Abstract
The management of the power transformer population is a complex process, as the grid companies operate thousands of devices. For this issue, the health index method can be applied to facilitate asset management. The algorithm can be used not only in the technical assessment of the individual units, but also to determine the relationships within the whole population. In this paper, the presented health index method consists of periodic oil diagnostics, including the physicochemical properties, dissolved gas analysis, and furfural content, and further assessment in terms of the criticality of the device to determine the technical condition. The algorithm was specifically designed to reflect even the smallest changes of the input parameters in the final score. The performance of the health index was tested on 620 oil analyses from 220 transformers divided into four subpopulations based on the service conditions. The results have proven to be largely dependent on the criticality level and the operating conditions of the device. The analysis of the study group has shown the influence of corrective maintenance on the mean value of the health index score.
Highlights
Power transformers are a key component of the electric distribution system
The health index described in this paper is applicable to the analysis of the transformer population and was designed to facilitate the condition monitoring in the long run
The selection of parameters and their respective weights was based on the guidelines of the technical committees and the experience in operation and diagnostics of power transformers in Polish power grids
Summary
Power transformers are a key component of the electric distribution system. They enable the transmission of electricity from power plants to consumers by linking the systems of different voltage levels. Transformer reliability has been the subject of research by the CIGRE Working Group A2.37 in recent years, the results of which have been presented in [1,2]. The periodic maintenance and technical diagnostics of transformers are widely described in the literature and updated periodically based on recently developed methods. The publications, in the form of standards or technical guides, can be divided into those that are global [3,4] and those that are national [5,6]. The aforementioned publications may be a source for the development of transformer operating instructions for power system operators
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