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一、概况国内水电站高压开关站目前普遍采用40公斤/平方厘米和60公斤/平方厘米压缩空气系统,经减压至25公斤/平方厘米使用,减压比为40/25=1.6和60/25=2.4倍。我国不少电站所在地区日温差大,而减压比小,不能满足压缩空气干燥要求,致使空气断路器出现凝结水,引起断路器爆炸等事故,影响发电送电。如丰满水电站采用40公斤/平方厘米压缩空气系统.BB—220型和 DCVF—220型空气断路器大修时均发现消弧室、瓷管和阀体有水的痕迹,几乎所有断路器和贮气罐都有凝结水。东北有些地区进口的 BB—35、DCVF 产品,由于瓷套内壁空气中水汽凝结,绝缘破坏,引起产品爆炸。云南地区 KW_2—220型产品,发现
I. Overview Domestic hydropower station high-voltage switchgear is now generally used 40 kg / cm and 60 kg / cm 2 compressed air system, decompression to 25 kg / cm 2, the decompression ratio of 40/25 = 1.6 and 60/25 = 2.4 times. Many hydropower stations in our country have large daily temperature difference and small decompression ratio, which can not meet the requirements of compressed air drying. Condensation of water occurs in air circuit breakers, causing the explosion of circuit breakers and other accidents, affecting power generation and transmission. Such as the plump hydropower station with 40 kg / cm 2 compressed air system.BB-220 and DCVF-220 air circuit breakers overhaul were found arc chamber, porcelain and body water marks, almost all circuit breakers and gas storage Cans have condensed water. Some parts of the Northeast imported BB-35, DCVF products, as the inner wall of porcelain sets of water vapor condensation, dielectric breakdown, causing the product explosion. Yunnan region KW_2-220 type products, found