What are the common faults and causes of photovoltaic cables?

The common faults of photovoltaic cables include mechanical damage, insulation damage, insulation moisture, insulation aging and deterioration, overvoltage, cable overheating fault, etc. When the above faults occur in the photovoltaic cable, the power supply of the faulty photovoltaic cable shall be cut off and the fault point shall be found, and then the faults shall be checked and analyzed for maintenance and testing. The cut-off can be resumed after troubleshooting. The most direct cause of photovoltaic cable failure is that the insulation strength is not enough and is often broken down.

The main causes of photovoltaic cable failure are:

1、Overload operation of photovoltaic cables: long-term overload operation will increase the temperature of photovoltaic cables and aging the insulation, leading to insulation breakdown and reducing the construction quality;

2、Electrical: the construction technology of photovoltaic cable head can not meet the requirements, and the sealing of photovoltaic cable head is poor. When water invades the photovoltaic cable, the insulation performance of the photovoltaic cable decreases. No protective measures were taken when the photovoltaic cable was laid, the protective layer was damaged and the insulation was reduced;

3、During installation: poor underground drainage, long-term water immersion of photovoltaic cable, damage to insulation strength. If the working well is too small, the bending radius of the photovoltaic cable is not enough, and it will be damaged by external force after a long time. Mainly in municipal construction machinery savage construction, dig and cut photovoltaic cable;

4、Corrosion: the protective layer is corroded by chemical corrosion or photovoltaic cable for a long time, which leads to the failure of the protective layer and the reduction of insulation;

5、The quality of the photovoltaic cable itself or the cable head accessories is poor, the sealing of the photovoltaic cable head is poor, and the insulation glue is dissolved and cracked. The resonance phenomenon at the platform is that the photovoltaic cable disconnection fault leads to the resonant circuit formed by the phase capacitance and ground capacitance of the photovoltaic cable and the excitation inductance of the distribution transformer, thus exciting the ferromagnetic resonance.

In short, photovoltaic cable whether in the laying or in daily use will inevitably appear all kinds of fault problems, when we deal with these problems are need to repair the fault, so we need to pay attention to the safety of the use of photovoltaic cable at any time.

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