JP2623155B2 - Internal abnormality detection device for gas insulated electrical equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a device for detecting an internal abnormality of a gas-insulated electric device filled with SF ₆ gas.

[Conventional technology]

Detection of an internal abnormality of the SF ₆ gas insulated electric device is performed by analyzing a hydrolytic decomposition gas from a substance generated by an abnormality such as discharge or overheating. A general method of this analysis is to collect the above-mentioned cracked gas, take it back to the analysis center, and use an analyzer such as a gas chromatograph or a mass analyzer.

[Problems to be solved by the invention]

In this conventional method, not only analysis requires specialized knowledge and skills, but also a problem that a lot of manpower and time are required from gas sampling to obtaining a result. Also
Some of the decomposition index components that are useful for detecting abnormalities in SF ₆ gas-insulated electrical equipment undergo hydrolysis or adsorption after gas sampling and change their concentration.If it takes too long, accurate analysis results can be obtained. May not be possible.

The present invention has been made in order to solve the above-described problem, and provides an internal abnormality detection device for a gas-insulated electric device that can detect an internal abnormality of the gas-insulated electric device at an early stage without requiring any human intervention. With the goal.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a sensor storage chamber into which SF ₆ gas sealed in an equipment tank is introduced through an external pipe, and quantitatively measures a decomposition degree of the SF ₆ gas stored in the sensor storage chamber. One or a plurality of different kinds of possible electrolyte sensors and a recorder to which the output of the electrolyte sensor is input are provided.

[Action]

According to 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 after the generation. The decomposed gas that has come into contact with the sensor becomes ions in the electrolyte portion of the sensor and generates an electrolytic current. Therefore, the presence or absence or level of the current can be read from the recording paper to detect an internal abnormality and its degree.

〔Example〕

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

In FIG. 1, 1 is enclosed in a transformer tank 2
SF ₆ gas, 3 is an external pipe for taking out gas from the transformer tank 2 to the sensor storage chamber 5, 4a is a valve provided in the external pipe 3, and 6a to 6b are stored in the sensor storage chamber 5. The electrolyte sensor 7 is a flange lid of the sensor storage chamber 5, has sensor output signal terminals 9 a and 9 b, and hermetically closes the opening of the sensor storage chamber 5 via the packing 8. 10a and 10b are sensor output signal lines of the electrolyte sensors 6a and 6b, respectively, 11 is a recorder, 12 is a gas discharge pipe of the sensor storage chamber 5, and is provided with a valve 4b.

In this configuration, when an abnormality such as electric discharge or overheating occurs in the transformer tank 2, the above-described decomposition gas flows into the sensor storage chamber 5 via the external pipe 3 and the valve 4a and diffuses, and the electrolyte gas 6a , 6b. At this time, the hydrolyzable gas is ionized in the electrolyte portions of the sensors 6a and 6b to generate an electrolytic current. This current is sent to the recorder 11 through the sensor output signal lines 10a and 10b.

By the way, when abnormalities such as the discharge and overheating occur, SF ₆
Results in a SF ₄ gas is decomposed. This SF ₄ is considered to be decomposed by ambient moisture as follows.

SF ₄ + H ₂ O → SOF ₂ + 2HF… (1) SOF ₂ + H ₂ O → SO ₂ + 2HF… (2) Fig. 3 shows the flow of SF ₆ gas decomposition gas into a commercially available electrolyte sensor and its output. This was performed using three types of sample gases having different decomposition concentrations obtained by generating discharge in SF ₆ gas in which an organic material coexists. Each sample gas, CF _4, F is an exploded indicator component ^- the concentration of SF ₆ gas from analyzed by gas chromatography and ion chromatography, flowed at about 500 ml / min to the electrolyte sensor, examine the sensor output Was. From this figure, the decomposition gas indices CF4 and F
^- be seen that a correlation between the concentration of SF ₆ gas of the output of the electrolyte sensor by contacting the SF ₆ gas to the electrolyte sensor, to detect the degradation index component of SF ₆ gas It is understood that it is possible to know the internal abnormality and its degree.

As described above, in the present embodiment, the decomposition gas generated due to the 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. Omission of detection due to a change in density can be eliminated.

Further, since the presence or absence of the occurrence of the internal abnormality is automatically recorded, the internal abnormality and the degree of the internal abnormality can be surely known without much human assistance.

In this embodiment, the contact between the decomposition component in the SF ₆ gas and the electrolyte sensor utilizes the natural diffusion of the gas in the sensor storage chamber 5, but as shown in FIG. 2, the external pipe 3A having the valve 4c is used. The transformer tank 2-external piping 3-
By forming a gas circulation path between the sensor storage chamber 5, the external pipe 3A and the transformer tank 2, it is possible to detect the internal abnormality and its degree more quickly than in the embodiment of FIG. In addition, 13 is a circulation pump.

In the above embodiment, the SF ₆ gas insulated electric device has been described, but the same effect can be obtained by applying the present invention to other gas insulated electric devices.

〔The invention's effect〕

As described above, the present invention has a configuration in which the sensor storage quality containing the electrolyte sensor effective for detecting the decomposition gas index can be communicated with the inside of the equipment tank through the external pipe and the sensor output is recorded, so that the recording paper is formed. Since the presence or absence of the occurrence of the internal abnormality and the degree thereof can be known only by looking at the internal abnormality, the internal abnormality and the degree thereof can be reliably detected at an early stage without any assistance from humans.

[Brief description of the drawings]

FIGS. 1 and 2 are schematic structural diagrams showing an embodiment of the present invention, respectively, and FIG. 3 is a characteristic diagram showing the relationship between the decomposition concentration of SF ₆ decomposition gas and the output of an electrolyte sensor. In the figure, 2 ... Transformer tank, 3, 3A ... External piping, 4a-4c ... Valve, 5 ... Sensor storage room, 6a, 6b ...
... electrolyte sensor, 11 ... recorder. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

(57) [Claims] 1. A sensor storage chamber into which an SF ₆ gas sealed in an equipment tank is introduced through an external pipe, and one or a kind stored in the sensor storage chamber and capable of quantitatively measuring the degree of decomposition of the SF ₆ gas. An internal abnormality detection device for a gas-insulated electric device, comprising: an electrolyte sensor having a different type; and a recorder to which an output of the electrolyte sensor is input.