Cold-proof and antifreeze cable detection method

In northern China, especially in the northeast region, the winter temperatures will drop to minus tens of degrees in the winter. In this case, the general power cable has a short construction period during construction, and the outer sheath of the cable becomes brittle, easily cracked, and bends. Weakening and many other disadvantages, forced construction will easily lead to huge material waste and safety hazards. Therefore, special cold-resistant and anti-freeze cables must be used.

China's national standard GB12706 stipulates that the experimental method of cable low temperature resistance test is: at the ambient temperature of -15°C, the power cable sheathing material test piece is stretched, the elongation at break is not less than 20%, and the same - At an ambient temperature of -15°C, use a 1kg weight to release the cable sheathing material from a height of 1m. Check the surface of the material for cracks. In GB50127-2007 "Power engineering cable design specification" and GB50168-2006 "Electrical installation engineering - Cable line construction and acceptance specifications" also provides that PVC (PVC) sheathed power cable construction environment temperature should not be low At 0 °C, the ambient temperature should not be lower than -15 °C.

Combining the above national standards, it is not difficult to find that at present, China's standards for the use of ordinary power cables all stay at the test condition of -15°C, and the installation and use temperature is 0°C, and the construction of cold and frost-resistant cables for the cold regions in the northeast and northern Inner Mongolia There is no specific guidance data.

Internationally accepted CSA22.2No. In the 51-94 standard, the ambient temperature of the power cable for low temperature resistance test is specified at -40°C and -25°C. The cold bending test of the cold-resistant and antifreeze cable body and the cooling will be performed when the test method is increased by -40°C compared to the national standard. The weight for the impact test was increased from 1 kg to 1.36 kg, and the test conditions were more severe.