The laying and construction of photovoltaic cables is a significant project. To ensure its regular operation and no failures, it is necessary to eliminate the possibility of problems during laying. The premise of removing issues lies in the construction of cables. Next, Let's look at the problems that need to be paid attention to when constructing lines.
1. Eddy's current problem is 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. However, 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 the eddy current is more significant in the high-current photovoltaic cable system. Therefore, during the construction process, measures must be taken to prevent A steel (iron) closed circuit is formed around the cable to prevent cable from generating eddy currents.
2. Mechanical damage caused by cable rotation
Some photovoltaic cables with too large specifications are challenging to transport and lay due to the large outer diameter. At the same time, the requirements for the turning radius are also stringent. If the turning angle is too large, the inside of the conductor will likely be mechanically damaged. The insulation strength of the cable causes it 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. The 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 line 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 and routine induction. Furthermore, the voltage should not be greater than 100V. Therefore, 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.
4. Safety issues
Safety has always been the top priority, so safety measures must be taken to prevent electric shock when installing photovoltaic cables.
1. Eddy's current problem is 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. However, 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 the eddy current is more significant in the high-current photovoltaic cable system. Therefore, during the construction process, measures must be taken to prevent A steel (iron) closed circuit is formed around the cable to prevent cable from generating eddy currents.
2. Mechanical damage caused by cable rotation
Some photovoltaic cables with too large specifications are challenging to transport and lay due to the large outer diameter. At the same time, the requirements for the turning radius are also stringent. If the turning angle is too large, the inside of the conductor will likely be mechanically damaged. The insulation strength of the cable causes it 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. The 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 line 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 and routine induction. Furthermore, the voltage should not be greater than 100V. Therefore, 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.
4. Safety issues
Safety has always been the top priority, so safety measures must be taken to prevent electric shock when installing photovoltaic cables.