Classification of partial discharge patterns in GIS using adaptive neuro-fuzzy inference system

Abstract

Partial discharge (PD) measurement is among the most important methods of diagnosing insulation systems in high-voltage equipment. It is a convenient means of evaluating the state of the insulation and its prospective condition. PD activities may arise from various defects, and they vary according to the defects that cause them. The PD patterns that are generated by three laboratory models of defects in gas-insulated switchgears (GISs) are recorded and analyzed. This research involves PD tests that involve three sets of GIS apparatus with prefabricated defects. Five of 74 statistical PD features were selected as the inputs of adaptive neuro-fuzzy inference system (ANFIS) according to the training errors in 10000 epochs. The ANFIS was utilized to construct a fuzzy inference system (FIS). This FIS was then used to identify the source of the PDs. The results reveal that ANFIS classification has a high success rate, reaching an acceptable classification accuracy 91.5% at the lowest possible test voltage.

Keywords:

• partial discharge
• gas-insulted switchgear
• ANFIS
• pattern classification

Acknowledgment

The authors would like to thank the National Science Council of the Republic of China, Taiwan, for financially supporting this research under Contract No. NSC 99-2221-E-011-148-MY3.