The basic structure of a solar cable is composed of a conductor, an insulating layer, and a sheath layer. When the cable passes a certain load current, it will definitely heat up. As the load current gradually increases, the surface temperature of the cable will rise. If it is not handled in time, the consequences may be serious. There are six main reasons why solar cables generate heat during operation.
1. The conductor resistance of the solar cable does not meet the requirements, which may cause the cable to generate heat during normal operation.
2. Improper selection of the model and specification of the solar cable causes the conductor cross-section of the cable to be used to be too small, resulting in overload during operation, long-term use, poor heat dissipation of the cable, and heating.
3. When installing solar cables, the arrangement is too dense, the ventilation and heat dissipation are not good, or the cables are too close to other heat sources, which affects the heat dissipation performance of the cables, and may also cause the cables to generate heat during operation.
4. The joint construction technology is not good, the joint is not tightly crimped, causing leakage or excessive resistance at the joint, and also causing the cable to generate heat.
5. The insulation performance between photovoltaic cables is not good, resulting in low insulation resistance, failing to meet the design requirements, and generating heat during operation.
6. The jacket of the photovoltaic cable is damaged, which will cause slow damage to the insulation performance after water enters, and the insulation resistance will gradually decrease, which will also cause heating during the operation of the cable, and breakdown will occur in severe cases.
After the solar cable generates heat, if the cause is not found to eliminate the fault in time, the cable will have an insulation breakdown after the continuous power-on operation, causing the cable to short-circuit or open the circuit, which may cause a fire in severe cases.
