JPS62155738A - Automated apparatus for distribution 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 [Technical Field of the Invention] The present invention relates to an automation device for a power distribution system, and particularly to an automation device for a power distribution system that automatically sequentially turns on distribution lines divided into a plurality of sections.

[Technical background of the invention] FIG. 6 shows a conventional fault section isolation device.

In Figure 6, 1 is a reclosing relay, 2 is a distribution line, CB
The circuit breakers, S/S substations, and S-1 to SWL are switches that divide the distribution line into appropriate sections. Among these, the breakers are used as loop points and are always open.

FORG, accident investigation device, P[14ffl 3 SWI
~ Power source for SWL and HiS detective device FOR, etc.
3 is a central monitoring board (hereinafter referred to as the master station) that centrally monitors the circuit breaker SW or circuit breaker CB, etc. 4-1 to 4- are transceivers (hereinafter referred to as slave stations) that transmit the status of each switch SW to the master station or transmit a signal from the master station to each switch SW.

5 is the communication line, and F is the accident point.

In FIG. 6, FIG. 7 shows a time chart of each device when the accident occurred in section (■).

In Fig. 7, A to ■ are the times, and T1 is the re-closing relay 1.
, T2 is the second re-closing time of the re-closing relay, and X is the closing time of the accident investigation device FOR.

Here, the closing time limit is the time from when the power supply side of the switch needle is charged until the switch needle closes, and X is generally set as shown in the following equation.

X = (maximum operating time of protective relay) + (maximum operating time of breaker) + (margin) Y is the detection time limit of the accident investigation device FOR.The detection time limit refers to This is a time limit for determining whether or not an accident occurred on the side of the driver, and is set to a value somewhat smaller than the above-mentioned input time limit.

FIG. 7 shows the operation when an accident occurs in section (2) of the distribution line shown in FIG. 6. First, if an accident occurs at time A,
The circuit breaker CB is tripped by the operation of a protective relay (not shown). As a result, each of the switches SWI-3144 becomes open-circuited without voltage at approximately the same time.

Next, the circuit breaker CB is closed at time B after the first reclosing time T1 has elapsed by the reclosing relay 1.

Therefore, the switch hand 1 is closed at time C which is X time periods after time B. Similarly, switches SW2 and SW3 are also closed in sequence at X time intervals.

Here, when the switch SW3 is closed at time E, the fault section is closed, and the circuit breaker CB is tripped again at time F due to the operation of the protective relay (not shown). As a result, the RJ interlayers 5W1-3W3 are also opened without voltage again.

Here, the accident investigation device FDR3 closes and locks the switch SW3 by turning off the power during the Y time period. Also, accident investigation device F
DR4 closes and locks the switch SW4 when the power is cut off during the X time period.

Next, from time F, the breaker CB is re-closed at time G after the second re-closing time limit T2 has elapsed by the re-closing relay 1.

Next, the switches SW1 and SW2 are sequentially closed at X time intervals. However, the switch SW3 is not closed because it is locked.

Next, the switch SWL at the loop point is turned on by remote control from the master station 3 through the slave station 4-S and the accident investigation device FDRL.

However, since the switch SW4 is locked, it is not turned on, and as a result, power can be supplied to other sections except the accident section (2).

[Problems with the Background Art] The conventional device having the above configuration requires an accident investigation device for each switch, and the functions of the accident investigation device include counting of X time period and Y time period, counting of X and Y time periods, etc. A lock function when the power is cut off, a power loss countermeasure function that distinguishes between fault areas and intervals when the power is cut off, a sequential function that sequentially turns on the power from the power side when an accident occurs, and a loop point that turns on after the fault section is separated, and then sequentially from the opposite side. It was necessary to have a reverse feed function for inputting. Furthermore, since these devices are installed outdoors on poles, they require sufficient surge protection against lightning and the like, and weather resistance to withstand severe climate changes. In short, despite the poor environment of the installation location,
It required complex functionality.

In addition, after locking the accident section, power transmission to the healthy section is
Since power is supplied sequentially in each time period, if there are many sections, it takes a long time to supply power.

[Object of the invention] The present invention was made to solve the above problems, and provides an automation device for a power distribution system that does not require an accident investigation device and can shorten the time required to supply power to healthy sections. The purpose is to

[Summary of the Invention] In the present invention, the reclosing relay installed in the substation has an accident investigation function, the accident investigation device at each division point is omitted, and the accident section is investigated by the first reclosure after an accident occurs. After identification, the system attempts to simultaneously close the circuit breaker for the healthy sections excluding the accident section by re-closing the circuits.

[Embodiments of the invention] Examples will be described below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of a power distribution system automation device according to the present invention. In FIG. 1, the same parts as those in FIG. 6 will be referred to as the same parts and a description thereof will be omitted. 1-1
is a reclosing relay and has an accident section operation function.

Therefore, there is no accident investigation device FOR at each division point, and direct opening/closing 3 or 1
~514L. The other configurations are the same as in FIG. 6.

Figure 2 is a time chart of each start-up relay when an accident occurs in section ■.
The input time is counted by , and the time is set using the same concept as X described above. The overall operation of the switch will be explained using FIG.

First, when an accident occurs in section (3) at time A, the circuit breaker CB trips due to the operation of a protective relay (not shown).

As a result, the opening/closing terminals 3 or 1 to 3144 are opened without voltage at approximately the same time.

Next, the first re-closing time T is set by the re-closing relay 1-1.
At time B after one elapse, the circuit breaker CB is turned on. After the CB is turned on, the re-closing relay 1-1 determines whether or not the CB is re-shut-off within the closing time X' counted by the re-closing relay 1-1, but there is no re-shut-off because the accident section is not closed. . Therefore, at time C, a signal from the re-closing relay 1-1 turns on the switch SW1 via the slave station 4-1.

In the same manner, switches SW2 and S3 are applied sequentially up to the X' time interval.
Insert.

Here, when the switch SW3 is turned on at time E, the breaker CB is tripped again at time F due to the operation of the protective relay (not shown) again because the fault section is turned on. As a result, the opening/closing switches 3 or 1 to SW3 are also opened without voltage.

Here, the recloser relay 1-1 is operated after the switch SW3 is turned on.
Since the re-shutoff occurred within the X' time period, the fault point is determined to be section (2), and the output of the re-closing relay 1-1, which controls the switches SW3 and SW4 at both ends of the fault section (2), is locked.

Next, in order to supply power to the healthy section, a signal from the re-closing relay 1-1 causes the circuit breaker CB, switch S old, SW2, SWL to be activated at time G after the second re-closing time limit T2 has elapsed.
Inject at the same time. This makes it possible to supply power to sections other than the accident section (■).

FIG. 3 is a diagram showing a specific example of signal transmission between a reclosing relay and a slave station. Therefore, the symbols in the figure also correspond to those in FIG. 52b is the pallet contact of the breaker CB, which is the b contact that is open when the CB is turned on; 6 is the recloser relay 1
Terminals -1 and 7 are sequence circuits of the reclosing relay 1-1, which are configured by a microcomputer (HPu). 8 is a constant voltage circuit; X'2 is slave station 4-1.4-
This is the auxiliary relay for receiving No.2.

The signal transmission method will be explained below using FIG.

First, when there is no accident on the distribution line, that is, when the breaker CB is in the closed state, the pallet contact 52b of the breaker CB is closed. Now, if an accident occurs in section ■, breaker C
B trips and the pallet contact 52b closes. The closing of pallet contact 52b starts the HPU 7 program. The first reclosing output of the program is auxiliary relay
It is output to the outside as a substitute contact 9-R. This output closes the breaker CB and opens the pallet contact 52b.

Next, switch SW1 is turned on according to the program, but
At this time, contact 9-1 of auxiliary relay x1 connects slave station 4-
The receiving relay x'1 of No. 1 is excited and the switch SW1 is closed. However, in this case, since the input is in the accident zone (3), the circuit breaker CB is cut off again and the pallet contact 52b is closed again, so the HPU 7 determines that the accident is in the zone (2).

Next, the output auxiliary relay Xz, x3 of the re-closing relay 1-1, which controls the switches 3142 and the ground 3 at both ends of the accident section, is closed and locked.

Next, in order to supply power to the healthy section, auxiliary relays XR,
+, X4, and XL are operated and transmitted to the slave station.

FIG. 4 is a flowchart illustrating the operation when an accident occurs in section (2).

When the program starts, in step 41,
Determine whether or not the circuit breaker CB is shutting off. When a break occurs, the process proceeds to step 42, and after the first re-closing time limit T1 has elapsed, the breaker CB is turned on. After turning on the circuit breaker CB,
In step 43, it is determined whether the circuit breaker CB is to be shut off again within the closing time limit X'. In this case, since the fault point is in section (2), the process proceeds to step 42-1, and the switch SW1 is closed. After turning on the switch 3 or 1, in step 43-1, it is determined whether the CB should be shut off again within the closing time X' after the switch is turned on. In this case, the accident section is ■, so step 42
Proceed to -2 and insert switch needle 2. The process proceeds in the same manner until the switch SW3 is turned on. In step 42-3, when the switch 5143 is closed, since this is to close the accident zone, the breaker CB is shut off again, and in step 4
Proceed to 4-3 and remove the switch needle 3 and SW4 at both ends of the accident section ■.
The output of the re-closing relay 1-1 that controls the re-closing relay 1-1 is locked.

Then, in step 45-3, after the second re-closing time limit T2, the circuit breaker CB, the gate opening WI, SW2, and SWL are turned on. This allows power to be supplied to sections other than the accident section (■).

Next, an automatic reset is performed in step 46, and the process returns to step 41.

According to the embodiment described above, the accident investigation function is provided to the re-closing relay installed in the substation to separate accident sections, so there is no need to provide an accident investigation device at each division point. Furthermore, since the power supply to the healthy section after determining the fault section does not require the power-on time limit X, the power outage time can be shortened compared to the conventional device.

FIG. 5 is a block diagram of another embodiment of the reclosing relay. In this embodiment, the accident section can be displayed. In Fig. 5, the length is necessarily the display device, 18,...
- 18-5 is a light emitting diode corresponding to the number of protection sections. For example, when it is determined that there is an accident in Section 1, the light emitting diode 18-4 is turned on.

According to this embodiment, the accident section can be displayed by lighting up the light emitting diodes of the determined section.

In the above embodiment, the switches are turned on sequentially when the circuit is reclosed for the first time, but the present invention is not limited to this, and all the switches may be turned on at the same time when the circuit breaker is turned on for the first time.

Further, although the above embodiment uses a re-closing relay having a forward-throw function, this may be done using a conventional re-closing relay and a sequence circuit.

Further, in this embodiment, an example using a communication line has been described, but it is clear that a communication means using power line transport may also be used.

[Effects of the Invention] As explained above, according to the present invention, the reclosing relay installed in the substation is provided with an accident investigation function, so that the accident sections are separated, so that the following effects are achieved.

■The accident investigation device installed at each classification point is no longer required.

■Since supplying power to a healthy section after determining an accident section does not require turn-on time limit X, the power outage time can be shortened compared to a device configured with a conventional accident investigation device.

■Conventional accident investigation devices are installed outdoors on poles, so they are easily affected by climate changes, lightning surges, system voltage changes, etc.In contrast, reclosing relays are installed on the control panel of a substation. Therefore, there is almost no effect of environmental changes, and since the power is supplied by DC battery power, there is no effect of grid voltage at all. This makes it possible to significantly improve reliability.

■Since it is possible to identify the accident zone, it is extremely convenient for maintenance by providing the function as an accident zone indicator.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of an embodiment of the distribution system automation device according to the present invention, Fig. 2 is a time chart of each device when an accident occurs in section FIG. 4 is a flowchart explaining the operation when an accident occurs in the 1st V section, FIG. 5 is a configuration diagram of another embodiment of the reclosing relay, and FIG. FIG. 7 is a diagram illustrating an example of the configuration of a conventional faulty section separation device, and is a time chart illustrating the operation of the conventional faulty section separation device. 1.1-1...Reclosing relay 2...Distribution line 3...
・Central monitoring 1lA (master station) 4-1 to 4-L...Slave station 5
...Communication line 6...Reclosing relay terminal 7...HPU8...
constant voltage circuit

Claims (1)

[Claims] A circuit breaker that connects the distribution line and the busbar, a protective relay that detects faults in the distribution line, a reclosing relay that performs a reclosing operation on the distribution line breaker, and a circuit breaker that divides the distribution line into appropriate sections. A plurality of switches, a plurality of slave stations provided corresponding to each of the switches and controlling each switch, a plurality of power transformers that supply power to the slave stations and the switches, a substation and each In a power distribution system consisting of communication lines installed between slave stations to remotely control each slave station, the above-mentioned recloser relay is installed at a substation, and is used for the first recloser after the breaker is opened due to an accident. At the same time as the circuit is closed, the switch that separates the distribution line is thrown in sequence every predetermined time period, and when the circuit is cut off again, it is determined that the fault is on the load side of the switch that was thrown on just before the cutoff, and the switches at both ends of the fault section are closed. An automation device for a power distribution system characterized by outputting a signal to close a removed switch via a communication line.