JPH02181668A - Abnormality detecting device for gas insulation electric equipment - Google Patents

Abstract

PURPOSE:To improve the detection accuracy by providing an optical fiber which contains a fluorescent agent, leading its end parts out of a container, coupling it with a photodetector, and detecting abnormality over a wide range. CONSTITUTION:The optical fiber 21 which contains the fluorescent agent is set making one round along the inner peripheral surface of the container 12 of a gas insulation bus 14. Both end parts of the fiber 21 are led out of the container 12 and connected to the photodetector 22. Then if abnormality such as a flash fault or partial discharge occurs between a conductor 11 and the container 12, the optical fiber 21 is irradiated with its light and the fluorescent agent in the core emits light. The light is propagated in the optical fiber 21 to the end parts and converted by the photodetector 22 into an electric signal, which is sent to a signal processing part 17 to detect the abnormality occurrence. The photodetector 22 is fitted outside the container 12, so the sensor can be fitted equally and the sufficient detection accuracy is obtained over a wide range.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for detecting abnormalities such as flash faults and partial discharges occurring in gas-insulated electrical equipment.

[Prior art]

Gas-insulated electrical equipment such as gas-insulated busbars, pipeline aerial power transmission lines, and gas-insulated switchgear has a high-voltage conductor placed inside an iron or aluminum container (sheath), and the internal space of the container is filled with SFa gas, etc. It is filled with insulating gas under pressure.

In such gas-insulated electrical equipment, in order to detect the occurrence of an accident, detect the point of an accident, and predict the occurrence of an accident, if an abnormality such as a flash fault or partial discharge occurs between the conductor and the container or along the insulating spacer, , we need to detect it. However, in the case of gas-insulated electrical equipment, it is not possible to visually inspect the inside from the outside, so conventionally a partial discharge sensor is installed in a part of the container.
Various sensors such as ultrasonic sensors and vibration sensors are installed to detect abnormalities.

An example of this is shown in Figure 3, where 11 is a conductor, 12 is a container (sheath) filled with insulating gas under pressure, and 13 is a conductor 11.
These are insulating spacers that support the gas insulated bus bar 14.
It consists of In this example, partial discharge sensors 15 are attached to the container 12 at appropriate intervals to detect abnormalities. Note that 16 is a signal conversion section, and 17 is a signal processing section.

Figure 4 shows another example. In this example, a vibration sensor 18 is attached to a part of the container 12 to detect vibrations caused by internal discharge or the like to detect an abnormality.

〔assignment〕

With conventional abnormality detection devices, it is possible to detect an abnormality at the location where the sensor is attached, but it is difficult to uniformly monitor the entire cross section because the conductor may become an obstacle. If the entire cross section is to be monitored evenly, it will be necessary to devise measures such as installing sensors on the top, bottom, left and right, which will increase costs. In addition, with the type where the sensor is installed inside the container, it is necessary to take measures not to disturb the electric field inside the gas-insulated electrical equipment, making installation of the sensor cumbersome.On the other hand, with the type where the sensor is installed outside the container, sufficient detection accuracy is required. There are also problems such as not being able to obtain.

[Means for solving problems and their effects]

The present invention provides an abnormality detection device for gas-insulated electrical equipment that solves the above-mentioned problems. Alternatively, the end of the optical fiber connected thereto is guided out of the container, and a photodetector is provided at the end of the guided optical fiber.

An optical fiber containing a fluorescent agent contains a fluorescent agent in the core or an intermediate layer between the core and the cladding. When light hits it from the outside, the fluorescent agent emits light, and the light is transmitted through the core. , which can be detected at the end of the optical fiber (Japanese Patent Laid-Open Nos. 59-69701 and 63-566).
10, etc.).

If such an optical fiber containing a fluorescent agent is installed inside a container of gas-insulated electrical equipment, if a flash fault or partial discharge occurs within the container, the light will be irradiated onto the optical fiber containing a fluorescent agent. This causes the fluorescent agent to emit light, which is transmitted through the optical fiber.

Therefore, by leading the end of the optical fiber outside the container, it becomes possible to detect flash faults and partial discharges occurring inside the container outside the container.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment in which the present invention is applied to abnormality detection of a gas insulated bus bar.
A fluorescent agent-containing optical fiber 21 is installed so as to go around the inner peripheral surface of the container 12 .

Both ends of this fluorescent agent-containing optical fiber 21 are led out of the container 12 and connected to a photodetector 22. The part where the fluorescent agent-containing optical fiber 21 is led out of the container 12 is kept airtight.

The fluorescent agent-containing optical fiber 21 may be one in which a core made of polystyrene or the like to which a fluorescent agent is added is coated with a cladding made of polyvinyl acetate or the like. Further, the fluorescent agent-containing optical fiber 21 can be fixed to the inner surface of the container 12 using an adhesive or the like.

If the fluorescent agent-containing optical fiber 21 is installed as described above, if an abnormality such as a flash fault or partial discharge occurs between the conductor 11 and the container 12, the light will be irradiated to the fluorescent agent-containing optical fiber 21, Since the fluorescent agent in the core emits light, the light is transmitted through the optical fiber 21 to the end. optical fiber 2
At the end of 1, a photodetector 22 converts an optical signal into an electrical signal, and this electrical signal is sent to a signal processing section 17 to detect the occurrence of an abnormality.

The fluorescent agent-containing optical fiber 21 has a large light transmission loss in the longitudinal direction, so it cannot transmit light over a long distance. Therefore, in the above embodiment, the photodetector 22 is installed just outside the container 12. The detected optical signal is converted into an electrical signal and transmitted to the signal processing unit 17 in a monitoring room or the like. However, a normal optical fiber is connected to the end of the fluorescent agent-containing optical fiber 21, and the optical fiber is Optical transmission to the signal processing section 17 may also be performed in the signal processing section 17, in which case the photodetector would be provided in the signal processing section. Further, although the fluorescent agent-containing optical fiber 21 is usually made of plastic, it can also be made of glass.

Figure 2 shows another embodiment of the present invention, a gas insulated bus bar 14.
In this case, there is a relatively high possibility that an abnormality such as a flashover will occur at the installation location of the insulating spacer 13 that supports the conductor 11. Therefore, in this embodiment, on both sides of the insulating spacer 13,
A fluorescent agent-containing optical fiber 21 is installed so as to go around the inner peripheral surface of the container 12. The other configurations are the same as those of the previous embodiment.

In this way, fluorescent agent-containing optical fibers can be used in spacers, connections, sliding parts, angle bending parts, blocking parts, etc. of gas-insulated electrical equipment.
It is desirable to install it in a place where there is a high possibility of abnormality occurring. Furthermore, the method of installing the fluorescent agent-containing optical fiber is not limited to the circumferential direction, but may be installed in the longitudinal direction or the spiral direction.

〔Effect of the invention〕

As described above, according to the present invention, abnormalities such as flash faults and partial discharges occurring in gas-insulated electrical equipment can be detected over a wide range, and there is an advantage that detection accuracy is improved. Also, optical fiber containing fluorescent agent is &1! Since it is an L-shaped body and thin, there is no risk of disturbing the electric field inside the gas-insulated electrical equipment, and stable abnormality detection can be performed.

[Brief explanation of the drawing]

Figure 1 (IS+(bl) is a vertical cross-sectional view and a cross-sectional view of a gas-insulated electric equipment abnormality detection device according to an embodiment of the present invention, and Figure-2 is a vertical cross-sectional view and a cross-sectional view showing another embodiment of the present invention. 3 and 4 are longitudinal cross-sectional views of conventional gas insulated electric equipment abnormality detection devices, respectively. ll: conductor, 12: container (sheath), 13: insulating spacer, 14: gas insulated bus bar, 21: fluorescent agent Input optical fiber, 22: Photodetector. Figure- (a) Figure-3 Figure-2 Figure-4

Claims (1)

[Claims] 1. Install an optical fiber containing a fluorescent agent inside the container of gas-insulated electrical equipment, lead out the optical fiber or the end of the optical fiber connected to it outside the container, and detect light at the end of the led out optical fiber. An abnormality detection device for gas insulated electrical equipment, characterized in that it is equipped with a device.