Method for measuring the electrification tendency of SF6 gas

By measuring the principle of SF6 gas binding with water molecules and utilizing the time it takes for frost to dissipate on the dew point meter mirror, the false alarm and time-consuming problems of partial discharge detection in electrical equipment are solved, thus achieving rapid and economical SF6 gas charging tendency determination and discharge fault diagnosis.

CN119619752BActive Publication Date: 2025-10-24POWER RES INST OF STATE GRID SHAANXI ELECTRIC POWER CO LTD +1
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Patent Information

Application Number
CN202411741739.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-11-29
Publication Date
2025-10-24
Estimated Expiration
2044-11-29

AI Technical Summary

Technical Problem

When detecting partial discharge in electrical equipment, existing technologies such as the pulse current method and electromagnetic wave method are susceptible to environmental interference and have a high probability of false alarms. The optical method has poor sensitivity, the characteristic gas detection method cannot reflect the intensity of partial discharge inside the equipment, and humidity measurement is time-consuming.

Method used

By measuring the time it takes for the frost layer on the dew point meter's mirror to disappear when a mixture of SF6 gas and a specific humidity is present, and utilizing the principle of SF6 combining with water molecules to determine the gas's charging tendency, routine maintenance testing using a conventional dew point meter can shorten measurement time.

Benefits of technology

It enables rapid judgment of the charging tendency of SF6 gas during daily operation and maintenance, reduces the complexity and cost of detection, provides diagnostic support for the degree of partial discharge, and avoids the addition of additional instruments.

✦ Generated by Eureka AI based on patent content.
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Abstract

The application discloses a kind of SF6 gas electric tendency determination method, comprising the following steps: measuring the humidity D1 of SF6 gas in gas chamber. Frost layer is established using SF6 gas without electricity and humidity D2. The first mixed gas obtained by mixing SF6 gas in gas chamber with SF6 gas without electricity and humidity D2 according to a set ratio is passed to the frost layer, and the time T required for the first mixed gas to change the thickness of the frost layer is measured. The second mixed gas obtained by mixing SF6 gas without electricity and humidity D1 with SF6 gas without electricity and humidity D2 according to a set ratio is passed to the frost layer, and the time T1 required for the second mixed gas to change the thickness of the frost layer is measured. Whether the SF6 gas in the gas chamber has an electric tendency is determined according to T and T1. The application uses the principle of combining SF6 ‑ with H2O after partial discharge, using SF6 gas with a certain humidity as reference gas, by measuring the elimination time of the reference gas cold mirror frost layer to a certain thickness, the electric tendency of the SF6 gas in the gas chamber can be determined.
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