Risk Based Approach for Surge Arrester Replacement
A.P. Purnomoadi, K.G.H. Mangunkusumo, D.R. Jintaka, K.M. Tofani, M. Ridwan

PLN Research Institute

Abstract

Surge arrester is a critical component in tropical countries since the likelihood to have a lightning stroke in the transmission system is higher in comparison to those in sub tropics. Therefore, assuring the reliability of this component is important. However, the surge arresters are sometimes being overlooked during the replacement plan because of its insignificant price in comparison to the protected assets. People mostly just install and forget. This paper presents a methodology to replace the High Voltage (HV) and Extra High Voltage (EHV) surge arresters based on the risk of a failure. The statistical reliability curve based on lifetime assessment, the manufacturer-made, and the condition assessment based on 4955 resistive leakage currents define the likelihood of failure. While the consequences are based on the ENS (Energy Not Served) and type of served customers. The risk-based approach is beneficial for replacement prioritization when resources (budget, spares, workability) are limited.

Keywords: Surge Arrester; Maintenance; Risk-based maintenance; Condition Assessment

Topic: Electrical Engineering