JP2856543B2 - Distribution line automation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Industrial Application Field) The present invention relates to a distribution line automation device for minimizing a power outage area when a distribution line failure occurs.

(Prior Art) FIG. 3 is a conceptual diagram of a distribution system. In the figure, 20
Is a substation, 21 is a bus, 22 is a circuit breaker, 23 is a distribution line fault current detection CT, 24 is a protection device (RY), and 25a to 25c are accident detectors. In the system connected to the bus 21, the section between the circuit breaker 22 and the accident detector 25a is defined as one section, the section between the accident detectors 25a and 25b is defined as two sections, and so on.
The interval from to 25c is defined as three sections.

Now, assuming that a fault has occurred in the distribution line in the three sections, the protection device is detected by the signal detected by the fault current detection CT23.
24 responds and opens the circuit breaker 22 to disconnect the system from the bus 21 once.

Thereafter, after a short time of 1 minute or 30 seconds (generally referred to as a reclosing time), the protective device 24 turns off the circuit breaker 22.
, The first section is charged. The accident detector 25a monitors the voltage of one section and detects that one section is charged and the voltage rises. After a short time period of 7 seconds or 9 seconds after the detection, the accident detector 25a
Closes the section switch and charges two sections. Hereinafter, the sorting switch is closed by the operation of the accident detector 25b.
If the failures in the three sections have recovered at that point, the charging in the three sections is performed without abnormality.

Also, if the failure in three sections has not recovered at that time,
The protection device 24 reacts again with the signal detected by the fault current detection CT 23, opens the circuit breaker 22, disconnects the system from the bus, and locks the accident detector 25b so that it will not operate even if it is charged next time. I do. Thereafter, in the same manner, the protection device 24 turns on the circuit breaker 22 at a short time of 1 minute or 30 seconds (generally referred to as a re-close circuit time) to charge one section first. The accident detector 25a monitors the voltage of one section and detects that one section is charged and the voltage rises. After a short time period of 7 seconds or 9 seconds after the detection, the accident detector 25a closes the sectional switch and charges two sections. However, after that, the above-mentioned accident detector 25b
Is locked so that it does not operate, so that the closing operation is not performed. Therefore, the third section and the subsequent sections are separated as a failure section, and thereafter, a power failure occurs until recharging (manual operation) after inspection and repair of a failure portion of the distribution line.

(Problems to be Solved by the Invention) As described above, in the related art, when a failure occurs in the distribution line, the circuit breaker of the substation is always opened. For this reason, in the case of a faulty distribution line, a power outage always occurs in areas other than the faulty section by opening the circuit breaker.

The present invention has been made in order to solve the above-described drawbacks, and it is an object of the present invention to provide a distribution line automation device which does not cause a power failure in a section on a power supply side from a failure point when a distribution line failure occurs.

[Configuration of the Invention] (Means for Solving the Problems) In order to achieve the above object, in the present invention, a distribution line divided into a plurality of sections by a segmented switch is connected to a transmission line from a master station by a multi-drop method. In the connected distribution line automation equipment, the master station at the substation terminal station constantly monitors the state (ON, OFF) of the segment switch in each slave station by polling,
Means for storing the system status in the logic unit based on the setting status of the system setting unit, and fault information detected by the fault current detection units of the slave station and the master station when a fault occurs, respectively, is taken into the master station, and the fault feeder and the A means for extracting the switched-on segment switches in the feeder, and a data return request from the master station to the slave station of the extracted switched-on switches being switched on,
Means for determining a fault section in the master station from data returned from the slave station of each of the segmented switches and data of the distribution line operation state stored in the logic unit in advance, and a power source side from the fault section. Means for opening the breaker of the substation earlier than the opening operation of the circuit breaker of the substation.

(Operation) In the above configuration, for example, when a ground fault occurs in a distribution line, a fault detection unit in a slave station of the distribution line detects the ground fault. Further, the distribution line failure is detected by the distribution line failure high-speed detection unit of the substation. Based on the detection signal of the distribution line fault high-speed detection unit at this substation, the master station uses the data on the operation status of the distribution line to select the switchgear that is connected to the distribution line from the slave stations that are multi-connected to the communication line. The transmission unit collects information of the distribution line failure detection unit from among the slave stations in which the is ON. Based on the collected data, the logic section of the master station determines the failure section, and issues an opening command to the slave station on the power supply side of the failure section earlier than the opening of the circuit breaker at the substation.

(Example) Hereinafter, an example is described with reference to drawings.

FIG. 1 is a functional block diagram of a distribution line automation device according to the present invention.

In FIG. 1, reference numeral 1 denotes a master station; 24 ', a high-speed distribution line fault detecting section at the substation side; 2, a receiving section for receiving a signal from the high-speed distribution line fault detecting section 24'; 4 is a logic section, which is a logical section, based on the information of the system setting section 3 and the information on the state (ON, OFF) of the section switch from each slave station. , The failure section is determined based on the information of the detector 9 described later from each slave station, and an open command is issued through the slave station of the section switch on the power supply side of the failure section on the power supply side. Make logical decisions. 5 is a transmission unit for transmitting information to the slave station, 6 is a transmission line, 26a to 26c are segmented switches, 25a 'to 25c' are slave stations, 7 is a fault current detection CT for detecting distribution line faults, 8a, 8b is a transformer for the control power supply of the slave station (omitted for the section switches 26a and 26c) 9 is a fault detection section for detecting the presence or absence of a fault by an input signal from the fault current detection CT 7 (omitted for the section switches 26a and 26c) , 10 is a transformer,
8a, 8b and an input / output interface section with the segmented switch 26b (the segmented switches 26a, 26c are omitted). Reference numeral 11 denotes a slave station transmission unit for exchanging signals with the new station, and reference numeral 12 denotes a slave station logic unit for controlling the section switch 26 based on the signal of the slave station transmission unit 11.

Next, the operation of the embodiment of the present invention configured as described above will be described below.

The distribution line branches off from the bus 21 of the substation 20 and supplies power to the distribution line via the CB 22. The distribution system is configured by combining many such distribution lines. These power distribution systems are connected in a multiplex manner via a logic unit 4, a transmission unit 5, and a transmission line 6 of the master station 1, collect a large number of slave station information by polling at all times, and check the state (open or open) of the segment switch. Monitoring. The information collected in this way is stored in the logic unit 4 as the current distribution system based on the setting state of the system setting unit 3.

In such a state, if a ground fault occurs at the point F of the distribution line, the fault current detection unit CT23 detects this. This information is taken in by the receiving section 2 of the master station 1 via the distribution line fault speed detecting section 24 '.

The operation of the logic unit 4 will be described below with reference to FIG. 2 showing a system operation flowchart.

In the logic unit 4, the processing unit 31 limits the failure feeder based on the information of the receiving unit 2. The processing unit 32 fetches the data stored in the logic unit 4 based on the information of each of the sorting switches previously collected by the polling at all times and the setting state of the system setting unit 3, and performs the sorting and opening during the feeding of the corresponding feeder. Extract the container. The processing unit 33 issues a data return request via the transmission unit 5 and the transmission line 6 to the relevant slave station of the extracted segmented switch. Applicable slave station that received the data return request (here 25b)
Is operated by the slave station logic unit 12 with a signal from the slave station transmission unit 11,
Based on the information of the fault current detection CT7, the information of the detection unit 9 for detecting a fault is returned to the master station 1 via the slave station transmission unit 11 and the transmission path 6. On the basis of the collected data of the slave stations that have been put in the faulty feeder in this way, the processing unit 34 determines the faulty section by using the distribution line operation state data stored in the logic unit 4. The processing unit 35 transmits an opening command to the slave station 25b on the power supply side from the fault point F of the faulty feeder, and the slave station 25b
, The sectional switch 25b is opened.

[Effects of the Invention] As described above, according to the present invention, when a ground fault has occurred, the detection unit is provided on the master station side and the slave station side. Thus, the sectional switch on the power supply side from the point of failure can be opened. This operation is performed at high speed, and processing is performed before the circuit breaker is opened in response to the protection device at the substation side, so that the faulty point can be eliminated by opening the sectional switch, and the circuit breaker is not opened. Therefore, a power failure does not occur in a healthy area on the power supply side from the distribution line failure point.
As a result, even if a ground fault occurs, it is possible to minimize the power outage and to significantly improve the reliability of power supply.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of a distribution line automation device according to the present invention, FIG. 2 is a flowchart of a system operation, and FIG. 3 is a conceptual diagram of a distribution system. DESCRIPTION OF SYMBOLS 1 ... Master station apparatus, 2 ... Reception part, 3 ... System setting part 4 ... Logic part, 5 ... Transmission part, 6 ... Transmission path 7,23 ... Fault current detection CT, 8a, 8b ... ... Transformer 9 ... Detector, 10 ... I / O interface unit 11 ... Slave station transmission unit, 12 ... Slave station logic unit, 20 ... Substation 21 ... Bus, 22 ... Circuit breaker, 24 ... Protector 24 '… Distribution line fault high-speed detector, 25a, 25b, 25c …… Investigator 25a', 25b ', 25c' …… Slave station, 26a, 26b, 26c …… Segment switch

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-1-291630 (JP, A) Kenji Yukihira, two outsiders “Protection control method based on multipoint information of distribution system (part 2)-by system recognition method Operation algorithm-"Report of the Central Research Institute of Electric Power Industry, Central Research Institute of Electric Power Industry, July 1987, Research Report: T86070 (58) Field surveyed (Int. Cl. ⁶ , DB name) H02J 13/00-13 / 00 311 H02H 7/26

Claims (1)

(57) [Claims] 1. A distribution line automation device in which distribution lines divided into a plurality of sections by a division switch are connected to a transmission line from a master station in a multi-drop manner, wherein a master station at a substation terminal station always polls. Means for monitoring the state (ON, OFF) of the segmented switch in each slave station and storing the system status in the logic unit based on the setting status of the system setting unit; The fault information detected by the fault current detection unit of each of the above is taken into the master station, a fault feeder and a means for extracting the switched-on sectional switches in the feeder, and the extracted switched-on switches of the switched-on switches. A data return request is sent from the master station to the slave station, and the data returned from the slave station of each of the segmented switches and the distribution line operation state data stored in advance in the logic unit are sent to the master station. Means for determining a failure section by Against section switch with more disabled section to the power supply side, the distribution line automated apparatus being characterized in that a means for opening earlier than the opening operation of the breaker of the substation.