Design And Research On Core Parts Of 12 KV Large Current Switch Cabinet

As countries new urbanization, agricultural modernization gradually accelerated, new energy, distributed power supply, electric vehicles, energy storage device have developed rapidly, the terminal load appears the new trend : :fast increase, big change, diversification, countries speed up the distribution network upgrade, comprehensively improve the quality of urban and rural power supply.12 kv switch cabinet in distribution power system, and control the opening and closing, in the process of energy conversion and protection, is the core equipment of power distribution network system, At present a large number of applications of switch cabinet rated current is 2000 A and 2500 A two gears, already cannot satisfy the grid application, needs to be rated current of 4000 a large current switch cabinet replaced its existing equipment..Distribution network upgrade whose connection mode, equipment foundation, butt size has been fixed, is obviously different from the newly-built grid. and it will be big and current switch cabinet will have in the cabinet put oneself in another position size and main wiring interface consistent with the original switch cabinet. This also requires the big current switch cabinets have the same size and main wiring interface consistent with the original switch cabinets. It makes the original enlarge space dimension, enlarging the current-carrying way of switch cabinet rated current method is not applicable.According to the specific requirements of 4000 A rated current, this paper considers the 12 KV switch cabinet insulation characteristics and use characteristics, analyses the heating mechanism and thermal characteristics, uses solidworks software to mode build the current-carrying components and the overall structure, give full play to the PHOENICS software to the specialty of simulation calculation of heat flow, calculates two kinds of working condition, the natural cooling and forced air cooling system. According to the result of the simulation calculation, and ultimately determine the forced cooling system and the structure of the circuit breaker room double grounding switch cabinet design structure.