6 ~ 10KV the workshop substation main transformer high voltage side is usually instal led with a time limit for over-current protection; such as over-current protection action time 0.5 ~ 0.7s, but also the installation of current instantaneous trip protection. Capacity the 800KV · A and the above oil-immersed transformers and 400 KV A and above workshop oil-immersed transformer should be installed in accordance with the provisions gas protection (also known as gas relay).
Capacity of 400 KV · A and above the transformer, when the number of parallel operation or a single run, and other load standby power should be installed according to the load may overload protection. Overload protection and the protection of the gas in the minor fault (commonly known as "light gas"), action on the signal, and other protection, including gas protection in severe failure (commonly known as "heavy gas"), and general movement in the trip.
High pressure side of 35KV and above the factory step-down substation main transformer shall be equipped with overcurrent protection trip current protection and gas conservation; may overload, but also need to be installed overload protection. But if the transformer capacity of a single run in the 10000KV · A and above and parallel operation of each of the transformer capacity in 6300KV · A and above, requires the installation of longitudinal differential protection to replace the current instantaneous trip protection.
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