Abstract
The issues of high-voltage transformer technical condition diagnostics are well described in technical literature. A great number of papers are devoted to insulation defect prevention, to the theory and methodology of pre-emergency situation prediction. However, the problem of modern method practical application of fault isolation in operating transformers has not been paid enough attention. A promising method of solving this problem is isolation of partial discharge (PD) sources in the transformer tank using acoustic location method. The significance of the investigations presented in this paper lies in the fact that the methodology of discharge activity center isolation based on acoustic and electromagnetic location of PD has been developed. The research was carried out using a 110 kV transformer as an example. The measurement method was justified and applied including detection of areas with increased discharge activity using one acoustic sensor and subsequent source isolation by installing 4 sensors at a fixed distance from each other. Time diagrams of PD pulses coming from each sensor were considered. As a result of estimating the signal time delay, the practical possibility of calculating the insulation defective section coordinates with satisfactory accuracy was confirmed. It was shown that the software «Inva (Portable)» can be successfully used for processing and visualizing the results of PD acoustic isolation. The relevance of taking into account the change in the pulse propagation velocity in the nonuniform medium of an oil-filled transformer was noted. The development prospects of the considered technology were outlined, among other things; special attention was paid to the new method development to improve the isolation accuracy of PD sources and to integrate such solutions into the high-voltage equipment continuous monitoring systems.
Keywords
power transformer, insulation, state, defect, isolation, partial discharges, acoustic isolation, practical application, results, recommendations
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