Phenomenon: The arc generated by short-circuit current decomposes insulating materials such as transformer oil, thus generating a large number of combustible gases, which are collectively called gases. The more serious the fault is, the more gas is produced and the faster the flow rate is, and the gas flow is also mixed with thin and hot transformer oil. Gas protection is the protection that uses the hot gas flow and hot oil flow generated by thermal decomposition of transformer oil to act.

The process is as follows:

(1) Reset the sound, record the time of failure, check the change of the meter, check the trip of the circuit breaker, check, record and reset the light plate and protection action signal, and pay special attention to whether the differential protection or other protection is acting. If there is a circuit breaker control switch on the control panel, reset the switch handle of the tripping circuit breaker, make a preliminary judgment on the accident and report to the dispatcher. ?

(2) If there is a standby transformer, check whether the standby automatic switching device operates and whether the standby transformer is put into operation. If there is no operation, it should be put into operation manually, and the operation mode should be adjusted to ensure power supply to users. ?

(3) When there is no standby transformer, if the first two transformers run in parallel, neutral grounding switch and corresponding protection should be put into operation as required, and the monitoring of normal running transformers should be strengthened to prevent overload and transformer temperature from rising sharply. ?

Extended data:

Power transformer has always played an important role in power system, and one of the important devices to protect power transformer is gas protection. Gas protection is an important guarantee for the smooth operation of oil-immersed power transformer. Transformer tripping often occurs in high-grade and low-grade substations.

This phenomenon is mostly caused by transformer gas protection behavior, which will reduce the power supply stability of power system and bring great inconvenience to power users. Therefore, understanding the reasons of transformer gas protection and troubleshooting for these reasons can make the power system serve users safely and effectively.

Analysis, judgment and treatment measures of heavy gas protection action of China Knowledge Network-transformer