Large Power Transformer Condition Assessment and Life Extension

Abstract

The unsteady implementation of the conceptual model of deregulation of electric utility industry in many countries has caused significant consequences in the overall health of the general population of large power transformers [LPTs]. LPTs are now subject to adverse conditions due to advanced aging, decreases in routine testing and maintenance activities, reduction of capital for repair and replacement, increased loading and lack of technical expertise.The method presented in this paper provides a blueprint to successfully determine the overall health and condition of LPTs.

Life extension decision making of safety critical systems: An overview

“…In the electrical/electronics industry, several life extension case studies have been conducted on generators (see [27,32]), circuit breakers (see [5]), transmission lines and High Voltage Direct Current (HVDC) systems (see [25,42,43,55,60,81]), transformers (see [8,12,14,22,30,31,34,44,45,46,47,58,71,87]), control and instrumentation systems (see [26,41,51,72]), switch gears and relays (see [53,76]), cables (see [61]), silicon coating ( [21]), Static VAR compensator (see [91]) and power converters (see [24]).…”

“…Ishac et al [35] used visual inspection information as well as design documents to assess the condition of existing transmission facilities including conductors, wires, hardware, insulators and structures for life extension. Godswill et al [58] and Sharafi [71] developed qualitative condition assessment approaches for life extension of power transformers using oil diagnostics, visual inspection and review of historical data. Hudson [69] applied a qualitative risk based assessment technique to determine the extent of technical vulnerability of SCEs on offshore platform for life extension.…”