What are the Differences Between Main Transformer Differential and Gas Protection?

1.The main transformer differential protection is designed and manufactured according to the principle of circulating current, and the gas protection is designed and manufactured according to the characteristics of gas generated or decomposed when the transformer internal failure.

2. Differential protection is the main protection of the transformer, and gas protection is the main protection of the internal fault of the transformer.

3.According to different protection scope:

A Differential protection:

1) The main transformer lead line and transformer coil have multiphase short circuit.

2) Serious single-phase inter-turn short circuit.

3) Grounding fault of protection coil and lead wire in high current grounding system.

B Gas protection:

1) Transformer internal multiphase short circuit.

2) Inter-turn short circuit, inter-turn and core or outside and short circuit.

3) Iron core failure (heating and burning loss).

4) Oil under the surface or oil leakage.

5) Poor contact of tap switch or poor welding of wire.