On-line Capacitor Equipment Monitoring Using a Synthetic Relative Measuring Method

Abstract

Capacitive equipment in a power system's insulation may be successfully monitored using on-line measurements 
for dielectric loss angle. The synthetic relative measuring approach not only fixes the problems with the old 
absolute measuring method, but it also significantly boosts the precision of determining the dielectric loss angle. 
However, modern studies only discuss the use of a synthetic relative measurement approach based on two or 
three pieces of capacitive equipment, which lacks the property of universality but is what is being used in 
practice. The article explains how the synthetic relative measurement concept works. To illustrate the failure 
judgment matrix for N pieces of equipment, we use an example of application based on three and four pieces of 
capacitive equipment operating in the same phase as an illustration. These matrices provide for a more generic 
method of monitoring the failure state of N separate pieces of capacitive equipment. Finally, the study puts out a 
few issues that need to be addressed and two diagnostic approaches utilized in diagnostic systems to help direct 
the usage of synthetic relative measurement on local.