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井下电网的短路过流保护与地面电力系统不同,各级保护均为瞬动。井下现有的高压配电箱。无论是矿用隔爆型(如 pB_2—6或pB_3—6GA)或是矿用一般型(如 GFW—1、GKW—1和 GKFC—1)它们所装的过流继电器一般都是瞬动的。只有作为高压电动机过载保护时,采用 pB_2—6型高压配电箱才可另外附加两个 GL 型反时限过流继电器。此外,有些 GKFC—1和 GFW—1型高压配电箱也装有 GL—15系列继电器。因此,在进行整定计算时,以瞬时过流继电器为主要对象,由于这些继电器都是接于相电流中,接线系数为1,故在计算公式中一般不再出现接线系数的符号。
Underground short-circuit overcurrent protection and ground power system is different, all levels of protection are instantaneous. Downhole existing high voltage distribution box. The overcurrent relays they contain are typically momentary either in flameproof versions of the mine (such as pB_2-6 or pB_3-6GA) or in general mine types (such as GFW-1, GKW-1 and GKFC-1) . Only as a high-voltage motor overload protection, the use of pB_2-6-type high voltage distribution box can be additionally attached to the two GL-type inverse time overcurrent relay. In addition, some GKFC-1 and GFW-1 high voltage distribution boxes are also equipped with GL-15 series relays. Therefore, the tuning calculation, the instantaneous overcurrent relay as the main target, because these relays are connected to the phase current, the wiring coefficient is 1, so the formula is generally no longer appear in the wiring coefficient symbols.