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目前煤矿地面变电所6～10kW系统大量装用了BMΓ—133 Ⅰ、Ⅱ型仿苏高压少油断路器,这种断路器在结构和性能方面都存在很多缺陷,其实际断流容量远远小于额定断流容量,灭弧能力较差,在运行中切断故障电流时曾多次发生喷油和爆炸事故。随着国家电力工业的发展,电网容量越来越大,断路器所需切断的故障电流也随之增加,这种老式高压少油断路器已不能满足客观的需要,为了能可靠切除故障,保证煤矿供电系统的安全运行,应分批用SN_(10)系列高压少油断路器取代BMF—133—Ⅰ型和—Ⅱ型老产品。SN_(10)系列产品采用横吹,纵吹和机械油吹三者结合的灭弧结构,灭弧性能良好,在
At present, the coal mine ground substation 6 ~ 10kW system is equipped with a large number of BM Γ-133 Ⅰ, Ⅱ imitation Soviet high-pressure less oil circuit breaker, the circuit breaker in the structure and performance are many shortcomings, the actual cut-off capacity is far less than Rated current capacity, poor arc extinguishing ability, cut off the fault current in operation has repeatedly fuel injection and explosion accidents. With the development of the national power industry, the capacity of the power grid is getting larger and larger, the fault current to be cut off by the circuit breaker also increases. The old high-voltage oil-less circuit breaker can no longer meet the objective needs. In order to reliably remove faults, Coal mine power supply system for safe operation should be used in batches SN_ (10) series of high-pressure less oil circuit breakers to replace the BMF-133-Ⅰ and-Ⅱ type of old products. SN_ (10) series of products using horizontal blowing, vertical blow and mechanical oil blowing combination of the three arc structure, good arc performance in the