access icon free Leakage current analysis of polymeric insulators under uniform and non-uniform pollution conditions

© The Institution of Engineering and Technology
Received 03/01/2017, Accepted 19/05/2017, Revised 09/04/2017, Published 06/06/2017

This study presents two different methods under uniform and non-uniform pollution layer in order to measure and calculate the leakage current (LC) of silicone rubber insulators. Experimental test for evaluating the LC analysis of polluted insulator have been done in a laboratory clean fog chamber. The electric field and potential distributions were obtained from finite element method software for 3D models. The mathematical background and circuit theory are described in details by a section of insulator and using the extended form factor formula. The surface conductivity used in the calculations was extracted from the measured LC after wetting rate. LC characteristics under 1 : 1, 1 : 2, 1 : 5 and 1 : 10 ratios of top to bottom surface salt deposit density on polymeric insulators are studied. To verify the proposed models of this study, the results of experimental data and two other approaches are compared with together before dry-band formation. Moreover, a dynamic LC model under uniform pollution layer has been introduced and extended in order to calculate the LC when the formation of dry-bands along the insulator surface occurs. The dynamic model is drawn from experimental data and measured surface conductivity.

Inspec keywords: electric fields; fog; polymer insulators; surface conductivity; silicone rubber insulators; wetting; finite element analysis; insulator contamination; leakage currents

Other keywords: finite element method software; bottom surface salt deposit density; polluted insulator LC analysis; potential distributions; 3D models; circuit theory; electric field; wetting rate; laboratory clean fog chamber; polymeric insulator leakage current analysis; dynamic LC model; uniform pollution conditions; silicone rubber insulators; nonuniform pollution conditions; dry-band formation; extended form factor formula; surface conductivity

Subjects: Power system protection; Power line supports, insulators and connectors; Finite element analysis; Environmental factors

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