JPH07322470A - Protective relay centralized controller - Google Patents

Abstract

PURPOSE:To enable a user to manage the inspection result en block with a centralized controller, performing the execution of the inspection of operation of a plurality of protective relays and a breaker arranged in a power distribution line by the command from the centralized controller. CONSTITUTION:Many protective relays, which receive the inspection command from outside and perform self inspection, and a centralized controller 7, which selectively outputs an inspection command to each protective relay 1, are connected by a transmission path 8 through a transmitter-receiver 21 and 75 that each has, and the protective relay 1 is provided with a current generation source 20 which outputs different inspection currents, and the centralized controller 7 is equipped with a display which indicates the inspection results of the protective relay 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective relay centralized control device for controlling inspection of a large number of protective relays arranged in a power transmission and distribution system.

[0002]

2. Description of the Related Art FIG. 5 is a single-line diagram showing a general power distribution system. F is a primary substation connected to a power plant (not shown) via a power transmission line, and S is the primary substation. Secondary substation connected to F, 1a is a protective relay, 2 is primary and secondary substation F,
Circuit breaker provided on line W in S, 3 is line (transmission and distribution system)
It is a current transformer arranged in W, and the output of each current transformer 3 is supplied to the protective relay 1a. 4 is an extra high voltage transformer provided on the line W of the primary substation F, 5 is a high voltage transformer provided on the line W of the secondary substation S, and 6 is a motor that receives power from the secondary substation F.

FIG. 6 is a block diagram showing the structure of the protective relay 1a. The auxiliary current transformer 11 receives the output from the current transformer 3, and the output of the auxiliary current transformer 11 is amplified to A / D.
Amplifier 12 supplied to conversion circuit 13, A / D conversion circuit 1
3, a logical operation circuit 16 such as a CPU that logically inputs the inputs from the setting circuit 14 and the storage circuit 15, an output device 17 that receives the output of the logical operation circuit 16 and outputs a trip command to the circuit breaker 2, the logical operation circuit It has a display device 18 for displaying the output contents of 16 and a simulation input circuit 19 for supplying simulation input to the amplifier 12 at the time of inspection.

Next, the operation will be described. When a large current flows due to a short-circuit accident or the like on the bus W, the output of the current transformer 3 that detects this current is input to the A / D conversion circuit 13 via the auxiliary current transformer 11 and the amplifier 12. . The logical operation circuit 16 performs a logical operation based on the output of the current transformer 3 converted into a digital signal by the A / D conversion circuit 13 and the data read from the setting circuit 14 and the storage circuit 15, and displays the operation result. It is displayed on the device 18 and supplied to the output device 17. When the input signal is a signal for opening the circuit breaker 2, the output device 17 outputs a trip command to output the circuit breaker 2
To disconnect the sound busbar area from the accident point.

When inspecting the protective relay 1a which performs such an operation, an inspection input corresponding to the detection input from the current transformer 3 is input from the simulated input circuit 19 to the amplifier 12, and the protective relay 1a is operated as described above. And perform inspection. In this case, the output from the simulated input circuit 19 is a fixed value,
For example, an overcurrent relay, set value for maintenance and inspection x 3
Regardless of the fact that the current value of 00, 500, 1000% is passed, the amplifier 1
It is input to 2.

[0006]

Since the conventional protective relay is constructed as described above, it is not possible to collectively manage the inspection results of the protective relays. Also,
The inspection input to be input to each protective relay is constant, and there is a problem that the time delay characteristics cannot be inspected.

The invention as set forth in claim 1 has been made to solve the above-mentioned problems, and an object thereof is to make it possible to perform inspection of each protective relay and centrally manage the inspection result.

An object of the present invention is to make it possible to check the time delay characteristic.

It is an object of the invention according to claim 3 to display the inspection status of each protection relay that is centrally managed.

[0010]

A centralized control device for a protective relay according to the present invention is arranged in a power transmission and distribution system,
A transmission / reception unit of a protective relay that receives an inspection command from the outside and performs self-inspection, and a transmission / reception unit of a centralized control device that selectively outputs an inspection command to the protection relay are connected via a transmission line. .

According to a second aspect of the present invention, there is provided a protective relay centralized control device, wherein the protective relay is provided with a current generation source for outputting different inspection currents based on the received inspection command.

According to a third aspect of the present invention, there is provided a centralized control device for a protective relay, wherein the centralized control device is provided with a display device for displaying an inspection result of the protective relay.

[0013]

The central control device according to the invention of claim 1 is
It is possible to output an inspection command to the protective relay via the transmission line, input the inspection result of this protective relay via the transmission line, and collectively manage the inspection results.

According to the second aspect of the invention, the protective relay can self-inspect the time delay characteristic by outputting different inspection currents from the current generation source based on the received inspection command.

The central control device according to the third aspect of the present invention is provided with the display device for displaying the inspection result of the protective relay, so that the operation of the circuit breaker and the abnormality of the protective relay at the time of inspection can be easily and quickly performed. You can check.

[0016]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a single line diagram showing a general power receiving / distributing system to which the protective relay central control device of the present invention is applied. The same parts as those of the single line diagram shown in FIG. To do. In FIG. 1, reference numeral 7 denotes a centralized control device 7 as a master station, and the centralized control device 7 is connected to each protective relay 1 as a slave station via a transmission line 8.

FIG. 2 is a block diagram showing the configuration of the protective relay 1 and the centralized control device 7. The protective relay 1 is a D / A conversion circuit instead of the simulated input circuit 19 of the conventional protective relay 1a shown in FIG. A (current source) 20 is provided. The D / A conversion circuit 20 generates a current of settling value × 300%, 500%, 1000% which is regulated to flow at the time of maintenance and supply to the amplifier 12 according to a command signal from the logical operation circuit 16. Acts as a source.

The centralized control unit 7 stores a control unit 71 including a microcomputer, a keyboard unit 72 for inputting necessary data to the control unit 71, a processing result from the control unit 71, and outputs the stored data to the control unit 71. It has a memory circuit 73 for controlling and a display device 74 for displaying the processing result from the control unit 71. The protective relay 1 and the centralized control device 7 are provided with transmitting / receiving units 21 and 75, respectively, and are connected to each other via a transmission line 8 via the transmitting / receiving units 21 and 75.

Next, the operation of the above embodiment will be described.
First, the centralized control unit 7 selects a protective relay to be inspected in the control unit 71 based on the data input from the keyboard unit 72, selects which element is to be inspected by the selected protective relay, and performs inspection. The execution command is sent from the transmitter 75a to the protective relay 1 via the transmission line 8.

When the protective relay 1 receives the above-mentioned inspection execution command at the receiving portion 21b, it carries out a series of inspection operations shown in the flowchart of FIG. First, when the inspection operation starts, it is determined in step ST3-1 whether or not it is an inspection execution command for itself, and if NO, the inspection operation is not performed.
If YES, the process proceeds to step ST3-2 and D / A
Set value x 300%, 500%, 100 from conversion circuit 20
The operating range data of 0% is output to the amplifier 12. This operating range data is set to 300 by the setting circuit 14 which is a selection switch.
%, 500%, 1000% are set, the setting data is read from the memory circuit 15 stored in advance to the logical operation circuit 16, and the D / A is output by the output of the logical operation circuit 16 based on the read setting data. It is made by the conversion circuit 20.

When the logical operation circuit 16 inputs the output of the amplifier 12 based on the operating range data through the A / D conversion circuit 13, the input value is set value ≦ input value or is output to the D / A conversion circuit 20. Then, whether the input time from the reception of the output from the A / D conversion circuit 13 is the preset operation time ≦ the input time or not is determined in steps ST3-3 and ST, respectively.
It is determined in 3-4, and if NO, the process returns to step ST3-2 and moves to YES in step ST3-5.

In step ST3-5, a trip command is output from the output circuit 17 to the circuit breaker 2, and then it is determined in step ST3-6 whether there is a trip completion command from the circuit breaker 2. If YES, the operation time from step ST3-3 to step ST3-6 is calculated and displayed on the display device 18 (step ST3-7), and if NO, an abnormality of the circuit breaker 2 is output (step ST3-). 8). Then, in step ST3-9, the above step ST3
The operation time data from -7 and the abnormal data of the circuit breaker 2 from step ST3-8 are transmitted from the transmission unit 21a to the centralized control device 7 via the transmission line 8 to complete the inspection operation. The operation time is calculated, for example, by a counter (not shown) provided in the logical operation circuit 16 to count clock pulses from the start of the operation.

As a result, in the centralized control device 7, the data transmitted from the protective relay 1 is input to the control part 71 through the receiving part 75b, and the necessary data is stored in the memory circuit 73 and displayed on the display device 74. , Manage the inspection results of protection relay 1 collectively.

Example 2. FIG. 4 is a flow chart showing the operation when a failure occurs during normal operation. Now, a short circuit accident has occurred on the line W, etc., and the current transformer 3 and the auxiliary current transformer 1
If there is an input via 1, it is determined whether the input values are set value ≦ input value and operation time ≦ input time in steps ST4-1, 4-
If both are YES, step ST4-
3, the output circuit 17 outputs a trip command to the circuit breaker 2. The operating time is the time from when the protective relay receives the input signal until it outputs the trip signal, and the input time is the time from when the protective relay receives the input signal set in advance and before the trip signal is output. Then, in step ST4-4, it is determined whether or not there is a trip completion command from the circuit breaker 2, and if YES, step ST4-1.
To the step ST4-4 are calculated and displayed on the display device 18 (step ST4-5), and if NO, an abnormality of the circuit breaker 2 is output (step ST4-6).
Then, in step ST4-7, the above step S
The operation time data from T4-5 and the abnormal data of the circuit breaker 2 from step ST4-6 are transmitted from the transmission unit 21a to the transmission line 8
To the centralized control device 7 through the, and the operation ends.

As a result, in the centralized control device 7, as shown in FIG.
The data sent from the protective relay 1 can be stored in the storage circuit 73 and displayed on the display device 74 in the same manner as the inspection shown in (1), and the operating status of the protective relay 1 can be known.

[0026]

As described above, according to the first aspect of the present invention, the transmission / reception unit of the protective relay as the slave station and the transmission / reception unit of the centralized control device as the master station arranged in the power transmission / distribution system are provided. Since it is configured to be connected by a transmission line, the centralized control device can output an inspection command to the protective relay and receive the inspection result from the protective relay, and the operation status of multiple protective relays can be collectively received. There is an effect that can be managed.

According to the second aspect of the present invention, since the protection relay is provided with the current generation sources for outputting different inspection currents, even a protection relay having a time delay characteristic can be inspected including the operating time. There is an effect that can be implemented.

According to the third aspect of the present invention, since the central control unit is provided with the display unit, the operation of the circuit breaker and the presence / absence of abnormality of the protective relay at the time of inspection according to a command from the central control unit can be simplified. And there is an effect that can be confirmed quickly.

[Brief description of drawings]

FIG. 1 is a single line diagram showing a power distribution system to which a protective relay centralized control device according to an embodiment of the present invention is applied.

FIG. 2 is a block diagram showing a configuration of a protective relay and a centralized control device.

FIG. 3 is a flowchart illustrating an operation in inspection.

FIG. 4 is a flowchart illustrating an operation when a failure occurs.

FIG. 5 is a single line diagram showing a conventional general power receiving / distributing system.

FIG. 6 is a block diagram showing a configuration of a conventional protective relay.

[Explanation of symbols]

1 protective relay, 2 centralized control devices, 8 transmission lines, 20
D / A conversion circuit (current generation source), 21 transceiver unit, 7
4 display device, 75 transmitter / receiver, W line (power transmission / distribution system).

Claims (3)

[Claims] 1. A large number of protective relays arranged in a power transmission and distribution system for receiving self-inspection by receiving an inspection command from the outside, and a centralized control device for selectively outputting the inspection command to each of the protection relays. A protective relay centralized management device comprising: a transmission line that connects the transmission / reception unit of each protection relay and the transmission / reception unit of the centralized control device. 2. The centralized control device for protective relay according to claim 1, wherein the protective relay includes a current generation source that outputs different inspection currents based on the received inspection command. 3. The centralized control device for protective relay according to claim 1, wherein the centralized control device includes a display device for displaying an inspection result of the protective relay.