JP3083100B2 - Automatic control method of switch in high-speed processing master station for accident point location separation system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for automatically controlling a switch in a high speed processing master station for an accident point locating and separating system, which is characterized by speeding up the disconnection.

[Conventional technology]

In general, a time-sequential feeding method is used as a method for separating an accident point in a distribution system provided with a switch. In this method, when a ground fault or the like occurs in the distribution line, the breaker is opened by the protection relay at the substation, then reclosed and reclosed to detect the fault point and disconnect the sections after the fault section. Do. In a section other than the accident section, a method is used in which the load is taken into consideration from other lines or the like by remote control of the switch or the like.

In the remote monitoring control, when a switch is controlled using a computer, the switch is executed according to a selection and control procedure called a two-action method. When controlling a plurality of switches, the next control is executed after confirming the information “on → off” that the first control is completed.

[Problems to be solved by the invention]

In such a conventional method, a power failure occurs for several tens of seconds to several minutes because the ground fault accident section is detected while the switches are sequentially turned on from the substation side.

In addition, there is a problem that a power failure in a healthy section always accompanies each accident.

Therefore, an object of the present invention is to isolate only an accident section without causing a power failure in a healthy section.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a control computer for controlling a fault point separation procedure control pattern created by a control computer one step at a time, depending on the form of the line when a ground fault occurs in a distribution line. From the master station, and based on the procedure information, the master station outputs a switch control command to the slave station, and the switching response from the slave station is returned to the control computer. In the automatic control method of the switch in the high-speed processing master station, the command from the control computer during the procedural control before the breaker of the distribution line operates by the protection relay of the substation after the occurrence of the ground fault accident In contrast, the master station returns a dummy reply to the control computer without waiting for a reply from the slave station, thereby speeding up the disconnection.

In this control method, when control of the switch fails, the master station creates a maintenance control procedure pattern based on the accident point separation procedure control pattern received from the control computer by a dummy reply, and performs maintenance control. By doing so, the time required for maintenance control can be reduced.

〔Example〕

 Hereinafter, the present invention will be specifically described based on examples.

FIG. 1 is a system diagram showing an example of a power distribution system for implementing the present invention. In this example, an optical fiber cable is used for an information transmission path in order to speed up control.
In the figure, 11 to 15 are switches, 21 to 25 are slave stations for monitoring and controlling each switch, 31 to 35 are sensors for detecting an accident point in the section,
40 is a control computer, 41 is a high-speed master station, 42 to 45 are repeaters on an optical cable transmission line, and 46 is an information transmission device installed in the A substation.

In the distribution line as shown in Fig. 1, from the first section to the third section,
Power is supplied from Substation A.

Now, when a ground fault occurs at the point of the first section, a ground fault relay (not shown) of the substation A detects the ground fault, and the information is transmitted to the control computer 40 by the information transmission device 46. You.

In addition, the ground fault information of the first section passes through the master station 41 by the slave station 21 by the ground fault detection sensor 31 provided in the No. 1 slave station 21,
The data is transmitted to the computer 40. The computer 40 determines that the ground fault has occurred in the first section, and starts controlling the high-speed master station 41 to disconnect the first section.

 The procedure is as follows.

The computer 40 issues a command to the master station 41 to turn off the No. 2 switch 12.

The master station 41 issues an "off" command for the No. 2 switch 12 to the No. 2 slave station.

The master station 41 returns a dummy change of the No. 2 switch 12 “OFF” to the computer 40.

The computer 40 issues an “ON” command for the No. 3 switch 13 to the master station 41.

The master station 41 returns to the computer 40 a dummy state change of the No. 3 switch 13 “ON”.

The computer 40 issues a command to the master station 41 to turn on the No. 4 switch 14.

The master station 41 returns to the computer 40 a dummy change of the No. 4 switch 14 “ON”.

The computer 40 issues a command to the master station 41 to turn off the No. 5 switch 15.

The master station 41 returns to the computer 40 a dummy state change of the No. 5 switch 15 “OFF”.

The computer 40 issues a “OFF” command for the No. 1 switch 11 to the master station 41.

The master station 41 returns to the computer 40 a dummy change of “OFF” of the No. 1 switch 11.

As described above, the computer 40 and the master station 41 transfer the procedure at intervals of 20 ms. After the step of the master station 41, the master station 41 controls the switch according to the instruction procedure of the computer 40 by the response of the slave station.

After the occurrence of the ground fault, information is input to the computer 40, and it takes 300 to 400 ms to start the disconnection procedure control. The time required to open and close the high-speed switch requires 100 ms including the transmission time of the slave station. The time until the accident section is separated differs slightly depending on the magnitude of the ground fault current and the quality of transmission between the master station 41 and slave station, but 800 ms in the case of the five procedures.
900900 ms, and 7 steps are required for a complicated distribution line, so the time is 1000 ms to 1100 ms.

As described above, if the cutoff time of the circuit breaker CB1 at the substation is set to be slightly longer than the above time period, the accident section can be separated without a power failure.

As a result of performing the five-step disconnection control on an actual distribution line, it was confirmed that the fault point was separated approximately 800 ms after the fault occurred. If one of the switches does not operate for any reason during the disconnection of the accident section even if the operation time exceeds the specified operation time, the master station considers that control has failed and has already received a dummy reply from the control computer. A maintenance control procedure pattern is created based on the accident point separation procedure control pattern, and maintenance control is performed reliably and quickly.

〔The invention's effect〕

As described above, in the present invention, as a response at the time of delivery of the procedure between the computer and the master station, not the reply from the slave station, but temporary data due to a dummy state change from the master station,
By processing the control with the slave station (switch) in parallel in time, the disconnection time can be shortened, and if the switch control fails, a dummy reply is already sent from the control computer. Since the maintenance control procedure pattern is created based on the received accident point separation procedure control pattern and the maintenance control is performed by itself, the time required for the maintenance control can be reduced.

The control during the disconnection procedure is not a two-action method in which a selection command is first issued to the slave station and the completion of the selection from the slave station, and then a control command is issued to the slave station, as in the prior art. Since the 1-action system in which the control command is issued directly without confirming the completion of the selection is adopted, the time has been greatly reduced.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an example of an accident point separation system for implementing the procedure control method of the present invention. 11 to 15: Sectional switch, 21 to 25: slave station 31 to 35: sensor, 40: control computer 41: high-speed master station, 42 to 45: repeater 46: information transmission device

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshihiro Yamamoto 700, Tatsuno, Oji, Mitagawa-cho, Kanzaki-gun, Kanagawa-gun, Saga Prefecture Nishim Electronics Industry Co., Ltd. Saga Plant (72) Inventor Takehiro Hayashi 2-1-1 Watanabe-dori, Chuo-ku, Fukuoka City, Fukuoka Prefecture No. 82 Kyushu Electric Power Co., Inc. (56) References JP-A-60-149240 (JP, A) Central Research Institute of Electric Power Industry Report, Research Report: T86070 "Protection control method by multipoint information of distribution system (part 2)" (1987-7), P5-9 (58) Fields investigated (Int. Cl. ⁷ , DB name) H02H 7/26 H02J 13/00 311 H04L 11/00 321 H04Q 9/00

Claims (2)

(57) [Claims] 1. When a ground fault occurs in a distribution line, a master station receives a fault point separation procedure control pattern created by the control computer one by one from the control computer depending on the form of the line. Based on the procedural information, the master station outputs a switch control command to the slave station, and the switching response from the slave station is returned to the control computer. In the automatic control method of a switch, the master station responds to the command from the control computer during the procedure control before the breaker of the distribution line operates by the protection relay of the substation after the occurrence of the ground fault. A method for automatically controlling a switch in a high-speed processing master station for an accident point locating and separating system, wherein a dummy reply is returned to the control computer without waiting for a reply from the station to speed up the disconnection. 2. When the control of the switch fails, the master station generates a maintenance control procedure pattern based on the fault point separation procedure control pattern received from the control computer by a dummy reply, and performs maintenance control. 2. The automatic control method of a switch in a high-speed processing master station for an accident point locating and separating system according to claim 1, wherein the switching is performed.