Electrical properties of photovoltaic cables

1. DC resistance

The DC resistance of the conductive core of the finished photovoltaic cable at 20℃ is not greater than 5.09Ω/km.

2. Water immersion voltage test

The finished cable (20m) is immersed in (20±5)℃ water for 1h and then subjected to a 5min voltage test (AC 6.5kV or DC 15kV) without breakdown.

3. Long-term DC voltage resistance

The sample is 5m long and placed in distilled water containing 3% sodium chloride (NaCl) at (85±2)℃ for (240±2)h, with both ends exposed to the water surface for 30cm. A DC voltage of 0.9kV is applied between the core and the water (the conductive core is connected to the positive pole and the water is connected to the negative pole). After taking out the sample, a water immersion voltage test is carried out, the test voltage is AC 1kV, and no breakdown is required.

4. Insulation resistance

The insulation resistance of the finished photovoltaic cable at 20°C shall not be less than 1014Ω·cm,

The insulation resistance of the finished cable at 90°C shall not be less than 1011Ω·cm.

5. Sheath surface resistance

The surface resistance of the finished cable sheath shall not be less than 109Ω.