Assessment of the Efficiency of Transformers Technical Condition Monitoring Based on Dissolved Gas Analysis

The method of analysis of gases dissolved in oil is one of the most informative methods for early detection of defects in power oil-filled transformers. This determined its wide application in the practice of off-line and on-line monitoring of transformer equipment. In the article, based on the ratio of weight coefficients used in the calculation of the technical condition index of functional units and equipment units, a method for determining the reliability of oil-filled transformer equipment is proposed. An indicator that characterizes the quantitative measure of the diagnostic value of a single method (group of methods) for monitoring parameters of a power oil-filled transformer in the calculations of the technical condition index is obtained. The efficiency of monitoring the state of a power oil-filled transformer was evaluated based on the results of the analysis of gases dissolved in oil. A quantitative example of calculating the economic effect of increasing the operational reliability of a group of 110 kV power transformers in one of the areas of the distribution network using a remote diagnostic monitoring system based on the analysis of gases dissolved in oil is given.