What is the function of the safety vent of a transformer?

The safety vent, commonly referred to as an explosion-proof tube in the power supply industry, is a traditional protective device that is rarely used in newly designed transformers. Its main function is to rapidly release a large amount of gas through the safety vent membrane (glass plate) when a fault occurs inside the transformer, thereby providing protection for the transformer.

The safety vent works in coordination with a regular oil storage tank, with the upper space connected to the oil storage tank through a common pipe. This ensures that both the oil storage tank and the safety vent space remain at atmospheric pressure, preventing the occurrence of pressure differentials between them and avoiding inadvertent activation of the safety vent.

For safety vents used in conjunction with diaphragm-sealed oil storage tanks, there is also a need for a connecting pipe to ensure that the upper part of the diaphragm is under the same atmospheric pressure as the safety vent space. Generally, it is not advisable to connect the safety vent directly to a moisture absorber independently, as this may compromise the sealing of the safety vent and result in the transformer oil still being exposed to the atmosphere.

LuShan, est. 1975, is a Chinese professional manufacturer specializing in power transformers and reactors for 49 years. Leading products are single-phase transformer, three-phase transformers, DC inductors, AC reactors, filtering reactor, expoxy resin high-voltage transformer and intermediate, high-frequency products. Our transformers and reactors are widely used in 10 application areas: rapid transit, construction machinery, renewable energy, intelligent manufacturing, medical equipment, coal mine explosion prevention , excitation system, vacuum sintering, central air conditioning.

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