Ground fault protection method of nuclear plant low-voltage power distribution system in all power supply ranges
A low-voltage power distribution system, grounding fault technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of unintended effects of the integrity and sensitivity of the implementation scheme, lack of system integrity, etc., to achieve small size, Simple installation and simple implementation
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[0019] In the embodiment of the present invention, such as figure 1 As shown, the ground fault design of the full power supply range of the low-voltage power distribution system of the present invention includes:
[0020] Set up a current transformer on the connecting line between the neutral point of the transformer and the grounding system, and configure a high-sensitivity grounding fault relay.
[0021] Such as figure 2 As shown, the ground fault protection of the low-voltage power distribution system of the nuclear power plant only sets the current transformer 001TI on the connection line between the neutral point of the transformer and the grounding system, and 001TI uses a conventional current transformer without special technical requirements, for example: 5A, the current transformer 001TI signal acts on the high-sensitivity ground fault relay 001XI, and its residual current protection detects the phasor sum of the three-phase current plus the neutral line current, th...
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