JP3034357B2 - Distribution system operation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distribution system operation device for detecting a disconnection accident occurring in a distribution system.

[0002]

2. Description of the Related Art Conventionally, when a disconnection accident occurs in a power distribution system, only a protection device installed on a substation side has a small load area or a small load area located at a terminal branched in a branch from the configuration of the power distribution system. However, in the branch distribution line area where the load current is smaller than that of the trunk line, the operation allowable current value of the protection device is not reached, and there is a case where disconnection cannot be detected. Also, the instantaneous ground fault and the disconnection accident often overlap. In general, as a method of detecting this accident point, a time-recovery accident investigation method is adopted, in which a reclosing device installed at a substation and a circuit breaker for distribution lines are combined and charged in units of distribution lines. I have. That is,
After turning on the circuit breaker for distribution lines, the circuit breakers are sequentially closed at regular intervals from the power supply side for each section, and the circuit breaker for distribution lines is re-cut off within a predetermined time after a certain switch is closed. Then, the load-side section of the last closed switch is determined as an accident section. However, in this system, even if the electricity reaches the point where the disconnection occurs due to the occurrence of the disconnection, the protection device of the substation often cannot detect the location where the disconnection occurs due to insufficient detection current. Therefore, regarding the detection of the location where the disconnection has occurred, the countermeasure is not perfect, and there remains a problem.

[0003]

Therefore, as a procedure for eliminating a disconnection accident, it is necessary to investigate the location where the disconnection has occurred, and the work may involve a large number of maintenance personnel depending on the scale of the distribution system. . In addition, the contents of the survey are surveyed while confirming the connection relations one by one based on the latest information on distribution lines, which are constantly changing, and the distribution system diagram. Investigations had to be carried out, and the discovery required a great deal of effort and time. In addition, as a temporary measure until the renovation after the location of the disconnection is discovered, it is necessary to open and close the switch to separate the other healthy sections from the disconnection section in order to minimize the range of the power failure due to the disconnection accident. In the same manner as described above, the switching operation was performed while checking the latest distribution system state. As described above, regarding the occurrence of a disconnection accident, it is not sufficient to use a conventional detection method using a substation protection device. Further, in a distribution system that is complicated and whose system configuration changes day by day, once a disconnection accident occurs, a great deal of labor and time is spent as described above to find a disconnection location. In recent years, the social situation in response to power demand has demanded an improvement in the quality of power supply.
Create a switch operation procedure early to remove the section where the disconnection occurred. Prevention of spillover power failure accidents due to erroneous switch operation. Was mentioned as an issue that needs to be resolved immediately. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a power distribution system operating device capable of reliably detecting a disconnection accident.

[0004]

In order to achieve the above-mentioned object, the present invention provides a conventional protection device installed only on the substation side and a segmented switch (hereinafter referred to as a switch) installed in the distribution system. And a remote monitoring and control device slave station (hereinafter referred to as a TC slave station) for monitoring and remotely controlling the switch, and a section-based distribution line provided for each TC slave station. A disconnection detection relay capable of detecting disconnection occurrence and transmitting detection information via the TC slave station, and a remote monitoring control device master station (hereinafter, referred to as a TC master station) that supervises monitoring information from the TC slave station. And the power distribution system status is stored based on the latest power distribution system status information from the TC master station, and when a disconnection occurs, the location of the disconnection (hereinafter referred to as the disconnection source) is detected from the latest storage information and the disconnection occurrence information. Disconnection source determining means, Switch operation procedure creation means for creating a switch operation procedure until power is supplied to a sound load side power failure section generated by the removal of the disconnection accident occurrence source determined according to the above, and the creation And a switch operation instructing means for executing the set operation procedure.

The disconnection accident that has occurred in the distribution system is detected by the disconnection detection relay on a section basis, and is notified via the TC slave station and the TC master station. In order to distinguish a disconnection accident and an instantaneous ground fault accident from the notified disconnection occurrence signal, a disconnection accident is determined on condition that the disconnection detection relay does not return after a predetermined time.
In many cases, the distribution line is momentarily brought into contact with the ground or a structure under the influence of a strong wind or a tree bend, and then stopped in a hanging state. If the distribution line is permanently broken, it is necessary to repair the broken part without recovering after the passage of time. The determining means for detecting the source of the disconnection using the operation information of the disconnection relay recognizes the operation location of the disconnection relay based on the connection information of the distribution system stored in advance, and determines the operation location of the recognized disconnection detection relay. Of these, the part located closest to the power supply is determined to be the disconnection source. Next, the switch operating procedure creating means separates the section of the disconnection source from the system and transmits power from another system to the load side healthy section of the disconnection source section, so that the switch forming the disconnection source section is opened and closed. Create operating procedures. The switch operation instructing means instructs execution of the created switch operation procedure.

[0005]

An embodiment will be described below with reference to the drawings. FIG.
FIG. 1 is a structural view of one embodiment of a distribution system operating device according to the present invention, which shows a part of one distribution line in a distribution system, and includes a distribution line breaker 1 and switch groups SW1, SW.
A disconnection detection relay 17 for detecting a disconnection in the load side section of the switch in the distribution system composed of 2,..., And a TC for transmitting the disconnection detection signal or the switch open / close signal.
It is composed of a slave station 15 and a TC master station 12 that supervises the TC slave station 15, and an arithmetic unit 13. The arithmetic unit 13 includes a disconnection source determining unit 13A that determines a disconnection source based on a detection signal of a disconnection accident that has occurred in the power distribution system, and a switch operation procedure for removing the determined disconnection source section from the system. A switch operating procedure creating means 13B for creating a switch operating procedure for providing electricity to a load-side section from a disconnection source where a power failure occurs after removal.
And a switch operation instruction means 13C for executing the created means 13B via the TC master station 12 and the TC slave station 15.

Next, the operation will be described. The operation of the above device will be described with reference to FIG. FIG. 2 (a) shows one distribution line of a typical distribution line system. The distribution line breaker 1, the switches SW1, SW2, SW3 and SW4 are shown.
, And a tie switch TSW9 which is always open for connection with other distribution systems, and a branch switch SW5, a tie switch TSW8, and switches SW6, SW7, tie And a switch TSW10. 2 (b) shows the open / closed state of the switch, FIG. 2 (c) shows the operation state of the disconnection detection relay, and FIG. 2 (d) shows the presence or absence of a disconnection accident in the section. Here, the TC slave station is omitted to make the operation of the disconnection detection relay easy to understand.

[0007] This distribution system is in a state where the entire section from the distribution line circuit breaker side is charged, indicating a normal state. That is, the distribution line breaker 1 and the switches SW1, SW2, S
W3, SW4, SW5, SW6, SW7 are closed, tie switches TSW8, TSW9, TSW10 are open, disconnection detection relays DR1, DR2, DR3, DR4, DR5.
, DR6, DR7 do not detect disconnection. In such a state, for example, when a disconnection accident occurs at the load side section D of the switch 2 (A), a circuit breaker for a distribution line,
Fig. 2 for switch, disconnection detection relay and section status
Changes as shown in FIG. That is, the disconnection detection relays DR3, DR4, DR6, DR7 connected to the load side system from the disconnection originating point (a) also detect the disconnection and operate, but the switches SW3, SW4, SW6, SE7 are closed. Is maintained, and power transmission is continued in the same manner as in the normal state despite the occurrence of a disconnection accident.

The change in the state of the disconnection relay is caused by the TC slave station 15,
The input to the arithmetic unit 13 via the TC master station 12
First, after a certain period of time is waited until a disconnection accident is determined for the purpose of distinguishing from an instantaneous ground fault accident, the disconnection accident is determined. The disconnection source judging means 13A checks the latest disconnection detection relay information stored for each power distribution system, and detects a disconnection detection relay on the most power supply side (in this case, the disconnection detection relay DR2) which has not been restored after a predetermined time. The point (section D) which is the detection range is determined as the disconnection source section. FIG. 7 shows a detailed processing flow. Next, in order to limit the influence range of the disconnection accident to the minimum range, a process for creating a switch operation procedure for separating the disconnection source section and the healthy section on the load side is performed. The switch operating procedure creating means 13B first searches for a switch group forming the section where the disconnection accident occurred (in this case, the switch SW
2, SW3, SW6), and checking the open / closed state (in this case, all closed), creates a switch operating procedure for removing the disconnection source section from the system. In this procedure, all the switch groups forming the disconnection source section are opened, and first, the load-side switch group (in this case,
Opening operation is performed from the switches SW6 and SW3), and finally the switch (switch SW) located closest to the power source in the section where the disconnection originated.
2) is the order to open the circuit. This order is shown in FIG.

As a result, all of the sections E, F, G, and H have a power failure. Therefore, when the switch operating procedure is created and then executed according to the created procedure, the switch is temporarily executed for the purpose of searching for a load-side healthy section where a power failure occurs. Since the power failure section where the power failure occurs temporarily due to the temporary execution is a sound power failure section, it is necessary to create and execute an accommodation procedure for transmitting power. In other words, the switch operating procedure creating means 13B transmits a tie switch (in this case, the tie switches TSW9, TSW) from another system to a healthy power failure section on the load side of the disconnection source section.
SW10) to exchange electricity. A switch operating procedure is added to the created operating procedure. This order is shown in FIG. 6, and a detailed processing flow is shown in FIG. The switch operation instruction means 13C issues an operation execution instruction to the TC master station 12 in accordance with the switch operation procedure. FIG. 9 shows a detailed processing flow. FIG. 4 shows a result and a state of executing the operation instruction of the means 13C in accordance with the switch operating procedure created by the means 13B by the distribution system operating device.

Next, the processing performed by the arithmetic unit 13 will be described.
This will be described with reference to the flowcharts of FIGS. 7, 8, and 9.
First, the disconnection source determining means 13A of FIG. 7 performs a process of determining the disconnection source from the operation information of the disconnection detection relay when a disconnection accident occurs in the power distribution system. In step S71, after the disconnection occurrence information is received from the disconnection detection relay via the TC slave device and the TC master device, in step S72, the process waits for a predetermined time to distinguish from an instantaneous ground fault. In step S73, it is checked again whether or not the disconnection information remains. If it remains, it is collected and stored in step S74. Step S7
5 examines the positional relationship between the stored disconnection sections. In step S76, the sections are sorted in the order closer to the power supply, and in step S77, the section at the head is determined as the disconnection source.

Next, the switch operation procedure creating means 13B shown in FIG.
Performs a process of removing the above-described disconnection source from the system and creating a switch operation procedure for supplying power to all sections on the load side where a power failure occurs due to the removal. In step S81, the determined disconnection source section is set, and in step S82, a switch group forming the disconnection source section is searched. Step S83
To determine the presence or absence of a switch, and if not, the process is terminated. If the switch is installed, the data is collected and stored in step S84. In step S85, the stored switches are taken out one by one, and in step S87, the open / closed state is checked. In step S88, if the check result is the open state, the process returns to step S85. If the check result is the closed state, the process proceeds to step S89 to store. Thereafter, the flow returns to step S85. If the above repetition is completed for all switches,
The process proceeds from step S86 to step S810. Here, the stored closed circuit switches are sorted in the order of the remote position from the disconnection source section.

In step S811, a process for creating an operation procedure list for performing the opening operation is performed. Next, in step S812, temporary execution processing is performed according to the opening operation procedure list created in step S811. In step S813, as a result of the temporary execution performed in step S812, it is determined whether or not a temporary power outage section has occurred in the load side section from the disconnection source, and if not, the process ends. If it has occurred, a temporary power outage section is collected and stored in step S814. In step S815, the switches and tie switches connected to the stored system of the temporary blackout section are searched and collected. In step S816, the other system connected to the tie switch is checked, and whether or not power can be supplied from the other system to the temporary blackout section is determined by a power interchange calculation process. In step S817, the result of the interchange calculation process is determined. If supply is not possible, the process ends.If supply is possible, in step S818, a switch operation procedure list for power interchange including switches of another system is created. Perform

Next, the instruction procedure creating means 13C shown in FIG. 9 issues an execution instruction in accordance with the switch operation procedure list obtained by the means 13B. In step S91, a switch operation procedure list of the switch is set to remove the disconnection source section from the distribution line. In step S92, the target switches created in the operation order are taken out one by one in order. In step S94, before issuing an operation execution instruction to the target switch, a selection control signal is transmitted to the target switch in advance in order to confirm whether a transmission instruction and a reply response are normally performed. In step S95, it is determined whether there is a normal response. If the response is abnormal, the process is terminated. If the response is normal, an operation is instructed in step S96. In step S97, the result of the operation response from the switch is determined. If the response is abnormal, the process ends, and if the response is normal, the process returns to step S92 to instruct the next switch to execute. As described above, when the instruction to execute the operation of all switches is completed, steps S93 to S9 are performed.
Proceed to 8. Here, as a result of the operation execution instruction, the disconnection source section is removed from the distribution line, and section information is searched and collected in order to confirm whether or not a power failure has occurred in the load-side section.

In step S99, the collection result is stored in the above-mentioned means 13.
A comparison is made with the temporary power failure section performed in B to determine whether the same result is obtained. If they are the same, the switch operation procedure list for power interchange created by the means 13B is set in step S910 in order to interchange power to the power outage section. When it is different from the result of the temporary blackout section, step S99 ends. In step S911, take out the switches to be operated one by one,
In step S913, selection control is performed on the target switch to confirm whether transmission and reply responses are normal, and the response result is determined in step S914. If the response is normal, an operation execution instruction is issued in step S915, and if the response is abnormal, the process ends. In step S916, the result of the operation response from the switch in response to the execution instruction is determined. If the response is abnormal, the process ends. If the response is normal, the process returns to step S911. As described above, the process ends after the execution instruction of all the switches to be operated is completed and the normal response is confirmed. As described above, according to the present embodiment, when a disconnection accident occurs in the distribution system, the range of the affected disconnection accident can be quickly detected, the source of the disconnection accident can be determined, and from the distribution system. It is possible to automatically remove the source of the disconnection accident and to perform a flexible operation until power is supplied to a healthy load-side power failure section that has occurred with the removal.

[0015]

As described above, according to the present invention, when a disconnection accident occurs in the power distribution system, the operations performed by the conventional operators and maintenance personnel can be automated, so that the operation can be performed quickly and accurately. It is possible to provide a power distribution system operation device that can respond, save labor and maintenance, and greatly reduce the time required for accident recovery.

[Brief description of the drawings]

FIG. 1 is a structural diagram of an embodiment of a power distribution operation device according to the present invention.

FIG. 2 is a power distribution system diagram in a normal state.

FIG. 3 is a power distribution system diagram when a disconnection accident occurs.

FIG. 4 is a diagram of a distribution system that is interchangeable from other systems.

FIG. 5 is a diagram showing a procedure for opening a switch located closest to the power supply in the disconnection source section;

FIG. 6 is a diagram showing a procedure for accommodating a healthy section on the load side of a disconnection source section.

FIG. 7 is a flowchart showing the processing contents of a disconnection source determining means 13A.

FIG. 8 is a flowchart showing processing contents of a switch operation procedure creating means 13B.

FIG. 9 is a flowchart showing processing contents of an execution instruction procedure creating means 13C.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Circuit breaker for distribution lines SW1, SW2 Classified switch 12 TC master station 13 Computing device 13A Disconnection source determination means 13B Switch operation procedure creation means 13C Switch operation instruction means 15 TC slave station 17 Disconnection detection relay

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02H 7/26 H02H 3/08-3/52

Claims (1)

(57) [Claims] 1. A distribution system operation device for managing a distribution system comprising a distribution circuit breaker for each distribution line and a switch for dividing the distribution line into a plurality of sections. Providing a disconnection detection relay for detecting, a remote monitoring control device that monitors the open / close state of the switch and the operation state of the disconnection detection relay, and inputting the state information from the remote monitoring control device, and that the disconnection detection relay has been activated. Disconnection source determining means for determining a disconnection occurrence point using connection information of a distribution system, switching information of a switch, and operation information of a disconnection detection relay stored in advance under the conditions, and the disconnection source determining means
The source of the disconnection accident determined by
Power to the healthy load-side blackout section
Distribution of the switch operating procedure creating means for creating an opening and closing operation procedure of the switch until, characterized in that an opening and closing operation instruction means for executing the opening and closing operation of the switch to the remote monitor control device for System operation device.