Charge in the process of moving forward and insulation of heat generated by friction

Sometimes people also find the insulating material surface creepage white marks, because the charge in the course of  power transformers  and the insulating material of the heat generated by friction, but not enough to make an insulating surface carbonization, but it has the inside the insulating material decomposed to produce gas, resulting in a  electri cenergy meter  surface of insulating material creepage traces. Because of this creepage traces insulating material qualities, it is known as "white marks." Sometimes the tear tape "white marks" of insulation board, can be found inside  electric meter  has obvious signs of carbonation. This is because the charge in the forward movement, and the resulting gas to the insulating material surface creepage arched obvious traces (ie, that of the "white scratch"). Therefore, regardless of the surface of the insulating material discovered the "black mark" or "white marks" can be considered to have occurred along the surface discharge.