Principles and characteristics

The piercing-type external gap surge arrester is suitable for 10kV overhead insulated conductors in power distribution. It employs a patented piercing-type arc-starting head structure, which can penetrate the insulation layer of the induction conductor to form an electrical connection. The lower end of the arc-starting head and the upper end of the surge arrester form a series external discharge gap with a spacing of 60~130mm. The spacing is adjusted by the relative movement of two mounting plates at the bottom of the surge arrester. Under normal conditions, the high-resistivity arrester resistor and the discharge gap do not operate. Only when a specified lightning overvoltage occurs can the discharge gap be broken down, forming a short-circuit path. The subsequent power frequency arc then burns in the external gap, releasing voltage energy to protect the conductor from burns. After the voltage is released, the arrester resistor returns to its high-resistivity state.

Technical parameters and selection table for puncture-type external gap surge arresters

Line overvoltage protector                                                                                                                   Voltage testing grounding ring