JP2971410B2 - Substation equipment fault location detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for detecting a fault location in a substation, switchgear, or other electric station having a double bus structure to which a gas-insulated switchgear (hereinafter, referred to as GIS) is applied when a GIS internal accident occurs. .

[0002]

2. Description of the Related Art In recent years, GISs, which have high reliability and large space saving effects, have been widely used in electric power plants. In the event that an accident such as a ground fault occurs in the GIS, a fault point was found and recovery operation was performed by patrol and investigation by a human system. Also, at some electrical stations,
An accident detection sensor is provided inside the GIS, and a device monitoring system that displays the location of the failure with the sensor when a failure occurs is introduced. However, the restoration was manually performed by human judgment.

[0003]

In the case of a GIS, the charged part is sealed in a tank filled with insulating gas. Therefore, if a ground fault occurs inside the GIS, it is difficult to specify a failure point. Time was being spent. As described above, for example, even if an equipment monitoring system that displays a fault point only with the output from the accident detection sensor is introduced, when an accident occurs, safety is emphasized, and the fault point is determined by human patrols, site surveys, etc. Since manual recovery was performed after confirmation, it took a very long time from the occurrence of the accident until recovery.

[0004] In particular, when a failure occurs in the bus portion of the GIS, the bus protection relay device operates, and all facilities including transmission lines and the like, including sound facilities, are automatically connected from the bus. Have been disconnected. This occurs because the bus protection relay device performs protection on a bus-by-bus basis, and the equipment is stopped over a wide range.
Therefore, the effect on the entire power system became extremely large, and establishing an early recovery means was an important issue.

[0005] Therefore, the present invention has been made in view of the above circumstances, when the GIS internal ground fault accident occurs, the G
Operation information of a ground fault detection sensor provided inside the IS,
By reliably identifying the failure point from the operation information of the protection relay device and quickly passing this information to subsequent restoration work, it also contributes to automatic restoration equipment etc. that can restore healthy equipment such as transmission lines in a short time It is an object of the present invention to provide a fault position detecting device for a substation equipment that performs a fault detection.

The fault position detecting device for substation equipment of the present invention comprises:
The information transmission system is configured to be connected to control system equipment and equipment monitoring system equipment in an electric substation. For example, an accident detection sensor for detecting an accident such as a ground fault is a GIS.
It is configured to be installed for each internal gas section. Thereby, the occurrence of an accident in the GIS is detected, and for example, a failure position is detected and transmitted as information for automatic recovery.

If a ground fault occurs in the GIS, bus protection relay operation information is obtained from the protection relay device via the control system device, and the operation state of the ground fault detection sensor is obtained from the device monitoring system device. Can be

In order to increase the reliability of determining an accident point from each of the above input information, on the condition that the ground fault detection sensor operates and the bus protection relay device corresponding to the installation location of the operated sensor operates. It is determined that a ground fault has occurred inside the GIS, and it is determined that the gas section where the activated ground fault detection sensor is installed is the fault point. This failure detection means has a double configuration of a ground fault detection sensor and a bus protection relay device, so that the reliability of detection is extremely high.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the fault position detecting device of the present invention is combined with an automatic recovery device will be described. The configuration of an embodiment of the present invention will be described with reference to FIG.

[0010] Distributed control devices 2-1, 2-2 to 2-n corresponding to each equipment 1-1, 1-2 to 1-n such as transmission lines, protection relay devices 3-1 and 3-
2 to 3-n and device monitoring devices 4-1 and 4-2 to 4-n are distributed. These decentralized control devices 2, a remote control device 6 that performs supervision and control from the remote control station 5, a supervision control device 7 that supervises and controls the entire electric power plant, and an operation that performs cause estimation and display of recovery guidance when an accident occurs The support device 8 and the automatic recovery device 9 are connected by a monitoring control network 10.

[0011] Further, a device monitoring device 4 for interfacing with various device monitoring sensors and a host controller,
The remote monitoring control device 6, the driving support device 8, and the automatic recovery device 9 are connected by a facility diagnosis network 11. These networks constitute a distributed control and protection system. Further, a ground fault detection sensor in the GIS is installed for each gas section, and an operation output signal is connected to the device 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 recovery device 9 when the fault position detecting device of the present invention is incorporated in the automatic recovery device. Will be described.

FIG. 2 shows a first bus 12, a second bus 13, and a second bus.
An example of a system configuration before the occurrence of an accident in a double bus 4-bus tie configuration consisting of 14 and 2 buses 15 is shown. In the figure, □ indicates a circuit breaker, ○ indicates a disconnector, and the black solid state indicates the on state.
Others indicate the OFF state. Similarly, FIG. 3 shows the system configuration after automatic recovery. In the system configuration example of FIG. 2, for example, when a GIS internal ground fault accident occurs at the fault point P16, first, the ground fault detection sensor installed in the gas section at the fault point F16 operates. As shown in FIG. 1, the operation information 17 of the ground fault detection sensor is input to the automatic recovery device 9 from each equipment 1 via the equipment monitoring device 4 and the equipment diagnosis network 11.

On the other hand, the bus protection relay device, which is one of the protection relay devices 3, detects this ground fault. In this case, due to an accident at the first bus 12, the circuit breakers 18-1 to 18-6 of all equipment connected to the first bus are tripped by the operation of the bus protection relay device. 12
Disconnect from As shown in FIG. 1, the operation information 19 of the protection relay device 3 is transmitted from each protection relay device 3 to the distributed control device 2.
To the automatic recovery device 9 via the monitoring and control network 10. In addition, system status information 20 indicating the on / off state of the circuit breaker and disconnector is input from each facility 1 to the automatic recovery device via the distributed control device 2 and the monitoring control network 10.

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 the bus protection relay device corresponding to the place where the operated sensor is installed operates (S52), it is determined that the GIS internal ground fault accident has occurred, The gas section where the activated ground fault detection sensor is installed is determined as an accident point (S53).
Next, before moving to the restoration of the sound equipment, as a restoration condition, the ground fault detection sensor of the gas section other than the accident point is not operating (S54) and the other protection relay devices are not operating (S55). That is, after confirming that no other accident has occurred, recovery processing is performed. In the example shown in FIG. 2, the transmission lines connected to the first bus 12 of the accident occurrence are A line 1 and B line.
It is two facilities of Line 1. By changing the connection of these transmission lines from the first bus 12 to the first bus 13 which is a healthy bus, the A line 1 and the B line 1 can be transmitted as before the accident, and the system can be restored. it can.

Specifically, taking the A-line No. 1 as an example,
After confirming that the bus 12 has no voltage (S56), a disconnection command is sent to the instep disconnector 21 to turn off (S57). Next, Otsu 1
After confirming that the bus 13 has a voltage (S58),
An entry command is sent out and the entry is made (S59). Finally circuit breaker 18
-1 is sent, and turned on (S60). This processing is similarly performed for other equipment, and after all equipment is restored (S61), the restoration processing ends. FIG. 3 shows the state of the system after restoration. Party 1
All the transmission lines connected to the bus 12 are switched to the Otsu 1 bus 13 and are in a healthy operation state. In FIG. 3, xx
Crosses indicate stop buses.

In addition, the control command to each of the above-described circuit breakers and disconnecting switches is provided.
As shown in FIG. 1, 23 is transmitted from the automatic recovery device 9 to each facility 1 via the monitoring control network 10 and the distributed control device 2. The synchronization test of the circuit breaker 18 is performed by the distributed control device 2
It is processed within and automatically put in.

In another embodiment, the ground fault detection sensor may be duplicated to further increase the reliability of the fault location, and the other configuration may be the same as in the above embodiment.

As described above, according to this embodiment, the GIS
As long as the internal ground fault detection sensor operates and the bus protection relay device corresponding to the installation location of the operation sensor operates, the gas classification where the operated sensor is installed is determined as an accident point, and high reliability is achieved. It is possible to perform a failure point marking with a high degree. In addition, based on the results of the fault location, it is possible to automatically restore healthy facilities such as transmission lines in a very short time of about one minute as compared with the related art. (Note that the restoration time differs depending on the accident point and the number of system facilities.) In the event of a long-term facility stoppage due to an accident in a substation, particularly a mains substation, the entire system is greatly affected, and the worst power Although it is conceivable that a supply failure may occur, the present invention prevents these problems and contributes to a stable power supply. Also, in the event of an accident at an unmanned electric station, the system can be quickly and automatically restored by linking the present invention and the automatic restoration device. In the above-described embodiment, an example has been described in which the failure position detecting device of the present invention is incorporated in the automatic recovery device 9, but it may be incorporated in the monitoring control device 7.

Further, it can be easily incorporated with a simple configuration into a distributed system to which an information transmission system such as a microcomputer and a LAN (local area network), which will be the mainstream of a control and protection system for electric power stations in the future, is applied. Yes, the effect is great.

[0021]

As described above, according to the present invention, extremely reliable fault location can be performed using the operation information of the ground fault detection sensor in the GIS and the operation information of the bus protection relay device. To the automatic recovery device,
It is possible to 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 recovery device incorporating a failure position detection device of the present invention,

FIG. 2 is a system configuration diagram before the accident,

FIG. 3 is a system configuration diagram after automatic restoration,

FIG. 4 is a processing flow of an automatic restoration device incorporating the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Transformation equipment 2 ... Distributed control device 3 ... Protection relay device 4 ... Equipment monitoring device 6 ... Remote monitoring control device 7 ... Monitoring control device 8 ... Operation support device 9 ... Automatic recovery device 10 ... Monitoring control network 11 ... Equipment diagnosis Network 17: Ground fault detection sensor operation information 19: Protection relay device operation information 20: System status information 23: Control command

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) H02J 13/00-13/00 311 G01R 31/08 H02H 5/00 H02H 7/26

Claims (1)

(57) [Claims] 1. Fault location of substation equipment consisting of a plurality of gas classes
In置検sensing device, a first input means for inputting the operation information from a plurality of fault detection sensor provided respectively for each of the gas division, setting the fault detection sensor and protected the substation facilities
Second input means for inputting operation information from a protection relay device provided corresponding to the location, an accident detection sensor operates based on the operation information input by both input means, On the condition that a protection relay device that protects a gas section provided with a sensor has been operated, a determination unit that determines the gas section as a failure position is provided, and an output unit that outputs a determination result of the determination unit is provided. A fault position detecting device for a substation facility.