Choose the appropriate cable laying method in the photovoltaic power generation system

Reasonable planning and correct selection of the laying method of photovoltaic cables is one of the important aspects of cable design.

When laying cables, consider comprehensively the engineering conditions, environmental conditions, cable specifications, models, and quantities, and select the appropriate laying method according to the requirements of reliable operation, easy maintenance, and technical and economical principles.

The laying of DC cables in photovoltaic power generation projects mainly includes direct burial sand laying, laying through pipes, laying in trenches, laying in cable trenches, laying in tunnels, etc. The laying of AC cables is not much different from the laying methods of general power systems.

DC cables are mostly used between PV modules, between strings and DC combiner boxes, and between combiner boxes and inverters. They have a small cross-sectional area and a large number. Usually, the cables are bundled along the module bracket or passed through pipes. Direct burial for laying, generally consider when laying:

(1) Connecting cables between components and connecting cables between strings and combiner boxes, using component brackets as channel support and fixation for cable laying as much as possible, can reduce the effect of environmental factors to a certain extent.

(2) The force of the cable laying should be uniform and appropriate, and should not be too tight. Generally, the temperature difference between day and night is large in photovoltaic places, and the cable breakage caused by thermal expansion and cold contraction should be avoided.

(3) For the cable leads of photovoltaic materials on the surface of the building, the overall appearance of the building should be considered, and the laying position should avoid laying cables on the sharp edges of walls and brackets, so as to avoid short circuits caused by cutting and abrasion damage to the insulating layer, or cut off by shearing force The wire causes an open circuit. At the same time, problems such as direct lightning strikes on cable lines should be considered.

(4) Reasonably plan cable laying paths, reduce crossovers, and combine laying as much as possible to reduce the amount of earthwork excavation and cable consumption during project construction.