JPH0456109A - Internal failure detecting device for gas insulating electric apparatus - Google Patents

Abstract

PURPOSE:To make it possible to securely and early find a failure in a gas insulating electric apparatus without manual work by permitting a sensor housing chamber for an electrolyte sensor effective for detecting a decomposed gas index in the apparatus through an external piping to communicate with the inside of a tank of the apparatus. CONSTITUTION:When a failure such as discharge, overheating, or the like occurs in a tank 2 for transformer, decomposed gas flows and expands in a sensor housing chamber 5 via an external piping 3 and a valve 4a and touches the electrolyte part of an electrolytic sensors 6a and 6b. Then, hydrolytic gas is ionized in the electrolyte part of sensors 6a and 6b to generate electrolytic current. This current is sent out to a recorder 11 through sensor output signal lines 10a and 10b. With this, omission of the detection caused by change in density by time lapse can be eliminated. Further, since the presence or absence of the occurrence of an internal failure is automatically recorded, the internal failure of the apparatus can be securely grasped without taking much manual work.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an internal abnormality detection device for gas-insulated electric equipment filled with an insulating gas such as SF or gas.

[Conventional technology]

For example, detection of internal abnormalities in SF, gas-insulated electric equipment,
This is done by analyzing hydrolyzable decomposition gases from substances that are generated due to abnormalities such as electrical discharge or overheating. The general method for this analysis is to collect the decomposed gas, take it back to an analysis center, and perform it using an analysis device such as a gas chromatograph or a mass spectrometer.

[Problem to be solved by the invention]

This conventional method not only requires specialized knowledge and techniques for analysis, but also requires a lot of manpower and time from gas sampling to obtaining results. Also S
F. Some decomposition indicator components useful for detecting abnormalities in gas-insulated electrical equipment may undergo hydrolysis or adsorption after gas collection, resulting in changes in concentration, so if it takes too long, it may be difficult to obtain accurate analysis results. There may be cases where this is not possible.

This invention was made to solve the above problem.
It is an object of the present invention to provide an internal abnormality detection device for gas-insulated electrical equipment that can detect internal abnormalities in gas-insulated electrical equipment at an early stage without requiring human intervention.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a sensor storage chamber into which an insulating gas sealed in an equipment tank is introduced through external piping; Is the output of the sensor input? +, the configuration includes a recorder.

[Function] In the present invention, the decomposed gas generated due to an internal abnormality in the equipment tank is immediately introduced into the sensor storage chamber and comes into contact with the electrolyte sensor. The decomposed gas that has come into contact with the sensor turns into ions in the electrolyte part of the sensor and generates an electrolytic current, so it is possible to detect an internal abnormality by reading the presence or absence of the current or its level from the recording paper.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In the if diagram, 1 is the SF and gas enclosed in the transformer tank 2, 3 is an external pipe for leading the gas from the transformer tank 2 to the sensor storage chamber 5, and 4a is this external pipe 3.
6a to 6b are electrolyte sensors housed in the sensor housing chamber 5; 7 is a flange lid of the sensor housing chamber 5, which has sensor output line signal terminals 9a and 9b; The opening of the sensor storage chamber 5 is hermetically closed through the opening. 10a and fob are sensor output signal lines of electrolyte sensors 6a and 6b, respectively; 11 is a recorder; 12
is a gas exhaust pipe of the sensor storage chamber 5, and is provided with a valve 4b.

In this configuration, if an abnormality such as discharge or overheating occurs in the transformer tank 2, the decomposed gas will be transferred to the external pipe 3,
It flows into the sensor storage chamber 5 via the valve 4a, diffuses, and comes into contact with the electrolyte parts of the electrolyte sensors 6a, 6b. At this time, the hydrolyzable gas is ionized in the electrolyte parts of the sensors 6a and 6b to generate an electrolytic current. This current is sent to the recorder 11 through sensor output signal lines 10a and 10b.

By the way, when abnormalities such as the above-mentioned discharge and overheating occur, SF,
The gas decomposes to produce SF. This SF is thought to be decomposed by surrounding moisture as follows.

SF4 +H2O-8oF2+2HF...(1)
SOF2 +H20-3o2 ・ ・ ・ ・ ・ ・
・ ・ ・(2) Figure 3 shows a commercially available electrolyte sensor,
A decomposed gas of S F b gas was flowed and its output was recorded. It was performed using three types of sample gases with different decomposition concentrations obtained by generating electric discharge in S F b gas where organic materials coexist. . For each sample gas, the concentrations of CF4 and F-, which are decomposition indicator components, in SF6 gas were analyzed by gas chromatography and ion chromatography, and then flowed through an electrolyte sensor at about 500 mj 27 min, and the sensor output was examined. From this figure, it can be seen that CF4, F which is a decomposition gas index
- It is understood that there is a correlation between the concentration of SF b in the gas and the output of the electrolyte sensor, and the electrolyte sensor has SF,
It is understood that by bringing the gas into contact, SF and decomposition indicator components in the gas can be detected, and internal abnormalities can be detected.

As described above, in this embodiment, the decomposition gas generated due to an internal abnormality in the transformer tank 2 is immediately introduced into the sensor storage chamber 5 and comes into contact with the electrolyte sensors 6a and 6b, so that the decomposed gas is not affected by the passage of time. It is possible to eliminate detection failures due to concentration changes.

Furthermore, since the presence or absence of an internal abnormality is automatically recorded, the internal abnormality can be reliably known without much human intervention.

In this embodiment, the natural diffusion of the gas in the sensor storage chamber 5 is used to bring the decomposed components in the SF and gas into contact with the electrolyte sensor, but as shown in FIG. If a gas circulation path of transformer tank 2 - external piping 3 - sensor storage chamber 5 - external piping 3A - transformer tank 2 is formed by providing Internal abnormalities can be detected. Note 1
3 is a circulation pump.

Although SF and gas insulated electrical equipment have been described in the above embodiments, the present invention can be applied to other gas insulated electrical equipment to obtain similar effects.

〔Effect of the invention〕

As explained above, the present invention has a structure in which a sensor housing containing an electrolyte sensor effective for detecting decomposition gas indicators can be communicated with the inside of the equipment tank through external piping, and the sensor output can be recorded. Since it is possible to know whether an internal abnormality has occurred by simply checking the internal abnormality,
It can be detected early and reliably without the need for human intervention.

[Brief explanation of the drawing]

FIGS. 1 and 2 are schematic configuration diagrams showing embodiments of the present invention, and FIG. 3 is a characteristic diagram showing the relationship between the decomposed concentration of S F h decomposed gas and the electrolyte sensor output. In the figure, 2 - transformer tank, 3.3A - external piping,
4a-4cm valve, 5-sensor storage chamber, 6a, 6b
-・Electrolyte sensor, 11-recorder. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] A sensor storage chamber into which an insulating gas sealed in an equipment tank is introduced through external piping, one or different types of electrolyte sensors stored in this sensor storage chamber, and a recorder into which the output of this electrolyte sensor is input. An internal abnormality detection device for gas-insulated electrical equipment characterized by: