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 to the ground, and do not cause any damage because there is no path that constitutes the grounding current when generating one pole grounding, but it is not allowed to work for a long time on the ground of one pole, and when the ground 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. Since the general trip coils (such as outlet intermediate relay coils and tripping, closing coils, 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 incident will be expanded.
The simultaneous grounding of two poles 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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