多年来,加拿大的采煤工作面使用550伏、3相、60赫芝的电源。最近,由于采用大功率的要求,提议采用1100伏。这种变化,对使用来说是有利的,但对矿山安全方面来说,由于短路可能性的增加又带来了不安全。众所周知的现象之一,就是沼气火焰产生自由离子,火焰的前部是使极性相反 For many years, Canada’s coalface used 550 volts, 3-phase and 60 hertz power. Recently, it is proposed to use 1100 volts due to the requirement of high power. This change is good for use, but adds insecurity to the mine safety aspect as the possibility of short-circuits increases. One of the well-known phenomena is that the biogas flames generate free ions and the front part of the flame is opposite in polarity