... for methane mixture gas and coal dust, mine environment and explosion danger, also suitable for ... of high strength, low temperature rise, heat proof performance, easy maintenance etc.Functional characteristics 1. ... conforms to GB8286-2005 the requirement of "mining flame proof movable substations", its no load, load loss ... greater than 95%(25ºC) 4. In the mine, with methane, dust explosion danger is well ...