JPH04168915A - Fault point isolating unit - Google Patents

Abstract

PURPOSE:To detect faulty section prior to interruption of a distribution line circuit breaker and to switch the load side sound section in the faulty section to other sound distribution line by providing a ground fault detecting means, a fault judging means, and a control means. CONSTITUTION:A procedure calculating means 3 predicts fault in all sections and calculates a procedure for switching the load side sound section in each section from other sound distribution lines and a procedure for isolating the faulty section. A ground fault detecting means 1 detects ground current flowing from a high voltage line to a support thereof and a fault judging means 2 judges in which section of a distribution system the ground fault has occurred based on ground fault information fed from the ground fault detecting means 1. A control means controls a section switch to switch the load side sound section in the faulty section to other sound distribution line according to a previously calculated procedure and isolates the ground fault section from a distribution line through which power has been fed prior to the fault.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a fault point isolation device used in the operation of a power distribution system.

(Prior Art) The ground fault detection, fault section determination, and power transmission operation for the load-side healthy section of the fault section in a conventional device of this type will be explained with reference to FIG.

FIG. 5 shows distribution line F1. F2, section switch 228-2
2d, etc., a case is shown in which a ground fault occurs in three sections of distribution line F2.

In Fig. 5, when the protection device 202 on the distribution line F2 that transmits power to the K3 section detects the occurrence of a ground fault, normally 1
．． Power distribution @ F2 breaker 201 in about 5 to 2.0 seconds
As a result, there will be a power outage in the Kl, 2, 3, and 4 sections of power distribution fiF2. Breaker 2 of distribution line F2
The re-closing device 200 operates at 01 at*, and after a certain period of time the breaker 201 of the distribution line F2 is turned on,
The section switches 22a and 22b are closed by the sequential closing function (hereinafter referred to as sequential closing function) of 3a and 23b. As a result, K1 and K2.

The K3 section will be in a charging state, but if the fault condition continues in the K3 section, the ground fault current will flow again, the protection device 202 of the distribution line F2 will detect the ground fault again, and the breaker of the distribution line F2 will be activated. 201 is shut off again. - Generally, the slave station 22 installed in the power distribution system has a function to lock the switch in the OFF state if the power supply voltage is lost within a certain time period (usually several seconds) of the closing command to the switch. , This function causes the section switch 22b to be in the cut-locked state. After the circuit breaker 201 of the power distribution line F2 is disconnected again, the circuit breaker 201 of the power distribution line F2 is turned on again by the recirculation device 200.

As a result, the forward throw function of the slave station 23a causes the section switch 2 to
2a is turned on, but the section switch 22b is not turned on because it is in the cut and locked state, and two sections of K1 and K1 are charged, and the K3 section and four sections remain without power.

Here, since the K4 section is a healthy section with no accident factors, the operator 204 operates the remote control device 203 to transmit power to the K4 section, closes the section switch 22d, and closes the section switch 22c. Operate the cut lock. As a result, all three of the accident sections suffered a power outage and were cut off from the distribution line that had been receiving power before the ground fault occurred.

In this way, in the conventional equipment configuration, when a ground fault occurs, the distribution line breaker disconnects, recloses, and then disconnects again.

Due to repeated circuit closing operations, the section of the distribution line had to be repeatedly cut off and transmitted power, and only the section where the accident occurred had to be disconnected.

Recently, a device has been developed and put into practical use that uses a computer to determine the fault section and automatically transmits power from other healthy distribution lines to the load rpJ healthy section of the fault section. Also, disconnection of power lines,
The same procedure was used to separate the section where the ground fault occurred while repeating reclosing.

(Problem to be Solved by the Invention) In the conventional device of this kind described above, the ground fault fault section is determined by repeatedly breaking and reclosing the distribution line breaker. Each time a power outage occurred, the entire distribution line would experience a power outage, resulting in unnecessary power outages in healthy power outage sections other than the affected sections.

In addition, power transmission operations in the load-side healthy section of the accident section will start after the accident section has been determined and when it is recognized which section the entire load 1!1 Ifl section is, so power transmission in the load-side healthy section will be delayed. There were also some inconveniences.

The present invention has been made to solve the above problems, and detects the fault section before the distribution line breaker is cut off, switches the healthy section on the load side of the fault section to another healthy distribution line, and finally Specifically, to provide a fault point isolation device capable of separating a ground fault fault section from a distribution line that was receiving power before the fault, thereby minimizing the section in which a power outage occurs in the event of a ground fault fault in a distribution line. It is an object.

[Structure of the Invention] (Means for Solving the Problems) The structure for achieving the above object will be explained with reference to FIG. It consists of calculation means 3 and control means 4.

(Function) First, the procedure calculation means 3 assumes an accident in all sections in advance and calculates the procedure for switching the load RPJ healthy section of each section from other healthy distribution lines and the procedure for disconnecting the section, and performs ground fault detection. Means 1 detects the presence or absence of a ground fault current from a high voltage line to a support that supports the high voltage line, and detects a ground fault in which section of the distribution system based on ground fault information notified from ground fault detection means 1. The accident determining means 2 determines whether or not an accident has occurred. Next, after the accident determination means 2 determines the accident section, the control means controls the on/off of the section switch based on a pre-calculated procedure, switches the load-side healthy section of the accident section to another healthy distribution line, and , disconnect the section where the ground fault occurred from the distribution line that was receiving power before the accident.

(Example) Examples will be described below with reference to the drawings.

Fig. 2 is an overall configuration diagram of the actual male side of the fault point isolation device according to the present invention, and the power distribution system diagram is supported! 6100 is a master station device that receives information from each slave station;
01 is an electronic computer that stores an accident determination program 121, a procedure calculation program 131, a section switch control program 14, and an equipment data file 15. It currently consists of a system file 169 and a procedure file 17.

Figure 3 shows the configuration side of the equipment data file, where the sensor belonging section is stored corresponding to the slave station address.
For example, in the case of address 2 of the slave station 23tl, the section to which the sensor belongs is 3.

Next, the effect will be explained.

First, the procedure calculation program 13 assumes in advance that a ground fault will occur for the entire section or a specific section divided by class M switches, and before the ground fault actually occurs, the distribution line F2 Based on the current grid file 16 that indicates the power transmission status, each time there is a change in the regular cycle or the grid status, the procedure for switching the load S healthy section for each section and the power outage operation procedure for the section are calculated, and a procedure file is created. 17, the data is stored in units of sections as shown in FIG.

The figure shows what command procedures are to be sent out according to the procedure sending order. As mentioned above, the accident section was 3
When switching the healthy section on the load side of the K3 section to the distribution line F1 side, first issue a command to enter the normally open switch 221 to connect to the distribution IIFl side, and then switch the 22C switch secondly.
Three sections are separated by the cutting command, and the third section is 22b.
3 itself is separated from the distribution line in the accident section by the disconnection command.

Here, if a ground fault accident occurs at the support 21 in the third section of the distribution line, the ground fault sensor 11 installed on this support 21 will detect the ground fault current (within 0.2 seconds). is detected and notified to the master station device 100 via the slave station 23b. The master station device 100 notifies the computer 101 of the ground fault sensor operation notified from the slave station 23b (within 0.1 seconds). The computer 101 starts the accident determination program 12 (within 0.2 seconds) in response to the ground fault information notification from the master station device 100. The accident determination program 12 searches the equipment data file 15 shown in FIG. Search for the procedure for the 3 sections that have been calculated in advance.

For this purpose, the section switch control program 14 is activated, and the section switch control program 14 extracts the procedures from the procedure file 17 in the order in which the procedures are sent out, and sends them to the master station device 100. Master station equipment! 100 enters the section switch 22d (within 0.8 seconds) and turns off 22c and 22b. As a result, after a ground fault occurred in distribution line F2, (1,
(Within 3 seconds) The ground fault section, N3, loses power, and the K4 section is switched to the distribution line F1.

According to the above embodiment, the accident section is directly identified using the ground fault sensor installed in each support, and <1. - By completing the operation of the section switch (within 3 seconds), the fault section can be disconnected before the distribution line breaker is disconnected.

In addition to the above embodiments, the following methods may be used.

■ In the ground fault detection means of the above embodiment, the ground fault sensor detects the ground fault current flowing from the high voltage line to the support and notifies the slave station of the occurrence of a ground fault. Banks and distribution lines are equipped with ground fault detection means to detect the presence or absence of ground fault current in electric wires.

By notifying the computer of the ground fault detection information of each slave station again and having the computer's fault determination means make a comprehensive determination, it is possible to avoid malfunctions of the system due to malfunctions of individual slave stations.

■ The procedure calculated by the procedure calculation means of the above example is the load of the accident section + 1116! The entire section is switched from other healthy distribution lines without interruption, but this uninterruptible switching is called power outage switching, in other words, the load-side healthy section of the accident section is temporarily cut off, and then power is transmitted from other healthy distribution lines ( In the above embodiment, the section switch 22c is turned off and the section switch 22d is turned on), thereby making it possible to prevent ground faults from spreading to other distribution lines due to the characteristics of the distribution system.

■ The accident point disconnection in the above embodiment is to disconnect the accident section when the occurrence of a ground fault is detected for the first time, but is not limited to this, and after the accident section is disconnected, a trial power transmission to the disconnected accident section is performed. By adding a test power transmission means and a means for re-sending fault section disconnection procedure when another ground fault phenomenon is detected due to the test power transmission, the test power transmission means and the ground fault detection means,
It may be determined whether or not a ground fault phenomenon is detected again by performing a trial power transmission to the accident section where the power outage occurred once.

In this way, if a ground fault phenomenon is detected again as a result of the trial power transmission, the fault section disconnection procedure re-sending means will send out the disconnection procedure for the section and cause a power outage, thereby retransmitting power to the fault section. If the ground fault phenomenon disappears, power can be transmitted to the accident section and a power outage can be avoided. Therefore, the power outage time can be further shortened in case of momentary ground fault or intermittent ground fault.

[Effects of the Invention] As explained above, according to the present invention, by instantaneously determining the faulty section and performing high-speed and automatic remote operation of the switch, it is possible to prevent the problem from occurring in the healthy section due to the disconnection of the distribution line breaker. It is possible to provide a fault point isolation device that can minimize the range of power outage by switching between healthy sections on the load side of the fault section and disconnecting the fault section without causing unnecessary power outages, thereby improving the reliability of power supply. .

[Brief explanation of the drawing]

Fig. 1 is a block configuration diagram of a fault point isolation device according to the present invention, Fig. 2 is a configuration diagram of an embodiment including the power distribution system, and Fig. 3
The figure shows the storage contents of the equipment data file in one embodiment of the present invention, FIG. 4 shows the storage contents of the procedure file in another embodiment of the invention, and FIG. 5 shows an example of a conventional device. It is a diagram. 1... Ground fault detection means 2... Accident determination means 3.
...Procedure calculation means 4...Control means patent applicant
Kyushu Electric Power Co., Inc. (and 1 other person) Representative Patent Attorney Norio Ishii Figure 2 Figure 3

Claims (1)

[Claims] Each division point is divided into multiple divisions by a division switch, and when an accident occurs in one of the divisions, the accident section is separated and the healthy section on the load side is switched to another healthy distribution line. In the fault point isolation device for processing, a ground fault detection means detects the occurrence of a ground fault accident by detecting a ground fault current flowing from a high voltage line to a support that supports the high voltage line;
An accident determination means that determines the accident section based on the ground fault information notified from the earth fault detection means, and a procedure for switching the healthy section on the load side for the entire section or a specific section, and a procedure for power outage operation for the section are calculated and stored in advance. according to a procedure calculation means and a procedure stored in the procedure calculation means corresponding to an accident section in which an accident has been determined by the accident determination means before the distribution line or breaker is disconnected by its protective relay; An accident point isolation device characterized by comprising a control means for operating the corresponding switch.