JP2672682B2 - Automatic recovery device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to an electric station such as a substation or switch station having a double busbar structure to which a gas-insulated switchgear (hereinafter referred to as GIS) is applied. GIS related to automatic recovery equipment when an internal accident occurs.

(Prior Art) In recent years, GIS, which is highly reliable and has a large space-saving effect, has been widely adopted in electric power plants. Should an accident such as a ground fault occur in this GIS, a failure point was found and a recovery operation was carried out by a human system patrol and investigation. In addition, some electric stations have an accident detection sensor inside the GIS, and a device monitoring system that displays the fault location by the sensor when a fault occurs is introduced, but at the time of restoration, it is manually operated by human judgment. It was done.

(Problems to be solved by the invention) Since the charging part of GIS is sealed in a tank filled with insulating gas, in the unlikely event of a ground fault,
It was difficult to identify the point of failure, and a lot of time was spent.
As described above, for example, even if a device monitoring system that displays a failure point is installed, safety is emphasized when an accident occurs, and manual recovery is performed after confirming the failure point through human patrols, site surveys, etc. Therefore, it took a very long time to recover from the accident.

In particular, when a failure occurs in the bus bar of the GIS, the bus protection relay device operates and all equipment including the power transmission line, including sound equipment, is automatically disconnected from the bus. There is. This occurs because the busbar protection relay device protects busbar units.
The equipment will be stopped over a wide area. Therefore, the impact on the entire power system becomes extremely large, and the establishment of means for early recovery was an important issue.

Therefore, the present invention has been made in view of the above circumstances, and when an GIS internal ground fault accident occurs, failure occurs from the operation information of the ground fault detection sensor provided inside the GIS and the operation information of the protection relay device. The purpose is to identify a point, create a restoration procedure based on this information, and provide an automatic restoration device that restores sound equipment such as a transmission line in a short time [Configuration of the invention] (Solving the problem Means) The automatic restoration device of the present invention has a configuration in which it is combined with a control system device and a device monitoring system device in an electric station in an information transmission system. In addition, the ground fault detection sensor is installed for each gas segment in the GIS. This allows GIS
Detects the occurrence of an accident in the company and sends control commands for information acquisition and recovery for automatic recovery.

(Operation) If a ground fault occurs in the GIS, the protection relay device can obtain the busbar protection relay operation information via the control system device, and the ground fault detection sensor operation status can be confirmed by the device monitoring system device. can get. Furthermore, system status information such as on / off of each circuit breaker and disconnector can be obtained from the control system device. In addition, the occurrence of an accident is detected, the busbar protection relay device is activated, and all equipment connected to the failed busbar is disconnected.

In order to increase the reliability of accident point determination from the above force information, the ground fault detection sensor operates and the busbar protection relay device corresponding to the installed location of the operated sensor operates on the condition that the GIS internal Judging that a ground fault occurred,
It is confirmed that the gas category where the activated ground fault detection sensor is installed is the accident point. The failure detection means has a dual structure of a ground fault detection sensor and a busbar protection relay device, so that the reliability of detection is very high.

Next, after confirming the accident point, create a procedure for changing the connection of each circuit breaker and disconnector after the accident to the sound busbar, such as the transmission line that was connected to the faulty busbar. By automatically sending a control command to each device via the control system, it is possible to automatically restore the system in a short time.

(Embodiment) A configuration of an embodiment of the present invention will be described with reference to FIG.

Distributed control devices 2-1 and 2-2 to 2-n corresponding to respective installation parts 1-1, 1-2 to 1-n such as power transmission lines, and protection relay device 3-
1,3-2 to 3-n and device monitoring device 4-1,4-2 to 4-n
Are distributed. These distributed control device 2, distant monitoring control device 6 that performs monitoring control from distant control station 5, monitoring control device 7 that performs monitoring control of the entire electric station, and operation that performs cause estimation and restoration guidance display in the event of an accident. Support device 8,
The automatic restoration device 9 is connected by the monitoring control network 10.

Further, various equipment monitoring sensors, a equipment monitoring device 4 for interfacing with a host control device, a distant monitoring control device 6, a driving support device 8, and an automatic restoration device 9 are connected by a facility diagnosis network 11. . These networks form a distributed control and protection system. Further, the ground fault detection sensor in the GIS is installed for each gas section, and the operation output signal is connected to the equipment monitoring device 4.

Next, the operation of the embodiment will be described with reference to FIGS. 2 and 3 showing the system configuration diagram and FIG. 4 showing the processing flow of the automatic restoration apparatus 9 of the present invention.

Figure 2 shows Ko 1 bus 12, Otsu 1 bus 13, Ko 2 bus 14, Otsu 2
An example of the system configuration of the double busbar 4 bus tie configuration consisting of the busbar 15 before the accident occurs is shown. Also in the figure Indicates a circuit breaker, ○ indicates a disconnecting switch, a black solid state indicates an on state, and the others indicate an off state. Similarly, FIG. 3 shows the system configuration after automatic restoration. In the system configuration example of FIG. 2, for example, considering a case where an GIS internal ground fault occurs at the accident point F16, first, the ground fault detection sensor installed in the gas section at the accident point F16 operates. The operation information 17 of this ground fault detection sensor is as shown in the flow of information in FIG.
It is input from each facility 1 to the automatic restoration device 9 by relaying each device monitoring device 4 and facility diagnostic network 11.

On the other hand, the busbar protection relay device, which is one of the protection relay devices 3, also detects this ground fault. In this case, because of an accident at the A1 bus 12, the busbar protection relay device operates to disconnect the circuit breakers 18-1 to 18-6 of all the equipment connected to the A1 bus, and the A1 bus. Separate from 12. As shown in FIG. 1, the operation information 19 of the protection relay device 3 is transferred from each protection relay device 3 to the distributed control device 2 and further input to the automatic restoration device 9 via the supervisory control network 10. Further, the system state information 20 indicating the on / off state of the system breaker and disconnector is provided from each facility 1 via the distributed control device 2 and the monitoring control network 10.
Input to the automatic restoration device.

Next, a recovery process performed by the automatic recovery device 9 based on the input information will be described with reference to FIG. First, when the ground fault detection sensor operates (S51), and when the busbar protection relay device corresponding to the location where this operated sensor is installed operates (S52), it is determined that a GIS internal ground fault accident has occurred, The gas category in which the activated ground fault detection sensor is installed is determined as the accident point (S53). Next, as a recovery condition before moving to the recovery of sound equipment, the ground fault detection sensor of the gas classification other than the accident point is not operating (S54) and the other protective relay device is not operating (S55). ) That is, the recovery process is performed after confirming that no other accident has occurred. In the example shown in Fig. 2, the first busbar of the accident occurred
The transmission lines connected to 12 are 2 of A line 1 and B line 1
Equipment. By changing the connection of these power transmission lines from Ko 1 bus 12 to Otsu 1 bus 13 which is a sound bus, A line 1 and B line 1 can be transmitted and the system can be restored as before the accident. it can.

Specifically, taking A line No. 1 as an example, after confirming that there is no voltage on the instep 1 bus 12 (S56), a disconnection command is sent to the instep disconnector 21 to disconnect it (S57). ). Next, after confirming that the Otsu 1 bus bar 13 has a voltage (S58), the ON command is sent to the Otsu disconnector 22 to turn it on (S59). Finally, the ON command is sent to the circuit breaker 18-1 to be ON (S60). This processing is similarly executed for other equipment, and after the restoration of all equipment (S61), the restoration processing ends. Figure 3 shows the state of the system after restoration. Instep 1 Bus 12
All of the transmission lines that were connected to Otsu 1 bus 13 are switched to a healthy operating state. In FIG. 3, the mark XXX indicates a stop bus bar.

As shown in FIG. 1, the control command 23 to each of the above circuit breakers and disconnecting switches is sent from the automatic restoration device 9 to each facility 1 through the supervisory control network 10 and the distributed control device 2. Further, the synchronization verification of the circuit breaker 18 is processed in the distributed control device 2 and automatically turned on.

As another embodiment, the ground fault detection sensor may be doubled in order to further increase the reliability of fault location, and the other configurations may be the same as those of the above embodiments.

As described above, according to the present embodiment, the gas installed in the operated sensor is provided on condition that the ground fault detection sensor in the GIS operates and the busbar protection relay device corresponding to the installation location of the operation sensor operates. By determining the classification as an accident point, a highly reliable failure point control point becomes possible. In addition, it is possible to automatically restore a healthy facility such as a power transmission line in a very short time, which is about 1 minute, based on the above-mentioned fault point localization result, which is about 1 minute. (In addition, the recovery time depends on the accident point and the number of system facilities.) If the facility is stopped for a long time due to an accident in an electric power plant, especially an accident at a backbone electric power plant, the entire power system is greatly affected and the worst power Although this may lead to a supply failure, the present invention prevents these problems and contributes to stable power supply. In addition, even in the case of an accident at an unmanned electric station, the system can be quickly and automatically restored by the present invention.

Furthermore, it can be easily incorporated with a simple configuration into a distributed system that applies information transmission systems such as microcomputers and LANs (local, area, network), which will be the mainstream of control and protection systems for electric stations in the future. , Its effect is great.

[Effects of the Invention] As described above, according to the present invention, it is possible to locate a fault point with extremely high reliability by using the operation information of the ground fault detection sensor and the operation information of the busbar protection relay device in the GIS. As a result, Therefore, it is possible to obtain an automatic restoration device that can automatically restore the system in a short time.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of an electric station including an automatic restoration device of the present invention, FIG. 2 is a system configuration diagram before an accident, FIG. 3 is a system configuration diagram after automatic recovery, and FIG. 4 is an automatic system according to the present invention. It is a processing flow of a recovery device. 1 ... Substation equipment, 2 ... Distributed control device, 3 ... Protection relay device, 4 ... Equipment monitoring device, 6 ... Distance monitoring control device, 7 ... Monitoring control device, 8 ... Driving support device, 9 ... Automatic Restoration device 10 …… Monitoring control network 11 …… Facilities diagnosis network 17 …… Ground fault detection sensor operation information 19 …… Protection relay device operation information 20 …… Grid system status information 23 …… Control command

Claims (1)

(57) [Claims] 1. A first means for inputting operation information of an accident detection sensor provided inside a substation equipment and operation information of a protective relay device of the substation equipment via a transmission system to identify a failure occurrence position, and before the occurrence of an accident. An automatic restoration device comprising: a second procedure for creating a restoration procedure from the system state information after the occurrence of the accident and the failure occurrence position information of the first means to perform a restoration operation of the target device.