JPH08140231A - Fault detector for gas insulated electric facility - Google Patents

Abstract

PURPOSE: To entirely enhance the sensitivity of detecting arc light by reducing the arc light detecting sensitivity difference with the fault position. CONSTITUTION: A solar cell 4 is installed with a light receiving surface directed toward the center of a tank 2 in the hand hole 3 of the tank 2 in which a main circuit conductor 1 is contained and insulating gas is sealed, and arc light 5 generated by a fault such as short-circuit, the ground-fault of the conductor 1 in the tank 2 is detected by the cell 4. The output signal of the cell 4 is led to the exterior of the tank 2, a light emitting diode 6 is driven to emit light, which is transmitted to a judging unit 8 via an optical fiber 7, and the fault in the tank 2 is detected according to the presence or absence of the incidence of the light from the fiber 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an accident detection of a gas-insulated electric equipment for detecting an accident such as a short circuit or a ground fault which occurs in a gas-insulated electric equipment such as a gas-insulated switchgear used as a power receiving and transforming equipment. It is related to vessels.

[0002]

2. Description of the Related Art As shown in FIG. 2, a conventional accident detector for gas-insulated electrical equipment is equipped with a tank 21 of a gas-insulated switchgear.
A hole is made in the wall surface of the condenser lens 22 so that the inside can be seen.
Is attached airtightly, and the arc light 24 generated by an accident such as a short circuit of the main circuit conductor 23 inside the tank 21 or a ground fault is condensed by this condenser lens 22, and one end is opposed to the condenser lens 22. The optical fiber 25 is used for transmission to the determination device 26. The determination device 26 uses the optical fiber 2
The presence / absence of an incident inside the tank 21 is determined by the presence / absence of incident light from No. 5.

The determining device 26 specifically determines an optical / electrical converter (O / E) 27 for converting the light transmitted through the optical fiber 25 into an electric signal, and an output signal of the optical / electrical converter 27. It is composed of an amplifier 28 that amplifies, and a determination unit 29 that determines whether or not the arc light 24 is generated in the tank 21 by comparing the output of the amplifier 28 with a predetermined threshold value.

According to the accident detector of this gas-insulated electric equipment, when an arc light 24 is generated due to an accident such as a short circuit or a ground fault in the tank 21, the arc light 24 is focused by the condensing lens 22.
Are collected and transmitted by the optical fiber 25 to the determination device 26. In the judging device 26, the light transmitted through the optical fiber 25 is converted into an electric signal by the optical / electrical converter 27, further amplified by the amplifier 28, and then compared with the threshold value by the judging unit 29. When an accident occurs, light is transmitted through the optical fiber 25, the level of the output signal of the amplifier 28 exceeds the threshold value, and the determination unit 29 determines that an accident has occurred.

[0005]

SUMMARY OF THE INVENTION In the above-mentioned conventional example,
Since the light collecting area by the light collecting lens 22 is small and thus the light receiving range is narrow, an accident may occur due to the mounting position of the light collecting lens 22, the directivity of the light collecting lens 22, the shape of the tank 21, the arrangement of the main circuit conductor 23, and the like. Arc light for position 24
There was a large difference in the detection sensitivity of, and in some cases it could not be detected depending on the accident location and the appearance of the accident.

Therefore, an object of the present invention is to provide an accident detector for gas-insulated electrical equipment, which can reduce the arc light detection sensitivity difference depending on the accident position and can enhance the arc light detection sensitivity as a whole. Is.

[0007]

An accident detector for gas-insulated electrical equipment according to the present invention has a light-receiving surface directed toward the center of the tank inside a handhole of a tank containing an electric device and containing an insulating gas. It consists of a solar cell installed and the output signal led to the outside of the tank.

[0008]

According to the structure of the present invention, a short circuit occurs inside the tank,
When an accident such as a ground fault occurs and arc light is generated, the arc light is applied to the solar cell, and the solar cell generates power according to the intensity of the arc light. Since the output signal of this solar cell is taken out of the tank, by comparing the level of the output signal of the solar cell with the threshold value by the determination device, an accident such as a short circuit inside the tank or a ground fault occurs. It is possible to determine whether or not At this time, since the solar cell has a large light receiving area, it can effectively receive the arc light, and the difference in the arc light detection sensitivity depending on the accident position can be reduced, and the arc light detection sensitivity can be increased overall. .

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An accident detector for gas insulated electrical equipment according to an embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, the accident detector of this gas-insulated electric equipment has a light-receiving surface inside a handhole 3 of a tank 2 that contains, for example, a main circuit conductor 1 as an electric device and is filled with an insulating gas. The solar cell 4 is installed toward the center of the solar cell 4, and the solar cell 4 detects the arc light 5 caused by an accident such as a short circuit of the main circuit conductor 1 inside the tank 2 or a ground fault. Output signal line 4a of hand hole 3
The output signal of the solar cell 4 is led to the outside of the tank 2 by penetrating the lid 3a of the above and drawing to the outside of the tank 2. The output signal line 4a of the solar cell 4 is connected to the light emitting diode 6 provided outside the tank 2, and the light emitting diode 6 is driven to emit light by the output signal of the solar cell 4.
Then, one end of the optical fiber 7 is opposed to the light emitting diode 6, the other end of the optical fiber 7 is guided to the determination device 8, and the light of the light emitting diode 6 is transmitted to the determination device 8. The determination device 8 determines whether or not an accident has occurred inside the tank 2 based on the presence or absence of light incident from the optical fiber 7.

The judging device 8 is, specifically, an optical fiber 7.
An optical / electrical converter (O / E) 9 for converting the light of the light emitting diode 6 transmitted through the optical signal into an electric signal, an amplifier 10 for amplifying an output signal of the optical / electrical converter 9,
A determination unit 11 that determines whether or not the arc light 5 is generated in the tank 2 by comparing the output of 0 with a predetermined threshold value.
Composed of and.

According to this accident detector for gas-insulated electric equipment, when an arc light 5 is generated due to an accident such as a short circuit or a ground fault in the tank 2, the arc light 5 is irradiated to the solar cell 4 and the solar cell 4 will generate electric power according to the intensity of the arc light 5. Since the light emitting diode 6 is driven by the solar cell 4, the light output of the light emitting diode 6 is the arc light 5
It depends on the strength of. The light output of the light emitting diode 6 is transmitted to the determination device 8 through the optical fiber 7. In the determination device 8, the light transmitted through the optical fiber 7 is converted into an electric signal by the optical / electrical converter 9, further amplified by the amplifier 10, and then compared with a threshold value by the determination unit 11. When an accident occurs, light is transmitted through the optical fiber 7, the output signal level of the amplifier 10 exceeds the threshold value, and the determination unit 11 determines that the accident has occurred.

Since the accident detector of this gas-insulated electric equipment receives the arc light 5 by using the solar cell 4 having a large light receiving area, the arc light 5 can be effectively received and the arc light depending on the accident position. The detection sensitivity difference of the arc light 5 can be increased as a whole by reducing the difference in detection sensitivity of the arc light 5. Further, since the light emitting diode 6 is driven by the output of the solar cell 4 and the optical output of the light emitting diode 6 is transmitted to the determination device 8 by the optical fiber 7, the insulation between the tank 2 and the determination device 8 can be secured, High safety.

If there is no problem in terms of insulation, the output signal of the solar cell 4 may be sent to the determination device 8 to determine its signal level.

[0014]

According to the accident detector for gas-insulated electric equipment of claim 1, since the arc light is received by using the solar cell having a large light receiving area, the arc light can be effectively received. It is possible to reduce the difference in arc light detection sensitivity depending on the accident position and improve the arc light detection sensitivity as a whole.

According to the accident detector of the gas-insulated electric equipment of claim 2, since the light emitting diode is driven by the output of the solar cell and the optical output of the light emitting diode is transmitted to the judging device by the optical fiber, the tank. It is possible to secure the insulation between the judgment device and the judgment device, and the safety is high.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing the configuration of an accident detector for gas-insulated electrical equipment according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a configuration of an example of a conventional accident detector of gas-insulated electrical equipment.

[Explanation of symbols]

 1 Main Circuit Conductor (Electrical Equipment) 2 Tank 3 Hand Hole 4 Solar Cell 5 Arc Light 6 Light Emitting Diode 7 Optical Fiber 8 Judgment Device 9 Optical / Electrical Converter 10 Amplifier 11 Judgment Section

Claims (2)

[Claims] 1. A solar cell in which a light-receiving surface is installed inside a handhole of a tank containing an electric device and in which an insulating gas is sealed, with a light-receiving surface facing the center of the tank, and an output signal is led to the outside of the tank. Accident detector for gas-insulated electrical equipment. 2. The accident of gas-insulated electrical equipment according to claim 1, wherein a light emitting diode driven by the output signal of the solar cell is provided outside the tank, and one end of an optical fiber for optical transmission is arranged opposite to the light emitting diode. Detector.