The influence of heavy load to the dielectric loss factor measure and the improvement

As for capacitance type equipment, its dielectric loss factor test is influenced by the change of voltage on its ends when it was somewhat ageing, so when it is monitored, not only need consider the electromagnetic interference outside, but also take into account of the load change. Different from general electric power system, traction's load of traction power system often change a lot which leads to the large float of the end voltage of the transformer's casing, which seriously influence the measure of the factor. The purpose of this paper is to introduce a method to improve the measure method and algorithm to reduce the influence from the vary load. © 2011 IEEE.