Treatment measures after operation of transformer gas protection device

After the transformer gas protection device is operated, it should be carefully checked, carefully analyzed and correctly judged immediately, and treatment measures should be taken immediately.

When the gas protection signal is activated, the transformer should be checked immediately to find out the cause of the action, whether it is caused by accumulated air, lower oil level, secondary circuit failure or internal union of the upper transformer. If there is gas in the gas relay, the amount of gas should be recorded, observe the color of the gas and whether it is combustible in the test, and take gas samples and oil samples for chromatographic analysis, according to the relevant regulations and guidelines to determine the fault nature of the transformer. Chromatographic analysis refers to the collection of gas with chromatograph of hydrogen, oxygen, carbon monoxide, carbon dioxide, methane, ethane, ethylene, acetylene and other gases for qualitative and quantitative analysis, according to the name and content of the component accurately determine the nature of the federation, development trend, and severity.

If the gas in the gas relay is colorless, odorless and non-flammable, chromatographic analysis determines that it is air, the transformer can continue to operate and eliminate the intake defect in time. If the gas in the gas relay is flammable and the dissolved gas chromatographic analysis results in the oil are abnormal, the transformer should be comprehensively judged to determine whether the operation is stopped.

When gas relay action trip, the transformer shall not be put into operation before finding out the cause and eliminating the fault. In order to find out the cause, we should focus on the following factors and make a comprehensive judgment.

A. Whether breathing is obstructed or exhaust is not exhausted;

B. Protection and dc secondary circuits are normal;

C. Whether the appearance of the transformer is abnormal and obviously reflects the nature of the fault;

D. Whether the gas accumulated in the gas relay is flammable;

E. Chromatographic analysis results of gas in gas relay and dissolved gas in oil;

F. Necessary electrical test results;

G. Action of other relay protection devices of transformers.