In recent years, photovoltaic power generation systems have developed rapidly, and the construction of cost-effective and profitable photovoltaic electric fields reflects the most important goals and core competitiveness of solar energy equipment manufacturers. In fact, the economic benefits not only depend on the efficiency of the solar module itself, but also closely related to the components of the supporting system. High-quality supporting parts can ensure the efficient, stable and long-term operation of the solar photovoltaic power generation system. In the solar photovoltaic power generation system, the amount and cost of cables are the basis of supporting electrical equipment. The usage of these cables is larger than that of general power generation systems, and it is also one of the important factors affecting the efficiency of the entire system.
In the photovoltaic power generation project, the construction cost of the cable engineering is generally relatively large. The selection of the laying method directly affects the construction cost. Therefore, the rational planning and correct selection of the laying method of the cable is an important part of the cable design work.
First, the laying of cables
The cable laying method shall be comprehensively considered according to the engineering conditions, environmental conditions, cable specification and model number, quantity and other factors, and shall be selected according to the requirements of meeting the requirements of reliable operation and easy maintenance and technical and economical rationality. The laying of DC cables for photovoltaic power generation projects mainly involves the laying of sand-laying tiles, pipe-laying, laying in trenches, laying of cable trenches, laying of tunnels, etc. The laying of AC cables is not significantly different from that of ordinary power systems.
DC cables are mostly used between photovoltaic modules, between strings and DC combiner boxes, and between combiner boxes and inverters. The cross-sectional area is small and the number of cables is large. Under normal circumstances, the cables are laid along the assembly brackets or directly buried through pipes. , generally consider when laying:
(1) Connect the cable between the components and the connection cable between the string and the combiner box, use the component bracket as the channel support and fixing of the cable as far as possible, which can reduce the effect of environmental factors to some extent.
(2) The stress of the cable laying should be even and appropriate, and it should not be too tight. Generally, the temperature difference between the day and the night in the photovoltaic site is large, and the cable breakage caused by thermal expansion and contraction should be avoided.
(3) Photovoltaic material cable leads on the surface of the building should consider the overall beauty of the building, and the laying position should avoid laying cables on the sharp edges of the wall and the bracket so as to avoid short circuit caused by cutting and grinding damage to the insulation layer or being cut off by shear force. The wire caused an open circuit. At the same time, we must consider the issue of direct lightning strikes on cable lines.
(4) Reasonably plan the laying route of cables, reduce cross-over, and combine and lay as much as possible to reduce the amount of earth excavation and cable usage during the construction of the project.
Second, the cable connection
The DC cables in the photovoltaic power generation system are mostly laid outdoors. The connection method is mainly based on connector plugging, which can be protected by pipe fittings. The component brackets are used as the channels for cable laying and fixing to reduce the impact of environmental factors. The other cable connections are generally the same as the cable connections in the general power system.
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| Company name | TOSHIBA ELEVATOR AND BUILDING SYSTEMS CORPORATION (TELC) |
|---|---|
| Head office | 72-34, Horikawa-cho, Saiwai-ku Kawasaki, 212-8585, Japan |
| Established | February 18, 1967 |
| President & CEO | Kazunori Matsubara |
| Business line | Development, design, testing and inspection of elevators Manufacturing, installation and removal of elevators Sales and sales intermediation of elevators Maintenance, repair and modification of elevators Monitoring and control of elevator, electrical, air-conditioning, plumbing and sanitary, crime prevention and disaster prevention equipment, as well as building management Design, construction and management of buildings Machinery and equipment installation work, building work, plumbing work, electrical work, telecommunications work, fire fighting facilities work, and others 22 types of business listed in the Article 2 of the Construction Industry Act Security Business |
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