JPS59103518A - Protecting relaying device for annular wire system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to
The present invention relates to a protective relay device that controls.

FIG. 1 shows the configuration of a conventional protection relay device for a line system.

The illustrated example is a case of 4 consumers, where the power substation T and the 4 consumers are connected to the bus 1 of ~D4 in a loop shape by the transmission line 2. The system is divided into 5 sections. (Pilot wire) Relay (for short circuit).

(for ground faults) 3. in this case,
Substation T is equipped with relays ``a'' (4 undervoltage relays and ground fault overvoltage relays) 4 for accident detection.
is the circuit breaker, 6 is each demand balance, -D.

It is a transformer.

FIG. 2 shows the trip sequence of the protective relay device configured as described above. In the event of a short-circuit accident, when both the contact 4S of the undervoltage relay of the fault detection relay 4 and the short-circuit protection output contact 3B of the display line relay 3 are closed, Further, in the event of a ground fault, the tripping coil TO is energized when both the ground fault overvoltage relay contact 4G of the fault detection relay 4 and the ground fault protection output contact 3G of the indicator line relay 3 are closed.

As mentioned above, the conventional protective relay device has the following
have points.

0) Protection relay equipment from the supply side (generally Denkokusha) is installed in parallel with the power receiving equipment of consumers D1 to D4, so maintenance and operation of the protection equipment will be difficult. , praise a lot of effort.

(2) As the performance of protective relays becomes limited due to system changes and operational changes, it is necessary to add limits to consumer equipment and system capacity.

G) Increase in underground substations, installation of 1m small substations, etc.
There is also a demand for downsizing protective relay devices, but it is difficult to downsize conventional types due to their mechanical structure.

(4) Setting variable power function, failure record control display function.

There is no flexibility regarding measurement functions, etc.

The purpose of the present invention is to solve the above-mentioned problems and provide a protective relay device for a wire line system that is easy to maintain, periodically inspect, operate, and change, and can be downsized. will be described in detail based on illustrated embodiments. .

Fig. 3 shows an embodiment of the present invention, in which 1 is the bus line of the customer -D, 2 is the transmission line connecting the bus 1 of the customer ~D4 and the substation T in a loop. Electric wire, 5, breaker, 6
is a transformer, 7 is a slave station installed at each consumer station -D, 8 is a transmission line, for example, a cable from a carrier pair, and 9 is a master station installed at a certain point, for example, substation T. It is.

The transmission line 8 is for connecting the master station device 9 and each slave station device 7.

In addition, upstream means OT information (R・T
, O phase) and information on the circuit breaker 5 are transmitted from each slave station device 7 to the master station device 9. Further, the downlink is the protection output result processed by the master station device 9 or the breaker 5 trip command of each customer R1 to D4, and is transmitted from the master station device 9 to the skeleton station device 7. In this embodiment, since the master station device t9 and the slave station devices 1f7-1 to 1f7-4 are radially connected to each other for uplink and downlink +W signals, there is a one-to-one correspondence.

The slave station device 7 includes at least a detection section that detects the current at its installation point and converts it from analog to digital; - an output section that provides an operation command signal to the circuit breaker 5; and a transmission section that performs all information exchange. have

Further, the master station device 9 is configured as shown in FIG. 4. That is, an electrical-to-optical converter (911m).

912A, 911B, 912B), optical-electrical converter (
98LA, g22mu.

921B, 922B), transmission interface circuit 9
3. Input conversion circuit 94 for transmitting end current/bus voltage information of substation T, circuit 10 (input/output) for issuing circuit breaker trip commands
Circuit 95. Processing circuit (microcomputer) that realizes the functions of the main detection relay (short circuit indicating line relay, ground fault indicating line relay) and fault detection JJ Schiller undervoltage relay, ground fault overvoltage relay) through digital processing.In the case of a 96° double loop system. The transfer cutoff command generation means 97 and the like are configured. The ink face circuit 93. Input conversion circuit 9
4. VO circuit 95. The processing circuit 96 is connected via a data bus, and the transmission interface circuit 93 is connected via an optical fiber cable, each optical-to-electrical conversion circuit, and an electric-to-electrical conversion circuit.
It is connected to the transmission line 8 via an optical conversion circuit.

FIG. 5 shows a protection processing method for the master station device 9. Unlike the conventional OT cross-connection method shown in FIG. 1, the OT information of each customer is transmitted to the master station device. , O
It is a T-non-connection method. Separate the protection of the lines 2-1 to 2-5 and the protection of the bus lines 1-1 to 1-4 of each customer,
If each of the line protection relays 10-1 to 'to-5 and the busbar protection saws 11-1 to 11-4 are used, then the result is K. As a result, protection sensitivity is significantly improved.

Note that 12 is an accident detection section.

Next, the operation will be described. OT of each consumer D1 to D4
The information and circuit breaker information are transmitted to the master station device 9 through transmission #8, and are transferred to the electrical-to-optical converters (911A, 911B>, 911B).

Fiber optic cable, optical-to-electrical converter (921A.

921B) is input to the microcomputer 96 through the transmission interface circuit 93 (upper information).

Further, the transmission end current of the substation T and the bus lIJ voltage are input to the microcomputer 96 through the input conversion circuit 94. The microcomputer 96 uses these inputs to perform protection processing (main detection) as shown in FIG.

(fault detection), and a part of the result is outputted from the engineering 10 circuit 95 as a substation breaker trip command, or in the case of a double loop system, a transfer cutoff command for other loops. In addition, other results are sent to the transmission line 8 via the transmission interface circuit 93, the air-to-air optical converters 912A, 912B), the optical fiber cable, the optical-to-electrical converters (922A, 922B), and further This transmission line 8 is passed through and transmitted to each customer as a breaker trip command (information below)
.

6 to 10 show other embodiments of the present invention.

FIG. 6 has approximately the same configuration as FIG. 4, but in this case, a processing circuit (microphone computer) 96 is in charge of the main detection relay function, and a separate processing circuit 9 is responsible for the accident detection relay function.
8 is in charge. This processing circuit 98 includes a fault relay circuit 98-1 and a substation bus bar pressure input conversion circuit 98-1.
2. The output of Frozen ■10L2J path 95 is the AND output of the main detection relay and the accident detection relay.

Incidentally, the upstream 1'n information is the same as in the previous embodiment, but the downstream information is the output of the logic 4 of the main detection relay and the accident detection relay. Also, the fault detection circuit 98 may be left in the conventional relay.

In this way, when the functions of the main detection relay and the accident detection relay are processed by separate means, the reliability of the relay is improved.

Each of the above embodiments is a case of a radial transmission path, but as shown in FIG. It can also be applied to the case of transmitting/receiving via a transmission path, and in that case, the master station device 9 is adapted to the flow between the interface circuit 93 and the converters 912A*912B, 921a, 921B in FIGS. 41 and 6. becomes like a dotted line arrow, and accordingly, electric-to-optical converters 911A, 912B and optical-to-electrical converter 921A are connected.

922B is replaced.

FIG. 8 shows that upstream information of each support W-Dt to p4 is transmitted from each slave station device 7 to one master station device 9 using radial transmission paths between clockwise and counterclockwise directions, and downstream information is This is a case where transmission is performed using clockwise and counterclockwise loop-shaped transmission paths, and the configuration of the master station device in this case is shown in FIG.

The left-handed uplink information and counterclockwise downlink information of each customer are transmitted to the master station device 19 through the cable 8-1. In the master station device 9, the same processing as in the case of FIG. 4 is performed. The protection processing results are a substation disconnection connection 0 equipment trip command, a transfer cutoff command, and downlink information. Downlink information is cable 8-1
is transmitted to each customer as a trip command for the circuit breaker (A system).

The same operation applies to the ll'iB system. and,
In the slave station device, the sum of each downlink information of the A system and the B system or the cooking error is taken as the final trip signal.

In addition, the auxiliary relay of the substation breaker trip command tiA system
+1 * X11 and B series auxiliary relay xtt s ”H
It is the logical product output.

Figure 10 shows the case where transfer interruption is necessary, 9A
e9B is the master station device for the A loop and the O loop. When the master station device 9 A # 9 B receives a transfer cutoff command 100A or 100B from the master station device of another loop, it sends the signal to the cable 8 as part of the transmission information.
-1, 8-4'c to be transmitted to the skeleton station equipment.

Transfer block commands are required in the following cases:

Accident at point a...0-1 Transfer cutoff signal 100A
Accident at point b...0-2 Transfer cutoff signal 100A
C point accident...0-3 Transfer cutoff signal 100
Bd point accident...0-4 Transfer cutoff signal 100
B As described above, the iJ line system maintenance device according to the present invention has a detection unit that detects all drowsy conditions, and an output that provides a week moe trap operation command signal to the loop line system valley demand generator. At the same time, a slave station device is installed as the minimum necessary component of the transmission section that sends and receives transmission information, and a radial transmission path or loop-shaped transmission path is formed by each slave station device and the transmission line. The following advantages arise by arranging all the master station devices that concentrate information in one place and make catch determinations at a specific point, for example, at a tonkime location.

0) Easy maintenance and periodic inspection By giving inspection commands from the master station to the slave stations using downlink information, the entire system can be inspected automatically, eliminating the need for people to go to the slave stations, reducing labor. Reduced.

(2) It is easy to operate and change the maintenance IJ relay by changing only the software of the master station device.

(3) Improved back-up protection function Since a wider range of differentials can be assembled compared to the conventional type, the back-up protection function can be improved (for example, in Figure 2, the main Yato It constitutes a relay, but as a backup, it is easy to protect the track 2 over a wider area, such as two or three sections).

(4) Downsizing of the slave station device Since the detection section, output section, and transmission section of the slave station are small electronic circuits, the device can be downsized and can be applied to compact substations and the like.

(5) It is possible to change the stability, record failures, and display measurements and controls.The master station device collects all the detection data of each slave station, and the slave stations also have breaker control information and redundancy value information. can be transmitted, various functions can be added.

(6) Improving the reliability of protection The two-line configuration of the transmission system improves the reliability of transmission, and also improves the protection sensitivity due to the non-cross-connected sampling system.

[Brief explanation of drawings]

Fig. 1 is a system configuration diagram showing an example of a conventional protective relay device for a loop line system, and Fig. 2 is a system configuration diagram showing an example of a conventional protective relay device.
3 is a system configuration diagram showing one embodiment of the present invention, FIG. 4 is a block diagram of a master station device in the same embodiment, and FIG. 5 is a protection system of the master station device in the same embodiment. The system configuration diagrams shown in FIGS. 6 to 1410 are configuration diagrams showing other embodiments of the present invention. DESCRIPTION OF SYMBOLS 1...Bus line of demand bulb, 2...Oxygen line, 5...Shinbreaker, 6...Transformer, 7...Slave station device, 8...Transmission line, 9... Master station device, 93...Transmission interface circuit, 94...Input conversion circuit, 95...X10 circuit, %
...processing circuit (microcomputer), 98...
Processing circuit for accident detection.

Claims (5)

[Claims] (1) A slave station that has a detection unit that detects the current at at least the valley demand point of the loop system and converts it from analog to digital, an output unit that provides an operation command signal to the cutoff unit, and a transmission unit that exchanges information. Each device is installed 10,000 times, and each slave station device is connected radially or in a loop with a transmission cable, and the current from each slave station device, circuit breaker information, substation transmission end current, bus bar rolling pressure, etc. A predetermined protection judgment operation is performed from the received information and command information to the slave station device and 'T unit trip command information for power discontinuity/connection are obtained! The master station device IT that creates the I& is installed in the substation (f- A protective relay device for a loop system characterized by: (2) Claim 1, in which the functions of the main detection relay and the accident detection relay are provided as a master station device that obtains information through batch processing of information.
Protective relay device for the ring system as described in . (3) Claim 1, which is a master station device that obtains the functions of the main detection relay and the accident detection relay by separate processing means.
Protective relay device for the ring system as described in . (4) Radial transmission path in both directions, clockwise for up and counterclockwise;
The downlink is a loop-shaped transmission line in both clockwise and counterclockwise directions.
A protective relay device for a loop system according to claim 1, wherein the protection relay device is a master station device that performs protection processing for clockwise and counterclockwise systems using separate processing means. (5) The protection relay of the line system according to claim 1, wherein the master station device has means for generating a transfer cutoff command and transmitting the master station of the partner loop as downlink information to the slave station device. Electrical equipment.