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2024-12-11 20:31 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 M201。Z equip domestic autotransformers and imported transformers with such devices). Highvoltage 110 – 750kV circuit breakers. The national (allRussian) power work employs over 30,000 circuit breakers rated for from 110 to 750 kV of which % are 110kV breakers, % are 220kV breakers, % are 330kV breakers, 3% are 500kV breakers, and % are 750kV breakers. Over 50% of the installed circuit breakers are tanktype oil switches rated for the voltage of 110 and 220 kV (58% are rated for 110 kV and 45% are rated for 220 kV). From the 1930s to the 1980s tanktype oil switches (MKP and U) have been produced by the Ural233。lektroapparat Plant and then by the Ural233。lektrotyazhmash Production Association. Livetank circuit breakers for 110 and 220 kV constitute % of the total number of installed breakers (27% 110Kv and 17% 220kV). These are VMT110 and VMT220 circuit breakers produced by Ural233。lektrotyazhmash (U201。TM), MMO110 Bulgarian circuit breakers, and a small number circuit breakers imported from ASEA and other foreign panies. VMT110 and VMT220 breakers are being produced until now. In 2020 they were shipped in an amount of 285 pieces, in 2020 they were shipped in an amount of 320 pieces. The respective numbers of VMT220 breakers are 15 and 30 pieces .The 4 amount of air circuit breakers is equal to % of the total number of installed breakers (12% 110kV, 35% 220kV, and 97% 330 and 500kV). Air breakers of the VVN, VV, VVB, VVD, and VNV series have been produced by the 201。lektroapparat and Ural233。lektrotyazhmash Plants. Until 1996 Russian power systems had single SF6 circuit breakers in pilot operation. In 1997 it was decided to equip newly erected and reconditioned 330 and 750kV substations of the RAO ―E201。S Rossii‖ Co. with SF6 circuit breakers. The number of such breakers increased progressively and now amounts to 4%.SF6 columntype and tanktype circuit breakers are supplied by U201。TM (primarily 110kV breakers with breaking current of up to 40 kA), by the Power Mechanical Plant (110 and 220kV tanktype breakers), and by foreign producers (ABB, Alstom, Siemens). A considerable part of the oil and air circuit breakers operating in the united national (allRussian) electric work are rated for 110 and 220 kV and have exhausted the specified service life. This is 35% of the total number of breakers in operation. Niy percent of the MKP110 and VVN110 breakers, 40% of the U110 breakers, and 50% of the VVN220 breakers have exhausted their specified service life. The damageability of circuit breakers is determined in terms of the failure flow calculated as the ratio of the total number of all kinds of failure to the total service life of the breakers counted in breakeryears. For domestic highvoltage circuit breakers of the VV series rated for 110 – 220 kV the failure flow parameter is – per year。 for the 500 – 750kV switches it is – per year. According to the data of CIGRE the mean failure flow for 110kV and highervoltage breakers is per year. The worst
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