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目前井下使用的高压防爆配电箱(以下简称配电箱)主要有两种,一种是沈阳高压开关厂生产的 PB_3—6型,一种是西安高压开关厂生产的 PB_2—6改型。经过多年来现场使用,认力 PB_3—6型配电箱各种电气性能是比较好的,维修起来也比较方便。而PB_2—6改型配电箱则存在一点问题,特别是过流机构动作的可靠性较差,无论是在我
At present, there are mainly two kinds of high-voltage explosion-proof distribution boxes for underground use (hereinafter referred to as distribution boxes), one is PB_3-6 type manufactured by Shenyang High-voltage Switch Factory and the other is PB_2-6 modified by Xi’an High-voltage Switch Factory. After years of on-site use, PB_3-6 power distribution box of various electrical performance is better, more convenient to repair. The PB_2-6 modified distribution box there is a problem, especially the reliability of over-current institutions move less, whether in me