Tips for finding DC ground faults
1. Find out on time. The DC fault is extremely unstable and can lead to hidden hazards that are challenging to identify since it frequently varies with changes in the environment and climate. If there is a problem, it needs to be found right away.
2. Check the DC system's ground insulation on a regular basis. There is no need to locate and troubleshoot a defect when it arises. A high-precision search device should examine every DC circuit on a regular basis, and DC circuits with inadequate insulation should be noted. The importance of monitoring should increase as the climate gets wetter. Currently, a few power plants and substations have implemented this technique and started to set up this regular activity.
3. The operating, control, and protection circuits should be found after the signal and accident lighting circuits in order to more efficiently identify the issue spot. Keep an eye out for circuits with inadequate insulation.
4. The loop switch needs to be turned off by the DC system that powers the loop. If the loop cannot be closed objectively, the detected ground fault loop's grounding accuracy (loop grounding, typically represented by two or more loops) should be carefully classified into different types. Then, the loop with the more serious grounding should be identified, and the search should proceed.
5. Select specialized search tools. In most circumstances, there is more than one site of origin for severe ground alarms. Start by identifying circuits with severe ground faults and work your way down to circuits with lower fault levels using high-precision detection equipment.
The DC system feeder network connection is complicated, but it can be separated into positive and negative grounding based on the grounding polarity. There are two types of grounding: direct grounding, also known as metal grounding or full grounding, and indirect grounding, also known as non-metallic grounding or semi-grounding. There are also three types of grounding situations: single-point, multi-point, and loop. Reducing insulation and grounding. A positive ground connection may be the reason a circuit breaker trips mistakenly, according to studies. A positive ground can trigger the circuit breaker to trip as all of its trip coils are coupled to the negative supply. The circuit breaker may trip and refuse if there is a negative ground.
