METHOD AND DEVICE FOR DIAGNOSING DETERIORATION OF LIGHTNING ARRESTER

摘要

PROBLEM TO BE SOLVED: To diagnose deterioration of a nonlinear resistance element of a lightning arrester, and to proactively prevent cracks of the nonlinear resistance element.;SOLUTION: If a lightning current having a prescribed specification flows through the lightning arrester is assumed, if the maximum value of fracture energy Q shown by the product of a thermal stress σ and an elongation Δr in the radial direction of the nonlinear resistance element at that time exceeds a management value Q_L, it is discriminated that there is a possibility of generation of cracks in the nonlinear resistance element by the lightning current having prescribed specification values.;COPYRIGHT: (C)2011,JPO&INPIT