Methods of protecting oil-immersed transformers

When it comes to the word protection, it is natural that the S11 oil-immersed transformer is easily damaged, so protection is mentioned. Just like what we often say about protecting vulnerable groups, of course, it is not that the S11 oil-immersed transformer is weak. It still plays a vital role in long-distance power transmission and transformation, but in the powerful S11 oil-immersed Transformers also have fragile places, so effective protection is the root of preventing problems in S11 oil-immersed transformers.

It is mentioned that the abnormal working state of S11 oil-immersed transformer mainly includes overload, overcurrent caused by external short circuit, neutral point overvoltage caused by external grounding short circuit, oil level reduction caused by oil leakage in the oil tank or cooling system failure. Several common problems such as temperature rise. For the above S11 oil-immersed transformers, the protection methods of S11 oil-immersed transformers are introduced in turn:

The first and most important is the S11 oil-immersed transformer gas protection: to protect the S11 oil-immersed transformer internal short circuit and the failure of oil level reduction. S11 oil-immersed transformer gas protection reacts to various faults inside the oil tank of S11 oil-immersed transformer and the reduction of oil level. S11 oil-immersed transformers shall be equipped with gas protection. When the fault in the oil tank produces a slight gas or the oil level drops, the signal should be actuated instantaneously; when a large amount of gas is generated, the circuit breaker on each side of the transformer should be actuated.

The second is the differential protection and current quick-break protection of the S11 oil-immersed transformer: to protect the phase-to-phase short circuit of each phase of the transformer winding or the lead wire, the ground short circuit of the large ground current system, and the inter-turn short circuit of the winding. The other is the S11 oil-immersed transformer overcurrent protection: to protect the external phase-to-phase short circuit, and as a backup protection for gas protection and differential protection (or current quick-break protection).

The last is the zero-sequence current protection of the S11 oil-immersed transformer: to protect the external single-phase grounding short circuit of the large grounding current system. There is also S11 oil-immersed transformer overload protection: protection of symmetrical overload, only acting on the signal.

Through the protection methods of the above common problems, you should pay special attention to these problems, not only to protect the S11 oil-immersed transformer from damage, but also to ensure that the S11 oil-immersed transformer will not be damaged. A wide range of other security issues.