Experimental study of protection measures for preventing 10kV insulated conductors from breakage caused by lightning stroke

Many protection products of avoiding breakage caused by lightning stroke have been used and have good effect in Beijing. But there are still some breakages existing for the insulated conductors after installing the protection products according to the company technology standard. For these reasons, an experimental research is carried out in order to consummate the former research results of breakage caused by lightning stroke, and provides instructions for the power supply department. The contents of the study are the breakage caused by lightning stroke tests of overhead insulated conductors, the breakage caused by lightning stroke tests of overhead bare conductors, the proof-test of the clamping post insulators and the capability tests of the gaps with the power arc. In the short-time high power arc tests, the two protection products can protect the insulated conductors from being burn down. The problems for those products are analyzed and suggestions are given. Through comparing the burning conditions of the insulated conductors and the bare conductors in case of long-time low power arc tests, it is found that possibilities of the conductors breakage exist when single-phase to earth fault occurs.