What is the gas protection defect of the transformer?

Gas protection is the main protection of the transformer. Light gas acts on the signal, and heavy gas acts on the trip. The following analyzes the causes and treatment methods of gas protection actions:

① The cause of the gas protection action may be that the oil filtering, refueling and cooling systems are not tight, which causes air to enter the transformer;

② The oil level drops slowly due to temperature drop and oil leakage; or a small amount of gas is generated due to transformer defects;

③ Caused by the occurrence of through short circuit defects;

④ Caused by defects in the secondary circuit of the protection equipment.

The signal is announced after the light gas protection action. The reasons are: there are minor defects inside the transformer; air inside the transformer; defects in the secondary circuit, etc. The manufacturer of high and low voltage switchgear recommends that the staff should check immediately, if no abnormality is found, gas sampling and analysis should be carried out. When the gas protection action trips, serious defects may occur inside the transformer, causing the oil to decompose a lot of gas, or the secondary circuit may be defective. If the gas protection action trips, the backup transformer should be put in first, and then external inspection should be carried out. Check the oil pillow explosion-proof door, whether each welding seam is cracked, and whether the transformer shell is deformed; after all, check the flammability of the gas.