JP2006017649A - Partial discharge detector for gas insulation electric power apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a partial discharge detector for a gas insulation electric power apparatus capable of coping with different diameters of flanges, and capable of carrying out easily attaching and detaching works for the flange. <P>SOLUTION: This partial discharge detector for the gas insulation electric power apparatus comprises a sensor for detecting an electromagnetic wave, a band-like flexible conductive sheet fixed with the sensor, a first locking tape bonded to make its surface side serve as a locking face with respect to one longitudinal end part of the conductive sheet, a second locking tape bonded to make its reverse face side serve as a locking face with respect to the other longitudinal end part of the conductive sheet, a first belt having a buckle in one end and bonded to the surface side with respect to the conductive sheet in a first locking tape side, and a second belt bonded to the surface side with respect to the conductive sheet in a second locking tape side. In the partial discharge detector, the first locking tape and the second locking tape are locked when the conductive sheet is wound around an inspected portion, and the second belt is fastened therein with the buckle. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a novel partial discharge detection device for gas-insulated power equipment, which detects, by electromagnetic waves, partial discharge in SF ₆ gas of gas-insulated power equipment in which power equipment such as circuit breakers, busbars, and transformers are housed in sealed containers. .

  In various types of power equipment installed in power plants and substations, a gas insulated power equipment container is generally a cylindrical metal tube, and a structure in which a conductor is supported by an insulator in this hollow portion. When a partial discharge occurs inside, the electromagnetic wave due to this discharge does not leak out from the metal container. However, since the part that supports the conductor in the metal container with an insulator or pulls out the secondary terminal of the transformer in the metal container is made of an insulator, electromagnetic waves are transmitted from this part to the outside. Leak out. This leakage electromagnetic wave is detected by a sensor, and the strength level and waveform characteristics are used to measure the degree of breakdown voltage degradation of the insulator and the breakdown voltage breakdown due to gas leakage, thereby preventing the failure of gas-insulated power equipment. It has been adopted.

  When a leaked electromagnetic wave is detected by a sensor, there is a problem that a measurement value fluctuates due to external noise or an error occurs in the measurement value. As means for solving this problem, for example, a method disclosed in Patent Document 1 has been proposed. In Patent Document 1, since a container of a gas-insulated power device is connected to a metal tube having a flange via an insulating spacer at a predetermined interval, a sensor is provided on a part of the outer periphery of the insulating spacer in the leakage electromagnetic wave detection method. And other parts are covered with a metal plate to prevent external noise from entering the sensor.

JP-A-8-136608

  However, in Patent Document 1, in order to prevent noise from entering, it is important to have a structure in which a plurality of metal plates can be attached in close contact with a metal tube of a gas insulating device without gaps. In addition to poor workability, cost increases are inevitable. Also, if the metal pipe and flange diameter are different or the structure and arrangement of the accessories around it are different, each type of metal plate must be prepared, and many differences in the structure must be prepared. In addition, it takes time and effort to make the selection, and the cost increases.

  An object of the present invention is to provide a partial discharge detection device for a gas-insulated power apparatus which can cope with a difference in outer diameter of a flange and can be easily attached to and detached from the flange.

  The present invention provides a sensor for detecting electromagnetic waves, a flexible strip-shaped conductive sheet to which the sensor is fixed, and a locking surface on the front side of one longitudinal end of the conductive sheet. And a second locking tape bonded to the back side of the other longitudinal end of the conductive sheet so as to be a locking surface. In the partial discharge detection device for a gas-insulated power device, the first locking tape and the second locking tape are locked when the sheet is wound around the site to be inspected.

  A first belt having a buckle at one end bonded to the front side with respect to the conductive sheet on the first locking tape side, and on the front side with respect to the conductive sheet on the second locking tape side It is preferable that the second belt is bonded and the buckle and the second belt can be fastened when the conductive sheet is wound around the site to be inspected.

  The conductive sheet is made of elastic rubber in which conductive metal powder is dispersed, and a window through which the electromagnetic wave passes is provided in a mounting portion of the sensor, and the sensor includes an antenna housed in a metal case. And a connector for connecting an electric signal of the electromagnetic wave detected by the antenna to the outside, and the metal case is preferably provided with a window through which the electromagnetic wave passes on the conductive sheet side.

  ADVANTAGE OF THE INVENTION According to this invention, the partial discharge detection apparatus of the gas insulated power apparatus which can respond to the difference in a flange outer diameter and can perform the attachment or detachment operation | work to a flange easily can be provided.

  FIG. 1 is a plan view showing a partial discharge detection device for a gas insulated power device according to the present invention. This apparatus has a conductive sheet 1, a sensor 2 for detecting electromagnetic waves, a first locking tape 3 a and a second locking tape 3 b, a first belt 4, and a second belt 6.

  One of the first locking tape 3a and the second locking tape 3b is one in which fine fibers are intertwined randomly in a hoop shape and formed into a plate shape, and the other is innumerable in a hook shape. It is a tape that is formed in a plate shape, and the two thin fibers are intertwined and bonded together by overlapping the two. The second locking tape 3b is against the vicinity of the other end of the conductive sheet 1 so that the first locking tape 3a is a locking surface on the front side of the conductive sheet 1 near the one end. Each of them is bonded to the conductive sheet 1 with an adhesive so as to be a locking surface on the back side.

  The first belt 4 has a buckle 5 at one end, the other end is at the upper end position (A) of the sensor 2 mounting position of the conductive sheet 1, and the second belt 6 has one end from the lower end of the sensor 2. It is connected to the distant position (B) by an adhesive. The first belt 4 and the second belt 6 are both made of polyamide resin, and two are provided in the drawing, but may be one or three as necessary.

  FIG. 2 is a plan view showing details of the attachment positions of the conductive sheet and the sensor. The conductive sheet 1 is a conductive sheet having flexibility by kneading and vulcanizing metal powder and fluid rubber. A indicates a position where one end of the first belt 4 is bonded, and B indicates a position where one end of the second belt 6 is bonded. The sensor 2 is provided at a desired position where the first belt 4 and the second belt 6 are not coupled.

  FIG. 3 is a cross-sectional view of the sensor and its vicinity. The outside of the sensor 2 is covered with a metal case 2b, and an antenna 2a for detecting electromagnetic waves is mounted inside. The detected signal is connected to the connector 2c through a metal wire, and is connected to the connector 2c by a cable. Connected to an external receiver. The detection surface of the antenna 2a is formed with a window 2d in which the metal case 2b is cut out, and matches the planar shape of the window 1a in which the conductive sheet 1 is similarly cut out. The metal case 2b is joined to the conductive sheet 1 with an adhesive. The antenna 2a is insulated and joined to the metal case 2b, has a metal rod formed in a U shape, and has a curved shape along the cylindrical outer shape of an insulating spacer 8 described later as shown in FIG. .

  FIG. 4 is a plan view showing the first belt. One end of the first belt 4 is passed through the window of the buckle 5 and fixed by folding back. The second belt 6 has a width to enter the buckle 5 as described above, is made of the same material as the first belt 4, and is preferably a resin.

FIG. 5 is a cross-sectional view showing an example of a portion where the partial discharge detector of the present invention is attached to a measurement site in a gas-insulated power device as a measurement target. The gas-insulated power device to be measured is sandwiched between the flange portions of the metal tubes 7a and 7b by a bolt (not shown) through an insulating space 8 such as acrylic resin, and the conductor 9 passes through the center portion. SF ₆ gas is sealed in the metal pipes 7a and 7b joined at the flange portion, and an arc generated when a contactor of a circuit breaker (not shown) is opened and closed is improved, and the breaking performance is improved. It plays the role of ensuring withstand voltage between the tubes 7a and 7b.

  At the time of energization, a high voltage of the conductor 9 is applied between the metal tubes 7a and 7b. However, when a foreign substance is mixed in the metal tube or a conductor connection failure occurs, a partial discharge occurs from that portion. Further, the same partial discharge is caused by the deterioration of the insulation resistance and the withstand voltage of the insulating space 8, and electromagnetic waves are generated at that time. This electromagnetic wave can be detected by the sensor 2, and the insulation performance of the device can be verified based on the presence / absence, strength level and waveform characteristics, thereby preventing an accident.

  FIG. 6 is a perspective view showing a state in which the partial discharge detection device of the present invention is attached to a measurement site of a gas insulated power device. The conductive sheet 1 is wound around the outer periphery of the insulating spacer 8 sandwiched between the flange portions of the metal tubes 7a and 7b, and temporarily fixed so that the first locking tape 3a and the second locking tape 3b are overlapped. Thereafter, as shown by the dotted line, the second belt 6 is passed through the window of the buckle 5 and pulled firmly to fix it. As a result, the sensor 2 is installed on the outer periphery of the insulating spacer 8, and the metal pipe 7 a and the flange outer diameter portion of the metal pipe 7 b are covered with the conductive sheet 1. Further, after the discharge detection operation is completed, the first belt 4 and the second belt 6 are removed from each other, and then the first locking tape 3a and the second locking tape 3b are removed from each other. It can be easily attached and detached.

  In this embodiment, the entire insulating spacer 8 can be almost completely covered with the conductive sheet 1 via the flange outer diameter portion. Therefore, when the leaked electromagnetic wave is detected by the sensor, the measured value fluctuates due to external noise. And there is no error in the measured value.

  In this embodiment, the lengths of the conductive sheet 1, the first belt 4, the second belt 6, the first locking tape 3a, and the second locking tape 3b are set appropriately. As a result, even if the outer diameter of the insulating spacer 8 changes slightly, if there is no extreme change, different parts can be measured, and the difference in the outer diameter of the flange can be achieved without manufacturing many new devices. Therefore, it is possible to cope with a small number of types.

  Furthermore, according to the present embodiment, the manufacturability is good and the attaching / detaching operation to the flange can be easily performed.

The top view of the partial discharge detection apparatus of this invention. The top view which shows the detail of the electroconductive sheet and sensor of the partial discharge detection apparatus of this invention. Sectional drawing which shows the detail of the electroconductive sheet and sensor of the partial discharge detection apparatus of this invention. The top view which shows the 1st belt which concerns on the partial discharge detection apparatus of this invention. The fragmentary sectional view which shows the attachment site | part of the partial discharge detection apparatus of this invention to the gas insulated power apparatus used as a measuring object. The perspective view which shows the state which mounts the partial discharge detection apparatus of this invention in gas insulated electric power equipment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Conductive sheet, 1a ... Window, 2 ... Sensor, 2a ... Antenna, 2b ... Metal case, 2c ... Connector, 2d ... Window, 2e ... Lead wire, 3a ... First locking tape, 3b ... Second engagement Stop tape, 4 ... first belt, 5 ... buckle, 6 ... second belt, 7a, 7b ... metal tube, 8 ... insulating spacer, 9 ... conductor.

Claims (4)

  A sensor for detecting electromagnetic waves, a flexible strip-shaped conductive sheet to which the sensor is fixed, and an adhesive surface on the front side with respect to one longitudinal end of the conductive sheet. A first locking tape; and a second locking tape bonded to the back side of the other longitudinal end of the conductive sheet so as to be a locking surface, the conductive sheet being inspected A partial discharge detecting device for a gas-insulated power device, wherein the first locking tape and the second locking tape are locked when wound around a part.   The first belt having a buckle at one end bonded to the front side with respect to the conductive sheet on the first locking tape side, and the conductive sheet on the second locking tape side according to claim 1. A gas-insulated power comprising: a second belt bonded to the front side; and the buckle and the second belt can be fastened when the conductive sheet is wound around a site to be inspected. Equipment for partial discharge detection of equipment.   3. The gas insulated power device according to claim 1, wherein the conductive sheet is made of an elastic rubber in which conductive metal powder is dispersed, and a window through which the electromagnetic wave passes is provided in a mounting portion of the sensor. Partial discharge detector. The sensor according to any one of claims 1 to 3, wherein the sensor includes an antenna housed in a metal case, and a connector for connecting an electric signal of the electromagnetic wave detected by the antenna to the outside. A partial discharge detection device for gas insulated power equipment, wherein a window through which the electromagnetic wave passes is provided on the conductive sheet side.

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