In a power plant or substation, a grounding network is available. The control panels and automation components may be far apart. If they are grounded on the nearest grounding copper bar, the grounding current of the strong electrical equipment may cause a large potential difference between the two grounding points, which will interfere with the normal operation of the control system. Work. In order to prevent the cross-interference caused by the currents on the grounding wires of different signal loops, the internal grounding wires of the weak current signals must be connected in separate systems (for example, in units of control panels), and then lead to a certain point of the grounding network with wires of a specified area . , so as to realize the single- point grounding of the control system.
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