What are the ways of protecting the transformer?
Transformer protection is commonly used to protect the internal fault of the main protection of gas and differential. Backup protection is quick and overcurrent. There are semi-insulating structure of the neutral point over-voltage protection (arrester), oil temperature alarm.
First, the gas protection: to protect the transformer internal short circuit and oil surface failure.
Second, differential protection, current quick-break protection: to protect the transformer winding or lead-out phase of the phase-to-phase short circuit, large ground current system grounding short circuit and winding turn short circuit.
Third, over-current protection: to protect the external phase short circuit, and as a gas protection and differential protection (or current quick-break protection) backup protection.
Four, zero sequence current protection: protection of large ground current system external single-phase ground short circuit.
5, overload protection: to protect the symmetrical overload, only acting on the signal.
Six, over-excitation protection: to protect the transformer over-excitation does not exceed the allowable limit.
Large transformer main protection is differential and gas, backup protection including temperature, quick overcurrent and so on!
