Use of implosion detection leak relays: this mine implosion detection leak relays are used in well mines with explosive and dangerous gases (methane) and coal dust, in conjunction with the general feed switch in the insulation grid at the three-neutral points of exchange of 50hz and voltage to 660v, to achieve the first-level or second-level selective leak protection (jjb-a) to prevent physical damage and to limit the expansion of other accidents due to leakage
