JPH0619412B2 - Failure detection device for power equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a failure detection device for a power device, and more particularly to a detection device when insulation of a power device is broken.

«Prior art» As a maintenance means for power equipment such as transformers and GIS (gas insulated substations), in recent years, predictive maintenance technology has been developed and applied from outside to catch the operating status of equipment and signs of abnormality.
Such technologies include current, voltage, temperature, pressure, vibration,
Various sensors such as sound and gas are used.

By the way, generally, as the failure mode of the power equipment,
In many cases, the insulation performance deteriorates due to material deterioration over time, manufacturing and installation failures, etc., and eventually an accident such as a ground fault occurs after a partial discharge or intermittent arc occurs.

Considering such a failure mode, it is effective to directly detect the light due to partial discharge, predictive maintenance of power equipment, and identify the location of the accident to shorten the recovery time.
Since the means for detecting light is not affected by external noise or the like, it has been attracting attention. For example, this technology is disclosed at the National Conference of the Institute of Electrical Engineers of Japan in 1986.

FIG. 2 shows a GIS ground fault position detection device announced at the same competition.

The detection device shown in the figure comprises a sensor unit 2 attached to a GIS tank 1 and a signal detection unit 4 connected to the sensor unit 2 by an optical fiber 3.

The sensor unit 2 has a lens 6 that collects arc light A of a ground fault arc generated between the conductor 5 in the GIS tank 1 and the inner wall of the tank, and the optical fiber 3 is at the focal point of the lens 6.
The tip of is located.

The signal detection unit 4 includes a photoelectric converter 4a, an amplifier 4b, a comparator 4c, and a controller 4d,
When the arc light A is converted into an electric signal by the photoelectric converter 4a and the magnitude of the signal amplified by the amplifier 4b is equal to or larger than a predetermined value by the comparator 4c, the output signal is sent to the controller 4d. In response to the signal, the controller 4d locks, for example, the reclosed circuit of the circuit breaker.

However, the failure detection device for a power device having such a configuration has the technical problems described below.

<< Problems to be Solved by the Invention >> That is, in the failure detection device having the above configuration, since the arc light A of the ground fault arc is condensed by the lens 6, the arc light A needs to reach the lens 6 directly. However, there is a problem that it is difficult to install in a bent place and the attaching place is limited.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to have no limitation on a mounting location and to provide a failure detecting device for a power device having a wide degree of freedom in mounting. To provide.

<< Means for Solving the Problem >> In order to achieve the above object, the present invention detects a failure of a power device installed by interposing an electrically insulating medium made of a gas or a transparent liquid in a container shielded from the outside. In the device, a plurality of fiber unit groups are installed at different positions in the circumferential direction along the inner wall surface of the container, each of the fiber units constituting each group is made of fluorescent plastic fiber, and the fiber units in each group are arranged. Are arranged along the longitudinal direction of the container and adjacent to each other in the circumferential direction of the container so as not to overlap along the longitudinal direction of the container. It is connected to.

<< Operation and Effect of the Invention >> According to the failure detection device for a power device having the above-described configuration, since the fluorescent plastic fiber is installed in the container shielded from the outside, when arc light is incident on the fiber, this light is emitted from the fiber. It is absorbed by the fluorescent dye inside and then the fluorescence propagates into the fiber.

Therefore, if the light propagating in the fiber is detected at its end,
It can be confirmed that a ground fault arc has occurred in the container.

In this case, the fiber has a diameter of a few mm,
Since it has flexibility, it can be easily installed in a small gap or in a greatly bent place.

Further, a plurality of fiber unit groups are installed at different positions in the circumferential direction, each of the fiber units constituting each group is made of fluorescent plastic fiber, and the fiber units in each group are along the longitudinal direction of the container. Installed in the container and adjacent to each other in the circumferential direction of the container so as not to overlap along the longitudinal direction of the container, and each fiber unit was connected to the light intensity determination means. The accurate identification of

<< Examples >> Hereinafter, preferred examples of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a failure detection apparatus for electric power equipment according to the present invention.

The failure detection device shown in the figure is an application of the present invention to a power transmission line section of a GIS, in which the power transmission line 10 is covered with an insulator 12, and the outer periphery thereof has a cylindrical shape so as to be shielded from the outside. It is covered with a container 14.

An electrically insulating medium such as sulfur hexafluoride gas is enclosed in the container 14.

In this embodiment, a fluorescent plastic fiber is divided into a predetermined length to form a fiber unit 24, and n fiber units 24a to 24n are divided into three groups I, II, and III. , II, III are the first
As shown in FIG. (A), it is installed on the inner wall of the container 14 which is divided into three parts at substantially equal angles in the circumferential direction with respect to the power transmission line 10.

The fluorescent plastic fiber is an optical fiber containing a highly efficient organic fluorescent dye, and when light having a wavelength shorter than the fluorescent wavelength of the dye is incident on the optical fiber from its side surface, the incident light is a fluorescent dye. The fluorescence is emitted from the fluorescent dye into the optical fiber, and the emitted light propagates in the optical fiber toward the end portion.

As shown in FIG. 1 (B), each n fiber units 24a to 24n are installed along the longitudinal direction of the container 14 and are arranged so that those adjacent to each other in the circumferential direction do not overlap with each other. .

One end of each connector 26 is connected to one end of each fiber unit 24a to 24n, and a normal optical fiber 28 is connected to the other end of each connector 26.

A light intensity discriminator 30 is connected to the other end of the optical fiber 28, and the intensity discriminator 30 includes a photoelectric converter 32 and n.
It is composed of individual comparison paths 34a to 34n.

The comparison circuits 34a to 34n compare the intensities of the corresponding ones of the groups I to III.

It should be noted that the fiber has a diameter of about several mm and is flexible, so that a small gap or
It can be easily installed in a large bent area.

In the failure detection device configured as described above, the comparison circuit 34
By comparing the intensities of the fluorescence generated when each of the fiber units 24a to 24n receives light in a to 34n, it is possible to know at which position in the circumferential direction of the container 14 the ground fault arc has occurred, and the position in the longitudinal direction thereof. Since it is also known, it becomes possible to accurately identify the failure position.

In the above embodiment, the case where the present invention is applied to the power transmission line portion of GIS is illustrated, but the present invention is not limited to this, and for example, the transformer is installed in a sealed container. It can be applied to cases such as
The insulating medium of electric power equipment is applicable not only to gas but also to transparent liquid.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a failure detection device for electric power equipment according to the present invention, and FIG. 2 is an explanatory view showing a conventional failure detection device. 10 ... Transmission line (electric power equipment) 14 ... Container 24a to 24n ... Fiber unit 30 ... Strength discriminator

Claims (1)

[Claims] 1. A failure detection device for electric power equipment, wherein a plurality of fiber unit groups are provided along an inner wall surface of the container in an electric power equipment failure detection device installed with an electrically insulating medium made of a gas or a transparent liquid interposed in the container shielded from the outside. At different positions in the circumferential direction, each of the fiber units constituting each group is made of fluorescent plastic fiber, the fiber unit in each group is installed along the longitudinal direction of the container and the container Adjacent to each other in the circumferential direction of the container are arranged so as not to overlap along the longitudinal direction of the container, and each of the fiber units is connected to the light intensity discriminating means. .