Cable ground fault troubleshooting and precautions

First, cable manufacturing defects are non-qualified products;

Second, the operating environment is harsh, natural aging, and external damage;

Third, the installation is not standardized and the wiring is rough. The root cause of a ground fault is only one - the insulation of the cable.

China's large-scale terrestrial power stations are generally located in the western part of the country. These places are generally deserts, saline-alkali lands, and large temperature differences between days. Rats are also seriously damaged and the environment is very humid. Cable buried and laid, cable trench fill and dig requirements are relatively high; distributed power station cable operating environment is not better than the above ground, the cable will withstand high temperatures, technical personnel measurement and control, roof temperature can reach 100-110 °C The high temperatures, fire retardant requirements of the cable, and high temperatures have a significant effect on the insulation breakdown voltage of the cable. Therefore, the selection design should consider the following points:

1, the insulation performance of the cable

2. Cable moisture, cold and weather resistance

3, heat-resistant flame-retardant cable

4、 Cable laying method

5, conductor material of the cable (copper core, aluminum alloy core, aluminum core)

6, the cross-section specifications of the cable