JPS58186332A - Method of discriminating wiring line defect zone - 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 relates to a method for determining an accident section of a distribution line, which uses a remote monitoring system for distribution line equipment based on a distribution line transport method using the distribution line as a signal transmission path. This is to determine the

Figure 1 shows a remote monitoring and control system for distribution line equipment using distribution line transportation, and 1 is a power company service center (
It is a solid device of a remote monitoring device installed in a business office, for example, and centrally monitors and controls power distribution line equipment. 2a to 2C are main transformers of the substations, and are provided in separate substations. 3 is a distribution bus, 4 is a distribution line, 6 is a switch for the distribution line, 6 is a current transformer for measuring the current of each distribution line, 7a to 7C are connected to the distribution bus 3 from the substation to the equipment on each distribution line. A function to inject a carrier signal from the downstream side, a function to receive a carrier signal from the upstream side from the slave station 8 to the distribution bus 3 of the substation via the current transformer 6, and a function to transfer the signal to the solid equipment 1. It is a tortoise relay device that has the function of performing y and υ removal, and is connected to the solid device 1 by a dedicated communication line 9. The slave station 8 is connected to the power distribution equipment to be monitored and controlled that is distributed throughout the power distribution system, and has the function of receiving a downstream carrier signal and transmitting the received results to an upper carrier signal, that is, an answer.
It has the function of sending signals back to the substation. Further, the answer signal is transmitted to the solid equipment 1 through the relay device, and various information on the power distribution system is centrally monitored by the solid equipment 1. That is, transmission is performed between the relay device and the slave station 8 using distribution line transport. In this system, the transmission between the solid equipment 1 and the relay equipment is transmitted using a 1200B, P, and S (baud) modem, and the downlink signal carried by the distribution line is 210H.
The signal transmission speed is 20B, P, S using frequency shift keying (FSK) of 10Hz and is transmitted as a voltage signal. The upstream signal of the distribution line is 4soiiz 15Hz
It is transmitted as a 3oB, P, S current signal with FSK. The selection of the carrier frequency and the explanation of why voltage signals and current signals are used are not the main point of the present invention, and will therefore be omitted here.

Figure 2 shows part of the current power distribution system, where 10 is the main transformer for power distribution, 11 is the power distribution bus, and 12 is the circuit breaker 1.
3 to the distribution bus 11, and switches 14a to
Distribution line 14d is divided into sections, 15a to 1sd are pole transformers for control, and switch controllers 16a to 1
Used to power ED. Controller 16a for this switch
16d has the function of opening the switch when the power supply of the control pole transformer becomes non-voltage, and opening the switch 7 seconds after the power supply of the pole transformer is charged, and also opens the switch. The transformer has a closing lock mechanism that permanently prevents the switch from closing if the voltage of the transformer becomes non-voltage within 7 seconds after the transformer is charged. When the locking mechanism is released, the switch can be turned on.

Next, an example of the current accident zone determination will be explained. First, switch 1
A case where an accident occurs between 4C and switch 14d will be explained. When an accident occurs, an overcurrent relay, a ground fault relay, etc. for the distribution line of the substation are activated, and the circuit breaker 13 is opened. Then, the power distribution line 12 becomes voltageless. Therefore, all switches 146 to 14d are opened. The circuit breaker 13 was closed one minute after the accident was detected, and thereafter the circuit breaker 14a was closed at 7 second intervals.
.

When the switches 14b and 14C are turned on and the switch 14C is turned on, the circuit breaker 13 is opened and closed again due to an accident in the section of the switches 140 to 14d, and the switch 14G is locked. The fault zone is determined by measuring the time from when the circuit breaker 13 is closed again until it is shut off again. In this example, since the time is from 21 seconds to 28 seconds when the fourth section is introduced, it is determined that the accident occurred between 148 and 14d.

Once the accident area has been determined, the information is communicated to the service center by telephone or other means.

The present invention adds the function of a slave station for carrying distribution lines to the controllers 168 to 1ed for switchgear in addition to the original functions of the controller, so that the fault section can be determined with a solid device. .

FIG. 3 shows a block diagram of the controller of the present invention.

17 is a power distribution line, 18 is a pole transformer for control, and 19 is a secondary side of the pole transformer 18 with a low voltage of 100 V or 200 V. 20 is 210H110) 1z's 20B, P,
8, the part that receives the downstream carrier signal, 22 is 450Hz
A part 23 that creates uplink carrier signals of 15 Hz aoB, P, and 8 is a coupling circuit part that amplifies the uplink carrier signals and injects the signals into the distribution line 17. Reference numeral 21 is a control circuit section which has the functions of switch controllers 16a to 16d, and judges the signals 20B, P, and 8 demodulated by the downstream carrier signal receiving section 2o, and as a result of the judgment, the set child If it matches the station number, issue a closing, opening command, lock release command, etc. to the switch through 24, and
6 to the upstream carrier signal generation unit 22.
, an upstream answer signal is injected into the distribution line through the coupling circuit section 23. Here, a function is added to the control circuit unit 21 to transmit a signal of 450 Hz + 16 Hz for 5 seconds as an emergency signal when the power is restored. At the substation, this 450
Signals of Hz-1-1 esHz are received one after another and sent to a solid device 1 installed at a business office. In solid device 1, this 450
A 6-second signal of Hz -1-15Hz is received, and the accident area is determined based on the number of signals during that 6-second period.

The details will be explained based on FIG. 4. 26 in Figure 4
indicates the operating state of the circuit breaker 13 of the distribution line 12. L opens,
When H is closed and just before it becomes L, it is the time when an accident is detected.

27 is the control transformer 15a, 28 is the control transformer 16b
, 29 indicate the state in which the control transformer 15C is charged.

H is the charging time. 30 is a control transformer 15d
is charged, but since there is an accident in the section between the switches 14c and 14d, the circuit breaker 13 is opened, and each control transformer becomes uncharged again. 31 to 34 show how the control transformer of the slave station in FIG. 3 is charged and the signal is injected into the distribution line for 5 seconds through the transformers 15a to 1esd. 34, the circuit breaker 13 is immediately shut off, so the answer signal does not continue for 5 seconds. In the solid device 1, the section of the fault can be determined by the 6-second answer signal, and the distribution line base can be known from the auxiliary contact of the circuit breaker 13.

In the above explanation, the fault section is determined only by the answer signal, but the solid equipment can determine the base of the fault distribution line and the name of each switching type belonging to the distribution line. After power is transmitted again, the circuit breaker 12 is closed and the battery is charged to a healthy section.

When the solid state device is charged to the healthy range, the solid device sends a monitoring signal to the relevant switch, reconfirms the status of the switch, and
The correct accident section can be determined.

As is clear from the above description, according to the present invention, it is possible to know the status of the switch of the distribution line, including the section where the accident occurred, using a solid device.

[Brief explanation of the drawing]

Fig. 1 is a diagram of a remote monitoring and control system for distribution line equipment using distribution line transportation, Fig. 2 is a general distribution line system diagram, and Fig. 3 is a block diagram of a controller used for determining fault sections of distribution lines according to the present invention. FIG. 4 is a waveform diagram showing the operating state of the present invention. 1...Solid equipment, 3,11...Distribution busbar, 4゜15a to 16d, 17-...Distribution line, 6.14a to 14d...・Switch, 6...
...Current transformer, 7a to 7C...Relay device, 9
... Communication line, 13 ... Circuit breaker, 16a
-Jlea...Controller.

Claims (2)

[Claims] (1) A relay device installed at a substation that has the function of injecting a downstream carrier signal between the busbar lines of a distribution line and the function of receiving an upstream answer signal from the current transformer of each distribution line, and A slave station having a function of receiving the carrier signal of the transmission line and transmitting the status of the equipment distributed on the distribution line as an answer signal to the distribution bus line is connected to the relay device through a dedicated communication line, and is transmitted through the distribution line. It is composed of a solid device that judges the results of bidirectional communication commands and answer signals, and is equipped with a function to return an emergency answer signal to the slave station when the power is restored. - A distribution line fault section determination method characterized by determining a signal-side fault section. (2) Distribution line accident section determination according to claim 1, characterized in that the faulty distribution line and its section are determined based on the answer signal from each slave station and the open/closed state of the circuit breaker of the distribution line. Method.