(1) Generator protection: Generator protection has stator winding phase-to-phase short circuit, stator winding grounding, stator winding turn-to-turn short circuit, generator external short circuit, symmetrical overload, stator winding overvoltage, excitation circuit one point and two points grounding, loss of magnetism Failure, etc. The exit mode is shutdown, unwinding, narrowing the scope of the fault and signaling.
(2) Power transformer protection: Power transformer protection has winding and its lead-out phase-to-phase short circuit, neutral point direct ground side single-phase short circuit, winding turn-to-turn short circuit, external short circuit caused overcurrent, neutral point direct grounding power network external grounding Overcurrent caused by short circuit and neutral point overvoltage, overload, oil level decrease, transformer temperature rise, tank pressure rises or cooling system failure.
(3) Line protection: According to different voltage levels, the neutral point of the power grid is different. The length of the transmission line and the cable or overhead line are different: phase-to-phase short circuit, single-phase grounding short circuit, single-phase grounding, overloading, etc.
(4) Busbar protection: The busbars of power plants and important substations should be equipped with special busbar protection.
(5) Power capacitor protection: The power capacitor has a capacitor internal fault and its lead-out short circuit, the connection line between the capacitor bank and the circuit breaker is short-circuited, and the overvoltage and capacitor group overvoltage caused by a certain fault capacitor in the capacitor bank are removed. The connected busbar is out of pressure.
(6) High-voltage motor protection: high-voltage motor has stator winding phase-to-phase short circuit, stator winding single-phase grounding, stator winding overload, stator winding low voltage, synchronous motor out-of-step, synchronous motor loss of magnetism, and synchronous motor with non-synchronous inrush current.
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