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The future trend of inflatable cabinets

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In order to meet the needs of small size, small footprint, good performance and high reliability, various combined electrical appliances and complete sets of electrical appliances have appeared. In addition to switch cabinets, gas-filled cabinets have multi-layer inner grids, load switch fuse combination devices, high voltage corner fuse combination devices (FC cabinet) load switches, fuse and arrester combinations, as well as various combinations of arresters, isolation switches, voltage and current transformers, etc., it has developed advanced types of combined complete sets, such as gas-filled cabinets (C-GIS), fully enclosed combined electrical equipment (GIS), and whole substations, such as prefabricated substations (including transformers) box-type transformers and high and low voltage electrical equipment).

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Due to the rapid growth of electricity consumption in modern life, the increase of industrial and agricultural electricity consumption, and the formation of high-voltage and large-capacity power grids, the requirements for the capacity and various parameters of inflatable cabinets are rapidly increasing. At present, the rated current of the main power transmission and distribution equipment has increased from 1000A to 2500A, to 4000A, and the short-circuit current has increased from 16~20KA to 31.5~50kA, or even higher. The number of single-pole circuit breakers for 550kV circuit breakers has been reduced from 4 to 2, and the development of single-pole circuit breakers is accelerating. If the main transmission and distribution voltage in China cannot increase rapidly, then the inflatable cabinet of large-capacity, high-parameter demand trends in China's power grid will not cool down (higher transmission voltage can unravel some of the ring network's subordinate distribution voltage reductions) short-circuit current of the grid).


Date:2022-09-05

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