JP2527023Y2 - Accident point locator for gas insulated switchgear - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention detects an arc light generated in a closed vessel of a gas insulated switchgear (hereinafter abbreviated as GIS) with a photodetector, and an accident occurs. And an accident point locating device for locating a gas compartment.

[Conventional technology]

Abnormal light emission caused by ground faults, phase-to-phase short-circuits, circuit breaker failures, or poor contact of conductive contacts in GIS sealed containers is detected by photodetectors arranged for each gas compartment. In an accident point locator that identifies a gas compartment where an accident has occurred, in a gas compartment containing switchgear such as a circuit breaker or switch, a light detector detects switching arc light generated by opening and closing operations of the switchgear. Is detected and a signal is output. In order to avoid erroneous recognition of this signal as abnormal light emission, a determination circuit is provided on the output side of the photodetector.

FIG. 4 is a schematic cross-sectional view of a main part showing the conventional apparatus, and FIG. 5 is a time chart showing an operation state of the conventional apparatus. 4th
In the figure, the inside of a closed container 3 for accommodating a switching device 2 such as an insulating gas, a large current conductor 1 and a circuit breaker is divided into a plurality of gas compartments 5A, 5B, 5C, etc. by an insulating spacer 4. Each of the gas compartments is provided with a photodetector 8 which detects an arc discharge at the time of an accident, for example, a radiation of a ground-fault arc discharge 6 caused by a ground-fault occurring in the gas compartment 5A and converts it into an electric signal. Generates a shaped square-wave electric pulse signal 9 having a duration time of On the other hand, in case of ground fault, GI
A protection relay 13 for system protection of S generates a shaped square-wave electric pulse signal 14. The decision circuit 10 is constituted by an AND gate which receives the two signals 9 and 14 as input signals,
When both signals are input, a signal 11 that determines that an accident has occurred and notifies an abnormality is output to the alarm device 12, thereby notifying that an accident has occurred in the gas compartment 5A, for example.

On the other hand, since the protective relay 13 detects, for example, a ground fault current and supplies a contact signal 14 to, for example, a trip circuit of the switchgear 2, the switchgear 2 performs an open circuit operation to cut off the ground fault arc 6. The operation of the apparatus in this state will be described with reference to the time chart of FIG. The output signal 9W of the photodetector 8 arranged in the gas compartment 5A is a signal by radiation ground fault arc 6, time earth絡発raw time t ₁ at the same time as rising, land絡大current is interrupted t _Lasts up to ₄ . On the other hand, the protection relay 13, the time t ₁ to the time delay until after operation of detecting the ground fault T _R (hereinafter, referred to as relay time) by requiring the contact signal in the land絡後T _R has passed time t ₂ 14 occurs.

When the contact signal 14 is input to the trip circuit of the switching device 2, the switching device 2 starts to open, but the opening operation time is a time T _M during which no switching arc 7 is generated (hereinafter, referred to as opening time). Time T during which switching arc 7 is generated
_A (hereinafter, referred to as cut-off time). That is, the opening time T _M is a preparation time required to open the electrode from time t ₂ to t ₃ , and is a mechanical delay time of the operating mechanism. The interruption time T _A is a time from time t _{3 at} which the contact of the switch starts to separate to time t ₄ at which the large current is interrupted.

In the conventional device, the signal 11 indicating the abnormality is output only when both the signals 9W and 14 are present.
At time t ₂ in the example of FIG, i.e., ground fault signal 11 rises from occurs after T _R time, informing the position location of the accident is input to the annunciator 12 is performed.

On the other hand, assuming that a ground fault arc occurs in the gas compartment where the switchgear 2 is not housed, for example, 5B, and that the switchgear 2 in the gas compartment 5A performs the open circuit operation to generate the switching arc 7. The photodetector 8 arranged in the gas compartment 5A where no accident has occurred detects the opening / closing arc 7 and outputs a signal of time T _A. However, the switching device 2 has an opening time T _M , the signal 14 from the protection relay and the output signal 9W of the detector do not overlap with each other in time, and the signal 11 for reporting an abnormality is not output. Therefore, the malfunction of the photodetector 8 detecting the switching arc 7 of the switching device 2 and generating the notification signal 11 is prevented. In this case, the time chart of the output signal of the photodetector 8B arranged in the gas compartment 5B,
It is the same as Fig. 5, and the occurrence of ground fault in the gas compartment 5B is detected by the photodetector 8B arranged in the gas compartment 5B, and an alarm signal is issued. The chamber can be located depending on which gas compartment the photodetector located in operates.

[Problems to be solved by the invention]

In the conventional apparatus, an accident is determined only when a ground fault occurs in each gas compartment and the protection relay 13 detects this. Therefore, when a weak arc discharge occurs due to poor contact of the large current conductor 1 or the switchgear 2 housed in the closed container 3, the light detector 8 detects the weak arc discharge that is a precursor to this accident. Despite emitting the signal 9, there is the disadvantage that the protective relay 13 does not work and is missed.

The purpose of the present invention is to detect and locate a weak arc discharge which cannot be detected by a protective relay as well as a ground fault.

[Means for solving the problem]

According to the present invention, in order to solve the above-described problem, a closed container containing a switching device and a large current conductor is divided into a plurality of gas compartments by an insulating spacer, and a photodetector provided for each gas compartment is provided. In the case of detecting abnormal light emission in a closed container and locating the gas compartment in which abnormal light emission has occurred, a photo-electrically converted output signal of a photodetector arranged in the gas compartment accommodating the switchgear is used. A judgment circuit comprising a time limit circuit for judging that abnormal light emission has occurred in the gas compartment and outputting an alarm signal to the alarm when the duration of the reception has continued for a predetermined time exceeding the switching arc duration of the switchgear. Shall be provided.

[Action]

In the above means, the time from when the output signal of the photodetector is detected to when the determination circuit receives the output signal of the photodetector disposed in the gas compartment accommodating the switchgear to operate is determined by the switching device. Even if the photodetector detects a switching arc light of a circuit breaker and outputs a signal, for example, the timer circuit is configured by a timer circuit set to a time slightly longer than a switching arc duration (for example, a breaking time). When the timer circuit is activated by the time limit function, the switching arc has already been interrupted, so that it is possible to avoid erroneously recognizing the switching arc light as abnormal light emission. Judgment and early notification signal output without waiting for the operation signal of the protection relay, so abnormal light emission due to ground fault, short circuit between phases, or failure to shut off It is possible to reliably discriminate to broadcast the light emission by a closed arc. In addition, since the operation signal of the protective relay is not required, it is possible to detect weak arc discharge light in which the switching device does not operate, and therefore, abnormal light emission, which is a precursor of an accident such as arc discharge due to poor contact of the storage device or the like, can be detected. Can also be detected early.

〔Example〕

Hereinafter, the present invention will be described based on embodiments. FIG. 1 is a schematic sectional view of a main part of the apparatus according to the embodiment of the present invention, and FIGS. 2 and 3 are time charts showing different operation states of the apparatus according to the embodiment. In FIG. 1, an insulating gas,
Houses a large current conductor 1 and a switching device 2 such as a circuit breaker.
The inside of the sealed container 3 of the GIS is divided into a plurality of gas compartments 5A, 5B, 5C, etc. by an insulating spacer 4, and the switching device 2
A position locating device 20 is provided in the gas compartment 5A containing the circuit breaker (in the case of FIG. 1). Orientation device 20 is photodetector 8
And a judgment circuit 15 including a time limit circuit of a delay timer or a timer switch disposed on the output side thereof, and an alarm that operates by an alarm command signal 16 output from the judgment circuit 15
It is composed of 12. Also the decision circuit 15, for example the delay timer thereof to generate a notification command signal 16 when sustained predetermined time T _B time width exceeds the interruption time T _A of the circuit breaker 2, for example of the output signal 9 of the photodetector 8 The operation time is set.

FIG. 2 is a time chart showing an operation state of the locating device 20 when a ground fault arc 6 is generated on the load side of the circuit breaker 2 and the ground fault current is cut off by the circuit breaker 2. and somewhat longer time T _B than the cutoff time T _a of the circuit breaker 2 the operation time of the delay timer. Keep FIG. 2, when the ground fault arc 6 is generated at time t _1, relay time T _R of the circuit breaker 2 protection relay, opening time T _M, interruption time T
To shut off the ground fault current at time t _{4 when A} has elapsed. Thus, the electrical signal photodetector 8 time t ₁ rising ground fault arc 6 and the opening and closing arc 7 detects radiation at ground fault arc 6 has a fall time width at the time t ₄ when extinguishes 9W
Is output to the determination circuit 15. Decision circuit 15 which receives the signal 9W starts operating captures the rise of the signal 9W, a notification command signal 16W which detects that persists signal 9W is still at its operating time t ₅ rises at time t ₅ by By outputting to the alarm 12, the alarm 12 is operated to notify that abnormal light emission has occurred in the gas compartment 5 </ b> A in which the photodetector 8 is arranged. In the embodiment, since without the output signal of the protective relay, without being influenced the relay time T _R, can be detected more quickly accident.

FIG. 3 shows that in the apparatus according to the present invention, a ground fault occurs in a gas compartment where the switchgear 2 is not housed, for example, in the gas compartment 5B, the switchgear 2 of the gas compartment 5A opens and the large current circuit is opened. 6 is a time chart of the position locating device 20 corresponding to the gas compartment 5A in the case of being shut off. At time t ₁ the ground fault occurs, the output signal 9P of the photodetector 8 arranged in the gas compartment 5A the insulating spacer 4 is shielded not occur. When the protection relay operates, the switching device 2 starts the shut-off operation at time t _2, but the time t _{3 at} which the switching arc 7 is generated.
Only the rising output signal 9P of the photodetector 8 is more interruption time width T _A, is inputted to the determination circuit 15. However, the decision circuit 15
Does not last until T _B exceeds the cutoff time width T _A , so that the signal 16 does not rise and does not malfunction. In this case, the time chart corresponding to the gas compartment 5B is exactly the same as that in FIG. 2, and the occurrence of a ground fault in the gas compartment 5B is detected by the photodetector 8B.
Be informed. As described above, the device according to the present invention determines whether or not the light emission is abnormal due to the occurrence of the switching arc 7 even in the gas compartment where the switching arc 7 of the switching device 2 is generated, so that the influence of the switching arc light is eliminated. be able to.

Also, the red-hot by arc discharge or local overheating due to poor contact optical detector 8 detects the abnormal weak light, determination circuit 15 after a predetermined time T _B occurs an abnormality notification signal 16W,
Positioning is also possible. In addition to the contact failure, the switchgear 2
Galling such as by the mechanical operation mechanism, since the interruption time T _A is determined by the T _B which is determined by the model even when the sign of comprising such failure accident long, it is informed and position location of the anomaly.

[Effect of the invention]

This invention measures the duration of the internal arc light by the photodetector arranged in each gas compartment as described above, and the duration exceeds a predetermined time which is equal to or longer than the switching arc time of the switching device. In this case, an apparatus is configured to judge that the gas compartment is abnormal, and to perform abnormality notification and position locating of the gas compartment. As a result, the time limit function of the judgment circuit allows the switching arc light to be recognized as abnormal light emission without misidentifying it as abnormal light emission due to ground fault, short circuit between phases or failure to shut off. In a conventional device that detects an abnormality based on the AND condition between the operation signal of the relay and the output signal of the photodetector, a weak arc discharge that is a precursor to an accident, such as arc discharge light caused by poor contact of the conductive part of the GIS, is missed. The problem of gas insulated switchgear that excels in GIS accident location and prediction, and thus greatly contributes to the prevention of major accidents and the preparation and shortening of repair work, is eliminated. An orientation device can be provided.

Also, unlike the conventional device, the signal from the protective relay is not required, so that the signal wiring is unnecessary, and the configuration is simplified, so that a highly reliable fault locating device for a gas insulated switchgear can be provided. it can.

[Brief description of the drawings]

FIG. 1 is a block diagram of an accident point locating device including a cross section of a main part of a GIS showing an embodiment of the present invention. FIGS. 2 and 3 are time charts showing different operations in the embodiment of the present invention. The figure shows a configuration of an accident point locating device including a cross section of a main part of a GIS in a conventional device, and FIG. 5 is a time chart in the conventional device. 1 large current conductor, 2 switchgear, 3 closed container,
4 ... Insulating spacer, 5A ... Gas compartment containing switchgear, 5B, 5C ... Gas compartment without switchgear, 6 ...
Ground fault arc, 7: Switching arc, 8, 8B, 8C ... Photodetector, 9, 9W, 9P ... Output signal of photodetector, 10, 15 ... Judgment circuit, 11, 16, 16W ... Judgment circuit output signal, 12… Alarm, 13… Protective relay, 14… Protective relay output signal T _R … Relay time, T _M … Opening time, T _A … Cutoff time, T _B
... _A predetermined time exceeding T _A.

Claims (1)

(57) [Scope of request for utility model registration] An airtight container housing a switchgear and a large current conductor is divided into a plurality of gas compartments by an insulating spacer, and abnormal light emission in the airtight container is detected by a photodetector provided for each gas compartment. Receiving the photo-electrically converted output signal of a photodetector disposed in the gas compartment accommodating the switchgear, wherein the duration of the output signal is And a judgment circuit consisting of a time limit circuit for judging that abnormal light emission has occurred in the gas compartment when a predetermined time exceeding the opening / closing arc duration of the switchgear has elapsed and outputting an alarm signal to an alarm. Accident point locating device for gas insulated switchgear, characterized in that: