| In this paper, we aim at using one transformer supplying power not only to the user on the ground, but also to the well of colliery in our country. It is easy to cause many more accidents, and the instances with serious safe hidden trouble which do not satisfy The Regulation of Coal Mine's Safety that "strictly prohibit the neutral point of transformer in the well directly earth to ground; and strictly prohibit the transformer on earth whose neutral point directly earth to ground supplying power to the well straightly". According to this instance, we develop a kind of equipment, named Safely Power Supply With Isolation and Arc Eliminating System in Mine. The equipment fulfill The Regulation of Coal Mine's Safety and The Regulation of Safely Using Power in Low Voltage at the same time. And the settling project can using only one transform to supplying power to the ground and well, and satisfy the request of safely supplying power at the same time. And, According to the theory of picking-up the reactive current, advanced a new method of measuring the capacitive current. By the ways of theory and experimentation, it is validated that the method is secure. On the basis of measuring the capacitive current, the paper rebuild the method of divide the syntonic capacitance in the system. We using single-chip computer 80C 196KB to control pick-up the capacitive current, and calculate the value of capacitance, and divide the capacitance by tow-heading SCR. In this system, the 8 rating capacitance fit together by the way of looking up the list, make the primary rating adjust changing to non-rating adjust, so that consummate the system's design.It is approved by practice that the design of this system can not only solve the problems being mentioned above, but also reduce the investing charge, and create wonderful economic benefit. The design of the capacitive current's automaticcompensate improve the system's real-time ability and dependability, advanced the system's automatization.
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