1. Find the way the grounding point. The grounding point is used to find the grounding point, that is, instantaneously open the switch of a direct-current feeder, and quickly closer (the cut time does not exceed 3s). When the ground signal disappears, and each polar voltage is indicated normally, the grounding point is at the back.2, find the principle of picking place:
1 For the DC system of the bipma, it should first judge which busbar is grounded;
2 According to the first time to load, it is important to load, and the DC feed line is checked in the chamber in the room, and then check the battery, charging equipment, and DC bus;
3 Use an instantaneous stop method for the secondary DC feeder (such as accident lighting, signaling device, closing power supply), and the important feed line (such as trip power) that does not allow short-term power outages, then transfer it first, then use Instantly stop looking for a grounding point.
3. Looking for the grounding point in the following order:
1), determine the genitality and grounding degree. The positive and negative electrode voltage is measured by the DC insulated monitoring device. When the insulation is good, the positive and negative electrodes are equal or zero; if the positive electrode voltage is raised or equal to the bus voltage, the negative electrode voltage is lowered or equal to zero, the negative electrode insulation is lowered or grounded; contrary to the positive electrode insulation or grounding or grounding .
2) Check if the DC feed line loop of the maintenance equipment or the just-transmitted device is grounded.
3) Check whether DC lighting and power loop are grounded.
4) Check whether the flash device is grounded, and the DC insulation monitoring device is grounded.
5), check control, whether the signal circuit is grounded (the relevant protection is disabled first).
6) Check if the charging device and the battery are grounded.
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