JPH04251521A - Rapid isolating system for accident section - Google Patents

Abstract

PURPOSE:To isolate a trouble block by finding the trouble block automatically immediately after a trouble occurs on a distribution line. CONSTITUTION:Many member stations 5 are located along a distribution line 2. A member station 5 which has detected an accident communicates with a member station 5 on the load side to ask if the trouble has already been detected by the slave station on the load side, without receiving an inquiry on the trouble from a host station 4. If many member stations communicate with each other simultaneously, circuits are confused. Therefore, a communication order is so controlled that only the member station 5 on the accident section power supply side can communicate according to the set time of a timer. When an accident section is specified by this communication, the accident section is rapidly isolated.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a fault section high-speed separation system for automatically determining the fault section and separating it from the healthy section when a short circuit accident, ground fault accident, etc. occurs on a power distribution line. be.

0002

[Prior Art] When an accident occurs on a power distribution line,
It is desirable to minimize the impact on the healthy sections by separating the accident section from the healthy sections. For this reason, a master station for control has traditionally been installed at a substation, etc., and
A large number of slave stations are placed along the distribution line, and when an accident occurs, the accident section is determined by a polling method in which the master station inquires about the accident information from each slave station sequentially, and the accident area is separated by a signal from the master station. He was operating the switch for the purpose of However, this polling method has the problem that it takes time to make inquiries to a large number of slave stations, resulting in a delay in isolating the accident area.

0003

[Problems to be Solved by the Invention] The present invention solves the above-mentioned conventional problems and provides a high-speed accident section separation system that can quickly determine and separate the accident section when an accident occurs. It has been completed to provide.

[Means to solve the problem]

[0004] In order to solve the above problems, the present inventor first adopted a method in which, when an accident occurs, adjacent slave stations communicate with each other to inquire whether or not an accident has been detected. We considered ways to shorten the time required. However, since an accident is detected almost simultaneously in all the slave stations on the power supply side of the accident point, communication is performed simultaneously among a large number of slave stations. Moreover, since the slave stations are often connected through a common communication line, it has been found that there is a risk that communication collisions may occur on the communication line and normal communication may not be possible. As a result of further studies, the inventor of the present invention found that the above problem can be solved by managing communications between the respective slave stations to provide a time difference in communication between them.

The present invention was completed as a result of the above studies, and consists of placing a large number of slave stations connected to a master station through a common communication line along a power distribution line, and any slave station that detects an accident is The system is characterized in that a timer having a different setting time is started for each slave station, and after the set time has elapsed, activation of accident processing in other slave stations is stopped, and the accident detection slave station takes the initiative in handling the accident. It is something.

The present invention will be explained in more detail below with reference to the drawings. FIG. 1 is an example of a circuit diagram showing the entire system of the present invention, where 1 is a substation and 2 is a distribution line. connected via. Therefore, when an accident occurs on one distribution line 2, it is possible to supply power from the other distribution line 2 to the section other than the accident point via the interconnection automatic switch 3.

[0007] The substation 1 is provided with a master station 4 for control, and a number of slave stations 5 such as S1 and S2 are arranged on the distribution line 2 at appropriate distances. These slave stations 5 and master station 4 are connected by a common communication line 6 such as a bus system. Further, automatic switches 7 such as SW1 and SW2 are connected to each slave station 5. Note that 8 is a circuit breaker for the substation 1.

FIG. 2 shows the internal circuit of the slave station 5, which includes a control CPU 9 for controlling the opening/closing of each automatic switch 7 when an accident is detected by a sensor, and a control CPU 9 for controlling the opening/closing of each automatic switch 7 when an accident is detected by a sensor. It also includes a communication CPU 10 that performs communication. These two CPUs are connected by a bidirectional read/write RAM 11, allowing large amounts of data to be exchanged quickly and easily.

In addition, a high-speed processing circuit 13 is provided for performing high-speed processing by skipping over the control CPU 9 when the accident determination circuit 12 determines that an accident has occurred. This high-speed processing circuit 13 is connected to an accident determination circuit 12 and a line use determination circuit 14, and starts a timer when an AND condition is established between an accident detection signal and a line non-use signal as shown in FIG. It starts up and controls the communication circuit 15 to communicate with the slave station 5 on the load side after the timer set time elapses. However, even after the timer is activated, if the line not in use signal is interrupted (when the line becomes in use), the timer is reset and no communication takes place.

[0010] Furthermore, if an accident is detected in a slave station 5 on the power supply side from the fault point, such as a short circuit or a ground fault, the timer of each slave station 5 will change the set time as the slave station 5 on the terminal side It shall be kept short. Therefore, for example, in S4, 1
0ms, 20ms for S3, 30ms for S2, and 40ms for S1. In addition, the timer setting time is set at the master station 4 so that it can respond to changes in the power distribution system.
It is preferable to allow changes to be made via communication. In addition, when an accident is detected on the load side from the accident point, such as a disconnection accident, the setting time is set to be shorter for the power supply side slave station 5. A system with separate timers can be considered for the above two types of accidents.

Next, the operation of this system will be explained. In the system of the present invention configured in this way, FIG.
If an accident occurs between S3 and S4 as shown in FIG. 2, the slave stations 5 of S1, S2, and S3 on the power supply side of the accident point will almost simultaneously detect the occurrence of the accident. Since the communication line 6 is not in use at this moment, these slave stations 5
Then, the AND condition between the accident detection signal and the line unused signal is established, and the timer is started. However, as described above, the timer setting time is selected to be shorter as the terminal side of the slave station 5 increases, so that among S1 to S3, the timer setting time of S3 elapses first.

For this reason, S3 first inquires of S4, which is the slave station 5 on the load side, as to whether there is an accident. This S
Since the communication line 6 is put into use by the communication between S1 and S4, the AND condition in the logic of FIG. 3 no longer holds true in the slave stations 4 of S1 and S2 whose timers are in operation, and the timers are reset. Therefore, during the communication between S3 and S4, the other slave station 5 that detected the accident will not make a call. The master station 4 also stops polling through this communication.

On the other hand, S4, which has received an inquiry from S3 as to whether there is an accident, returns a signal to the effect that no accident has been detected to S3. As a result, S3 can confirm that an accident has occurred between S3 and S4, and based on the data entered in advance, sends a closing signal for the interconnection automatic switch 3 to its controlling slave station, and also At the same time as opening the automatic switch 7 of
An open signal is also sent to the automatic switch 7 of S4, which is the slave station 5 on the load side, to end the process, and a signal to end the process is sent to the master station 4 to return to the normal state. In this way, S3, which is the accident section,
Only the section between and S4 will be separated, and power will be supplied through the conventional route up to S3, and power will be supplied from the distribution line 2 of the other system via the interconnection automatic switch 3 to the section after S4. .

As described above, in the system of the present invention, communication is always given priority from the slave station 5 closest to the accident point to the slave station 5 on the load side adjacent thereto, and communication between each slave station 5 is Since the accident section can be identified with just one inquiry without communication collisions, it is possible to separate the accident section at high speed.

Note that when a loop type communication line is used between each slave station 5, the usage status of the line is monitored by other slave stations 5.
Therefore, as mentioned above, the system cannot be started on the condition that the line is not used. However, in this loop method, high-speed optical communication is often used, and the time for a signal to go around all the slave stations once is extremely short, about several milliseconds. Therefore, slave station 5, which detected the accident, performs high-speed processing after receiving the communication. The same processing as described above can be performed by sending a signal to stop polling from the master station 4, and starting a timer by stopping this polling in the same way as described above.

[0016] Furthermore, in the above explanation, it was assumed that the process is completed only by communication between S3 and S4, but it is also possible to have all slave stations on the power supply side execute communication to cancel the process. . Furthermore, it is of course possible to employ a method in which all slave stations 5 on the power supply side communicate with slave stations 5 on the load side.

[0017] Furthermore, in conventional systems, it takes several minutes to detect a faulty section, but in this case, the switch only needs to be controlled in about one minute. An information transmission path 16 such as a pair cable is provided between each slave station 5. In this case, by adding a new optical cable etc. between each slave station 5 for high-speed processing,
It becomes possible to implement the present invention by using a conventional pair cable for normal communication and using an optical cable only for handling an accident. In this case, the switch control device will be comprised of a slave station for conventional systems and a slave station for high-speed processing. The control circuit of the slave station for high-speed processing is as shown in FIG. 5, and the high-speed station CPU 17 receives a control signal from the slave station for the conventional system and controls the switch.

[0018]

[Effects of the Invention] As explained above, in the case of an accident, the present invention allows slave stations to communicate in a predetermined order, thereby making it possible to quickly determine the accident section and separate it. Unlike the conventional polling method, it does not take a long time to determine and separate fault sections, so it can exhibit excellent effects such as shortening power outage time. Therefore, the present invention greatly contributes to the development of industry as a high-speed accident zone separation system that eliminates the problems of the conventional system.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing the entire system of the present invention.

FIG. 2 is a block diagram showing an internal circuit of a slave station in the system of the present invention.

FIG. 3 is a block diagram showing communication control logic performed in a high-speed processing circuit of a slave station.

FIG. 4 is a circuit diagram showing an example in which the system of the present invention is combined with an existing system.

FIG. 5 is a block diagram showing a control circuit of a slave station for high-speed processing in the system of FIG. 4;

[Explanation of symbols]

2　Power distribution line 4. Master station 5.Slave station 6 Communication line

Claims (1)

[Claims] [Claim 1] A common communication line (6) connects the master station (
4) A large number of slave stations (5) connected to the distribution line (2)
A slave station placed along the road that detected an accident (5)
starts a timer with a different set time for each slave station, and after the set time has elapsed, the activation of accident processing in other slave stations (5) is stopped, and the accident detection slave station (5) takes the initiative in handling the accident. This is a high-speed accident section separation system that is characterized by the following: