JPH04279872A - Abnormality detector of gas-charged electric equipment - Google Patents

Abstract

PURPOSE:To constantly and automatically measure the concentration of the decomposed product of a gas, without discharging the gas, so as to detect the abnormality of a gas-charged electric equipment. CONSTITUTION:A means 6 for measuring the ductility of the decomposed product of a gas is provided on the inside of a normal passage 4 communicated with a closed container 1 of a gas-charged electric equipment at two points, while valves 9a, 9b are left open. The decomposed product reaches the means 6 for measuring concentration due to diffusion and convection, and the measurement of the concentration is carried out automatically, and abnormal phenomena such as partial discharging and overheating generated in the equipment can thus be detected.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for detecting internal abnormalities such as partial discharge and overheating in switchgear and transformers using electrically insulating gas such as sulfur hexafluoride.

0002

[Prior Art] Abnormality detection methods for gas-filled electrical equipment include electrical detection methods using ground wire current sensors and antennas to detect partial discharge, acoustic methods using ultrasonic waves, and detection of minute luminescence. However, none of these methods have sufficient detection performance, and judgments are sometimes made by measuring the concentration of decomposition products of gases generated during abnormal situations. many. The method of measuring the concentration of decomposition products uses a detection tube that uses a chemical color reaction, and by releasing internal gas through this, quantitative measurements are performed from the range of color change. method is used.

0003

[Problems to be Solved by the Invention] Conventionally, in order to measure the concentration of decomposition products, a detection tube is always provided, and during inspection, the detection tube is attached to the equipment and the valve is opened to release the gas. is required, and there are significant restrictions due to maintenance effort and operator skill level. Additionally, in gas-filled electrical equipment, an adsorbent is usually stored in the container to remove decomposition products and mixed moisture, and the concentration of decomposition products generated due to internal abnormalities decreases over time, making it difficult to detect abnormalities. Sometimes it can be difficult. Furthermore, according to the conventional method, the gas inside is released every time a measurement is performed, so it is necessary to replenish the gas into the container after a certain number of measurements have been carried out. Therefore, the present invention makes it possible to constantly and automatically measure the concentration of gas decomposition products to detect abnormalities in gas-filled electrical equipment without releasing gas.

0004

[Means for Solving the Problems] In the present invention, a side passage for circulating gas is provided in a closed container of a gas-filled electrical device, and a means for measuring the concentration of decomposition products of the gas is provided in the side passage. Provide a valve that separates the gas from the gas inside the airtight container.

[0005]

[Operation] When an abnormal phenomenon such as partial discharge or overheating occurs in the electrical components inside the sealed container, the enclosed gas generates decomposition products due to a chemical reaction. Therefore, if the valve that separates the gas in the side passage and the closed container is kept open, the decomposition products will reach the means for measuring the concentration by diffusion or convection, and the concentration can be automatically measured. For example, if sulfur hexafluoride gas contains a small amount of water and overheats, sulfur tetrafluoride and sulfur dioxide are generated as decomposition products, so a detection tube is used as a means of measuring the concentration. , abnormalities can be detected by checking the range of discoloration through the viewing window.

[0006]

[Embodiments] Hereinafter, embodiments of the present invention will be explained with reference to the drawings. In FIG. 1, inside a sealed container 1 of a gas-filled electrical device, there are electrical components 2 such as a circuit opening/closing mechanism and transformer windings, as well as gas decomposition products and moisture that are adsorbed and removed. An adsorbent 10 that maintains purity is provided. The side channel 4 is a flow channel that communicates with the inside of the closed container 1 at two points, and a means 6 for measuring the concentration of decomposition products, such as a detection tube, is provided inside the side channel 4, and a peephole 8 is provided. Side road 4
This is for visually checking the internal condition of the device. Also valve 9a
, 9b are for separating the gas inside the side passage 4 and the closed container 1.

In the above configuration, when the electrical component 2 in the sulfur hexafluoride gas overheats due to poor contact, sulfur tetrafluoride and sulfur dioxide are generated due to a chemical reaction between the sulfur hexafluoride gas and the mixed moisture. Occur. These decomposed gases are
It moves into the side channel 4 by diffusion or convection and reaches the means 6 for measuring the concentration. Therefore the means 6 for measuring the concentration
By using a detection tube as a detector tube and checking the range of discoloration from outside the viewing window 8, the concentration can be measured and an abnormality can be detected. Furthermore, by closing the valves 9a and 9b, the cover 7 can be removed to facilitate inspection and replacement of the detection tube.

FIG. 2 shows another embodiment of the invention, in which the bypass 4
By using a blower 5 in the middle of the process, the diffusion and convection of the decomposition products can be carried out quickly, thereby shortening the time required for detection.

[0009]

[Effects of the Invention] As described above, in the present invention, since a means for detecting gas decomposition products is attached to the equipment, abnormality occurrence can be constantly monitored, and there is no need for operator operation. This also solves the problem of maintenance effort and operator skill level. Furthermore, by performing measurements inside the closed flow path, which were conventionally performed by releasing gas, replenishment of gas is no longer necessary.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of an abnormality detection device according to the present invention.

FIG. 2 is a diagram showing another embodiment.

FIG. 3 is a diagram showing a conventional detection method.

[Explanation of symbols]

1　Airtight container 2 Electrical components 3 Enclosed gas 4 Side road 5　Blower 6. Means for measuring the concentration of decomposition products 7. Cover 8 Peephole 9a, 9b valve 10 Adsorbent

Claims (1)

[Claims] Claim 1: In an electrical device in which electrical components are arranged in a closed container and a gas is sealed in the cavity, a side passage for circulating the gas is provided, and the concentration of decomposition products of the gas is determined in the side passage. An abnormality detection device for gas-filled electrical equipment that detects an abnormality inside the electrical equipment by providing a means for measuring the gas and a valve that separates the gas in the side passage and the airtight container.