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Aimed at above the fault type and abnormal running state, generator relay protection device should be installed:
(1) for more than 1 mw generator stator winding and lead the interphase short circuit, longitudinal differential protection should be installed.
(2) the direct even in the bus bar of generator stator winding single-phase earth fault, when the single-phase grounding fault current (irrespective of the arc suppression coil compensation effect) is greater than the specified value, should be installed selective grounding protection device.
(3) for the generator stator winding interturn short circuit, star connection, each phase of the stator winding of the parallel branch and neutral side branch terminal, shall furnish transverse differential protection.
(4) for the generator external short circuit caused by the over current, can adopt the following protection way
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