JPH08136608A - Device for detecting partial discharge of gas-insulated power equipment - Google Patents

Abstract

PURPOSE: To provide a device for detecting partial discharge of gas-insulated power equipment which is not required to be installed always and is not affected by external noise. CONSTITUTION: The end section of an insulating spacer 3 for supporting a conductor 2 is covered with a detachable metallic shield case 4 on the outer periphery of the metallic tank 1 of gas-insulated power equipment. A battery- driven electromagnetic wave detector 5 which generates a warning sound or light when the detector 5 detects electromagnetic waves generated by partial discharge is provided in the case 4. The case 4 is bonded and electrically connected to the tank 1 at conductive parts 6. The detector 5 is shielded from external electromagnetic noise and is not affected by the noise, because the detector 5 is covered with the case 4 together with the tank 1. Since the case 4 is constituted in a detachable state, in addition, it is not required to always install the case 4 to the gas-insulated power equipment, but can be used only when partial discharge tests are required for field installation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for detecting a partial discharge in SF ₆ gas of electromagnetic waves of a gas-insulated power equipment in which power equipment such as a circuit breaker, a bus bar, and a transformer is housed in a sealed container by electromagnetic waves.

[0002]

2. Description of the Related Art A container (tank) of a gas-insulated power equipment is made of metal, and even if a partial discharge occurs inside, electromagnetic waves due to the partial discharge do not leak outside the container. However, since the part where the conductor is supported by the insulator or the secondary terminal of the current transformer contained in the container is pulled out of the container is made of the insulator, electromagnetic waves leak from this part. When it is attempted to detect the partial discharge in the container by detecting this electromagnetic wave, it is necessary to remove external noise.

[0003]

In order to detect the partial discharge of the gas-insulated electric power equipment while reducing the influence of external noise, it is necessary to put a sensor and a detector in the tank.
In this method, since the sensor is always put in the tank,
Although it is effective for newly installed equipment, it cannot be applied to already installed equipment.

The present invention has been made in view of the above points, and an object thereof is to provide a partial discharge detection device for a gas-insulated electric power device which does not need to be installed at all times and is not affected by external noise. It is in.

[0005]

The present invention comprises (1) an outer periphery of an insulating spacer joint portion provided in a metal tank of a gas-insulated electric power device, and an electromagnetic wave detector disposed at the inner periphery thereof, and Characterized in that it is covered with a detachable metallic shield case, and the shield case and the entire outer wall of the metal tank are electrically coupled by a predetermined means,
(2) The electromagnetic wave detector is driven by a battery and emits an alarm sound and an alarm light when an electromagnetic wave is detected. (3) The shield case and the entire outer wall of the metal tank are sealed with a soft shield. (4) The shield case is formed of a net-like electromagnetic shield, or a portion corresponding to the position where the electromagnetic wave detector is arranged is formed of the net-like electromagnetic shield. The other parts are formed of a metal container.

[0006]

When a partial discharge occurs in the metal tank of the gas-insulated power equipment, the electromagnetic waves generated by the partial discharge go out of the tank through the insulating spacer joint. Then, the electromagnetic wave is detected by an electromagnetic wave detector in the shield case, and an alarm sound,
A warning light is emitted. Since the insulating spacer joint is covered with the metal tank and the metallic shield case, electromagnetic noise from the outside is completely shielded. Therefore, the electromagnetic wave detector is not affected by external noise at all.

Since the electromagnetic wave detector is driven by a battery, it is not affected by electromagnetic noise from the power line. Since the shield case is detachably formed,
It does not need to be installed in the gas-insulated power equipment, and can be used only during the partial discharge test during on-site installation.

When measuring partial discharges at a plurality of test points at one time, it can be easily carried out by changing the alarm sound and alarm light of each electromagnetic wave detector.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 is a tank of a gas-insulated electric power device in which a conductor 2 is housed, and 3 is an insulating spacer for supporting the conductor 2. This insulating spacer 3
The end portion of is covered with a detachable metallic shield case 4 on the outer peripheral portion of the tank 1. Inside the metallic shield case 4, there is provided an electromagnetic wave detector 5 which is driven by a battery and emits an alarm sound and an alarm light when an electromagnetic wave generated by partial discharge is detected. Reference numeral 6 denotes a conductive portion for closely contacting and electrically connecting the shield case 4 and the tank 1, and the method of forming the conductive portion is as shown in FIG.

That is, the conductive portion 6 is formed on the entire outer wall of the tank 1 at both ends of the joint of the insulating spacer 3 by removing the insulating coating and applying a conductive tape or a conductive coating. The shield case 4 has, for example, FIG.
The electromagnetic shield net 4a shown in FIG. Further, the metal case 4b shown in FIG. 2C may be used instead of the electromagnetic shield net 4a. In this metal case 4b, the portion corresponding to the installation position of the electromagnetic wave detector 5 is constituted by the electromagnetic shield net 4aa, and the other portion is constituted by a case made of iron or the like, and the joint portion with the conductive portion 6 is adhered. In order to improve the above, the elastic shield member 7, for example, the "soft shield 2" shown in FIG.

In the apparatus constructed as described above, when a partial discharge is generated in the tank 1, electromagnetic waves generated by the partial discharge go out of the tank 1 through the insulating spacer 3 and the electromagnetic wave detector 5 in the shield case 4 is detected. Detected by. At this time, the occurrence of partial discharge is detected by the alarm sound and alarm light output through the electromagnetic shield net 4a or 4aa.

As described above, the electromagnetic wave detector 5 is the tank 1
Since it is completely surrounded by the shield case 4, electromagnetic noise from the outside is completely electromagnetically sealed and is not affected by the external noise at all. Further, since the electromagnetic wave detector 5 is driven by a battery, it is not affected by electromagnetic noise from the power line.

Since the shield case 4 is formed so as to be detachable, it is not necessary to always install it in the gas-insulated power equipment, and it can be used only during the partial discharge test at the time of on-site installation.

When measuring partial discharges at a plurality of test points at one time, it can be easily carried out by changing the alarm sound and alarm light of each electromagnetic wave detector 5.

[0015]

As described above, according to the present invention, the outer periphery of the insulating spacer joint portion provided in the metal tank of the gas-insulated electric power equipment is provided with the electromagnetic wave detector at the inner peripheral portion, and the attachment / detachment is possible. Since it is covered with a metallic shield case that is formed as possible and the shield case and the entire outer wall of the metal tank are electrically coupled by a predetermined means, the following excellent effects are obtained.

(1) There is no malfunction due to electromagnetic noise from the outside, and the detection sensitivity is significantly improved.

(2) Since the electromagnetic wave detector is battery driven, it is not affected by electromagnetic noise from the power line.

(3) Since the shield case is detachably formed, it is not necessary to always install it in the gas-insulated power equipment, and it can be used only during the partial discharge test at the time of on-site installation. Therefore, it can be easily applied not only to newly installed gas-insulated power equipment but also to existing equipment.

(4) When measuring partial discharges at a plurality of test points at one time, it can be easily carried out by changing the alarm sound and alarm light of each electromagnetic wave detector.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a main part of an embodiment of the present invention.

FIG. 3 is a structural diagram showing a main part of an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tank 2 ... Conductor 3 ... Insulating spacer 4 ... Shield case 4a, 4aa ... Electromagnetic shield net 4b ... Metal case 5 ... Electromagnetic wave detector 6 ... Conductive part 7 ... Soft shield

Claims (5)

[Claims] 1. A metallic shield case detachably formed by arranging an electromagnetic wave detector on an outer peripheral portion of an insulating spacer joint portion provided on a metal tank of a gas-insulated electric power equipment and an inner peripheral portion thereof. A partial discharge detection device for a gas-insulated power device, characterized in that the shield case and the entire outer wall of the metal tank are electrically coupled by a predetermined means. 2. The partial discharge detection device for a gas-insulated power device according to claim 1, wherein the electromagnetic wave detector is driven by a battery and emits an alarm sound and an alarm light when an electromagnetic wave is detected. 3. The partial discharge detection of the gas insulated power equipment according to claim 1, wherein the shield case and the outer circumference of the outer wall of the metal tank are sealed by a soft shield and electrically coupled. apparatus. 4. The partial discharge detection device for a gas-insulated power device according to claim 1, wherein the shield case is composed of a net-like electromagnetic shield. 5. The shield case is characterized in that a portion corresponding to a position where the electromagnetic wave detector is arranged is formed of a net-like electromagnetic shield, and the other portion is formed of a metal container. Or the partial discharge detection device of the gas-insulated power equipment according to item 3.