JPH01315230A - Method of monitoring reclosing operation - Google Patents

Abstract

PURPOSE:To correctly monitor irrespective of a high speed reclosing by discriminating the success/failure of a reclosing operation by reclosing with a processor provided at the previous stage of a remote monitoring device, a member station, and transmitting only its discriminated result to the centralized monitoring device of a general control place of a host system through a remote monitoring device. CONSTITUTION:If trouble occurs at a power distribution line F1, a process is judged by a processor D with a state change of a protective relay, such as an over-current relay OCR1. That is, whether a switch CB1 is opened or not is discriminated, if it is closed, a sampling discrimination in a member station TCA is repeated, while if the switch CB1 is opened to be judged as an open state, whether a reclusion relay Rec1 is operated or not is judged. If the relay Rec1 is operated, a timer is started, the incremental operation of the timer is started, and the switch CB1 is then closed. Thus, whether it is closed or not is judged. If the switch CB1 is closed, the success of the reclosing is judged, and the judged result is transmitted to a centralized monitoring device S.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a reclosing operation monitoring method for intensively monitoring the high-speed reclosing operation of a distribution line switch when an instantaneous fault occurs in a distribution line of a power system.

B1 Summary of the Invention Information regarding distribution line breakers and reclosing relays is transmitted from multiple distribution substations to a centralized monitoring and control device in a host system/control center via a remote monitoring and control device (remote control device). In order to centrally monitor the re-closing operation of switches when a power line accident occurs, a processing device is installed in front of the remote control device and slave station of the distribution substation, and the re-closing detection process is performed based on the input operator blue report. By determining the success or failure of high-speed reclosing operation and transmitting this judgment information to a central monitoring device to monitor the reclosing operation, it is possible to detect delays caused by the transmission path, transmission timing deviations (synchronization deviations), etc. This is a re-closing operation monitoring method that prevents false judgments.

C1 Conventional technology Most accidents on power distribution lines are caused by instantaneous contact with trees or animals, so by retransmitting power after a certain period of time, power can be transmitted without abnormalities and long-term supply interruptions can be avoided.

For this reason, reclosing relays are installed at distribution line outlets at distribution substations to improve supply reliability.

Recently, there are cases in which monitoring of these reclosing controls is performed by a substation centralized monitoring and control device in the upper system. At this time, the opening/closing information of the distribution line switch of the distribution substation and the operation information of the re-closing relay are individually input to the remote control device/slave station of the substation, and the transmission section transmits the information to the transmission signal. and send it to the transmission path. The remote control device/master station of the upper system/control center connected to this transmission path receives the transmission signal and restores it to the original information, and then inputs it to the central monitoring and control device, which then recloses the information. Detection processing is performed to monitor the success or failure of re-closing operation.

D8 Problems to be solved by the invention However, there is a difference in the transmission timing (synchronization difference) between the switching information of the distribution line switch and the information of the re-closing relay, which are detected and transmitted individually, and there is a delay in the transmission path. , when performing high-speed reclosing operation, the third
As the time chart in the figure shows, the open/closed status of the switch cannot be detected at the time of sampling when the transmission section of the remote control device/master station acquires information, and the centralized monitoring and control device cannot properly monitor the switch. A problem arises.

The present invention has been made in view of the above-mentioned drawbacks, and includes a processing device provided in the front stage of the slave station, and is capable of successfully performing a reclosing operation based on operation information of a reclosing relay and opening/closing information of a switch to be reclosed. It is an object of the present invention to provide a method for accurately monitoring a high-speed reclosing operation by performing a failure determination process and transmitting the determination result to a higher-level centralized monitoring and control device.

E1 Means and Function for Solving Problems The present invention provides information regarding distribution line breakers and reclosing relays from a plurality of distribution substations to remote monitoring and control devices (remote control devices), slave stations, and host systems/control stations. The remote control device/master station of the distribution substation centrally monitors the reclosing operation of the distribution line switch in the event of a distribution line fault by transmitting data to the central monitoring control device via the remote control device/master station of the distribution substation. A processing device is installed in front of the station to input the distribution line switch and re-closing relay information, and when a distribution line fault occurs, the re-closing detection process of the distribution line switch is performed based on the input information, and the high speed of the distribution line switch is increased. A method of determining the success or failure of a reclosing operation, transmitting this determination information from the slave station and inputting it to the central monitoring and control device via the master station, and monitoring the high-speed reclosing operation status of a distribution line switch. It is.

F. Embodiment Next, an embodiment of the present invention will be described based on the block diagram of a substation centralized monitoring and control system shown in FIG. 1 and the reclosing circuit 70-chard shown in FIG.

In FIG. 1, M is a general control center that can centrally monitor a plurality of control centers, and is composed of a substation centralized monitoring and control device S that is configured with a CPU and centrally monitors a plurality of power distribution substations. In addition, L is the control center and remote control master station TCM that transmits information.
Consisted of.

Further, A, B, and C are respectively distribution substations. Distribution substation A,,L, has two system lines, CBl+CB,
and DS, , Dst are switches and new line switches installed in each line, L,. Ls,,'LS.

is line L1. It is a line switch that connects L2, and T
A, TB, and Tc are transformers that supply power to secondary lines BA, Ba, and Be, and D SA, D SB, and D S
C is a transformer secondary disconnector. Furthermore, CB, ~CBn and DS, -DS,l,,DS,2~DS□ are the above-mentioned 2
Distribution lines F, ~F7 connected to the next bus B^, Be, Be
These are distribution line switches and disconnectors installed in Also C
T, ~CT, are overcurrent protection relays OCR.

~OCR, is a current transformer that takes in the line current to ZCT
, ~ZCT, are zero-sequence current transformers that detect the zero-sequence current that operates the ground fault direction relays DGRI to DGRn and the recloser relay RSCl "'-Rmen. Also, TCA,
TCB and TCC are remote control slave stations for information transmission installed in each distribution substation, D is a processing device installed before the slave station, and distribution line switches CB and ~CB in each substation, respectively.
, and the information on the recloser relay Rse l ""' Rm
The information of en is input, and the re-closing detection process is performed to determine whether the re-closing operation is successful or unsuccessful. Further, L^, La, and Lc are information transmission paths connecting the remote control/master station TCM and each of the slave stations TCA, TCB, and TCC.

Next, the operation of this embodiment will be explained with reference to the reclosure detection flowchart of FIG. 2. When an accident occurs in the metal wire Fl and a change in the state of a protective relay, such as an overcurrent relay OCR, occurs, the flowchart is activated and a processing determination is performed in the processing device. That is, the switch CB in step SI.

It is determined whether or not the switch CB is in the open state, and if it is in the closed state, the sampling judgment by the slave station TCA is repeated, and when the relevant switch CB is cut off and determined to be in the open state, the step moves to S, and the relevant repeat It is determined whether the closing relay R*cl has operated. While the relay Rac I is not operating, the flow is repeated from step S1 to step S. When the re-closing relay R8,, 1 operates in step S, the process moves to step s3, the timer is started and the timer starts to advance, and then it is determined in step S3 whether or not the switch CB is turned on and is in the closed state. It is determined in S4. Said switch C
If B is in the closed state, it is determined in step S6 that the re-closing has been successful, and the detection operation ends.

However, in step S4, if the switch CB is still in the open state without being closed, the flow advances to step S. If the timer is in a time-up state in step S, it is determined in step 7 that the reclosure has failed. However, if the timer has not timed up in step 5, the flow returns to step S.

The process returns to step S, and the determination is repeated again at step S.
Successful reclosing or failure of reclosing is determined based on the determination results in each case, and this information is transmitted to the transmission line LA.
The data is transmitted to the remote control master station TCM at the control center, and then input to the central monitoring and control device S, where the accurate system status of each distribution substation is grasped and correct reclosing operation is performed even during high-speed reclosing. monitoring becomes possible.

Effects of the G1 Invention As is clear from the above explanation, the present invention enables a processing device installed in front of a remote control device/slave station in a distribution substation to process information input to a distribution line switch and a re-closing relay. The reclosing detection process is performed to determine the success or failure of the reclosing operation, and only the determination result is transmitted via the remote control device to the central monitoring and control device of the upper system general control center to monitor the reclosing operation. This method has the extremely effective effect of not making erroneous judgments based on transmission delays or synchronization deviations and performing correct monitoring despite high-speed reclosing.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a substation centralized monitoring and control system showing an embodiment of the present invention, FIG. 2 is a reclosing flowchart, and FIG. 3 is a time chart when performing a high-speed reclosing operation. M... General control center, A, B, C... Distribution substation,
S...Substation centralized monitoring and control equipment, TCM and TCA
, TCB, TCC... Remote control/master station and slave station, LI. 1-t...System line, CB, CBt and D S
,,DS! ...Line switch and new line switch, LS
,,LS,...Line switch for line connection, BA,
BB, Be...Secondary bus bar, TA, TB, Tc...
Transformer, DSA, DSa. D S c...Transformer secondary disconnector, F,, Fn...
Distribution line, CB, ~CBn and D S +t, D S
n+, D S It ~ DS0... Distribution line switch and disconnector, CTl-CTn... Current transformer, OCR, ~
0CRn...Overcurrent protection relay, ZCT, ~ZCT,
--Zero-phase current transformer, R*eI to R*cn'...Reclosing relay, D...Processing device, LA, La, Lc...Information transmission line. Figure 2: Reclosing flowchart Figure 3: Time chart

Claims (1)

[Claims] (1) Information regarding distribution line switches and reclosing relays from multiple distribution substations is sent to the centralized monitoring and control equipment of the general control center via the remote monitoring and control equipment/slave stations and the upper system/control center's master station. In a device that centrally monitors the re-closing operation of a distribution line switch in the event of a distribution line fault, a processing device is installed before the remote monitoring control device/slave station of the distribution substation to monitor the distribution line switch and re-closing operation. Closing relay information is input, and when a distribution line accident occurs, reclosing detection processing of the distribution line switch is performed based on the input information, and the success or failure of the high-speed reclosing operation of the distribution line switch is determined, and the determination information is A reclosing operation monitoring method characterized in that the reclosing operation status of a distribution line switch is monitored by transmitting it from the slave station and inputting it to the central monitoring and control device via the master station.