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The authors would like to thank the Spanish Ministry of Economy and Competitiveness for partially funding this work under projects DPI2015-71219-C2-2-R and DPI2015-66478-C2-1-R, and they would like to acknowledge the support of the Chilean Research Council (CONICYT), under the project Fondecyt 11160115.

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Partial discharges: keys for condition monitoring and diagnosis of power transformers

Publicated to:Power Transformer Condition Monitoring And Diagnosis: Concepts And Challenges. 104 39-85 - 2018-01-01 104(), DOI: http://dx.doi.org/10.1049/https://doi.org/10.1049/PBPO104E_ch2

Authors: Albarracin, Ricardo; Robles, Guillermo; Alfredo Ardila-Rey, Jorge; Cavallini, Andrea; Passaglia, Renzo

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Abstract

The combination of thermal and electrical stress, in conjunction with the synergic effects of moisture in the insulation, might dramatically reduce the lifetime of a power transformer, which is roughly estimated to be 40 years if properly maintained, meaning that many transformers do not experience any failures before being dismantled. Mechanical stresses during short-circuits can also play a role leading, in the worst case, to the radial buckling of the winding and damage of the connection cables at the bushing terminations. A number of these factors can, in the course of time, give rise to partial discharge (PD) phenomena which can be a cause of failure or a symptom of degradation. PD measurements can be carried out conventionally, following the standards IEC 60270 and IEC 60076. Alternative methods, such as those presented in the IEC TS 62478 standard based on acoustic or ultra-high frequency sensors, have been proposed and might offer better sensitivity, particularly for monitoring purposes, and the capability to locate the PD sources. For all these methods, identification of the PD source is a key to achieve a correct course of action (run, repair and replace).

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