Cable is an indispensable basic equipment for power transmission, information transmission, manufacturing of various motors, electrical appliances, instruments and Realization of electromagnetic energy conversion. It is widely used in various fields of national economy. As an important quantitative packaging length commodity, the net content of cable should be measured and tested in production and operation. In fact, because the cable length measurement and inspection must be carried out in a whole volume, which is inconvenient for measurement, many manufacturers and businesses have not carried out according to the allowable length measurement error specified in the national standard, which leads to the increasingly prominent measurement problems in the market.

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In the process of high frequency power electronic energy conversion, there are sharp rising edge / falling edge pulses and selling changes of different polarity, which make the space charge accumulation effect in insulating materials, and then cause partial discharge, which causes irreversible chemical degradation of insulating materials. Evaluation of insulation performance and aging characteristics of insulation materials under high frequency and fast changing square wave pulse voltage is the key to safe and stable operation of power equipment.

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