Reduce failures caused by solar cable laying works

Reduce failures caused by solar cable laying works

The laying and construction of photovoltaic cables is an extremely important project. In order to ensure its normal operation, if failures occur from time to time, the possibility of problems must be eliminated during laying, and the premise of eliminating problems lies in the construction of cables.

1. Eddy current problem caused by current

In the construction process of photovoltaic cables, some use steel brackets, some use steel protective pipes, and some use cable clips and overhead laying. Any steel (iron) closed loop around the photovoltaic cable can be formed, and the above phenomena may produce eddy currents. It is especially worth mentioning that in the high-current photovoltaic cable system, the eddy current is larger. During the construction process, measures must be taken to prevent A steel (iron) closed circuit is formed around the cable to prevent the cable from generating eddy currents. 2. Mechanical damage caused by cable rotation

Some photovoltaic cables with too large specifications are difficult to transport and lay due to their large outer diameter. At the same time, the requirements for the turning radius are also very strict. It is caused by the insulation strength of the cable until a fault occurs. When the equipment is connected, the connection length of the middle-phase cable head is appropriately shortened, so that the three-phase cable head is not affected by external forces. Practice has proved that the operation effect is good. 3. Grounding problems of medium and low voltage photovoltaic cables

In the public medium and low voltage photovoltaic cables, due to the unequal three-phase load, if the metal sheathed cable is used, the grounding problem of the metal sheath must be considered. At the same time, it should be ensured that the metal sheath is not grounded at any point. Normal induction The voltage should not be greater than 100V. In my opinion, in the medium and low voltage cable network, all cable joints should be provided with grounding electrodes (nets), and the metal sheath should be reliably grounded.