Discussion of transformer relay protection

Hydropower units and the main transformer relay protection compared with the conventional unit, large hydropower units and the running way of the main transformer and changeful, to adapt to the conditions of operation condition is better than the conventional unit, therefore when carries on the design to increase the pump starter, start the busbar and breaker commutation device at a time, so that at run time can choose according to operating conditions have handle the fault components, typically automatic and fast from the removal of faults in the power system components, which will be fault element damage degree and on the operation of the whole system to minimize the adverse effects of maximum guarantee trouble-free part can be normal operation.

Hydropower units and the main transformer relay protection is equivalent to the internal structure of open loop automatic control equipment, through the switch, circuit breaker, knife switches, such as a device, from a protected object related to the input signal is compared with the set values for the pre-determined, whether out of hydropower units and the main transformer is in normal operation condition, or if there is a fault occurs, then the corresponding logical judgment, if there is a failure hydropower units and the main transformer, the relay protection device to start issuing commands, the relevant action - or tripping signals.

In hydropower units and the main transformer is the most common fault in the internal winding of turn-to-turn short circuit or short circuit, short circuit between the layers, as well as the external terminal lead and single phase short circuit and short circuit, it is a high sensitivity is proposed for the relay protection device.