Generator Differential ProtectionDifferential protection for a generator primarily safeguards the stator windings against earth faults and phase - to - phase faults. Stator winding faults pose a significant threat, capable of inflicting severe damage on the generator. To protect the stator windings, a differential protection system is utilized to clear faults in the shortest time possible, thereby minimizing the extent of damage.Merz - Prize Circulating Current SystemIn this protection scheme, t

Currently, most secondary equipment in newly - built intelligent substations is placed inside prefabricated cabins located in the switchgear area. After the cabin bodies are manufactured, secondary equipment manufacturers enter the cabins for installation and debugging, resulting in a rather complex and cumbersome construction process. A typical 220 kV intelligent substation usually requires the setup of two prefabricated cabins: one for 220 kV and one for 110 kV. Both cabins are of Type II, wit

DefinitionA differential protection relay is one whose operation hinges on the phase difference of two or more electrical quantities. It operates based on the principle of comparing the phase angle and magnitude of the same electrical quantities.ExampleTake the comparison of the input and output currents of a transmission line as an instance. If the magnitude of the input current of the transmission line exceeds that of the output current, it indicates that additional current is flowing through

Action time characteristicsFixed-time overcurrent protection: the action time of the protective device is fixed, independent of the size of the fault current. No matter how much the fault current exceeds the setting value, as long as the action conditions are met, a pre-set fixed time will elapse before action is taken to trip or signal is issued. For example, if the set action time is 5 seconds, then when the current exceeds the set value, no matter how much it exceeds, the protection will be t