation of the completion of the inspection operation is independently provided outside the protective relay device. Protective relay device. 3. The protective relay device according to claim 1, wherein the output of the signal generating means is taken out of the protective relay device and can be monitored. 4. The logical operation circuit is provided with a function of detecting or correcting an abnormality in the signal generating means and the input section by outputting an output signal having a predetermined value from the signal generating means. The protective relay device according to any one of claims 1 to 3, which is characterized. 5. The protective relay device according to claim 1, further comprising communication means for receiving an inspection command from the outside and transmitting an inspection result, and transmitting to the communication means. Centralized control system for protective relay device, characterized in that an inspection request command is sent from a centralized control unit through a route and the inspection result can be received by the centralized control unit.