The grounding of the DC system should include two situations: the one-point grounding of the DC system and the two-point grounding of the DC system.
In the DC system, the DC positive and negative poles are insulated from the ground, and no damage is caused when one pole is grounded because there is no path that constitutes the grounding current, but the long-term work of one pole grounding is not allowed, because when the grounding is generated at another place at the same pole, it may form the incorrect action of signal equipment, relay protection or control loop; After generating a little ground, and then generating another pole ground, a DC short circuit will be formed.
If the DC positive electrode is grounded, there may be a malfunction of relay protection. Because the general trip coils (such as the outlet intermediate relay coil and the tripping, closing coil, etc.) are connected to the negative power supply, if these circuits are grounded or insulation poorly, it will cause relay protection malfunction. DC negative grounding and positive grounding are the same principle, if there is a little grounding in the circuit, it may form a relay protection rejection action, so that the accident will expand beyond the level.
The two poles and two points are grounded together will trip or short circuit the closing circuit, which may not only blow the fuse, but also burn out the contact of the relay.
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