Диагностика силовых трансформаторов длительное время находящихся в эксплуатации

Abstract

Improvement of power transformer condition diagnostic being in service long time. The theoretical aspects of the paper are based on theory fundamental statements of electrical apparatus and material engineering. Experimental investigations were realized by monitoring data incisive analysis of capacitor (С) and approximate power factor (tgδ) of autotransformer bushing 550 kV on operating equipment. Results and observational analysis are given. They show that power transformer diagnostic recommended methods in operation do not be able to in full detect defects with accumulative character appearing during a continuous exploitation period. In addition to the existing methods of power transformers diagnostic to use a technique based on the registration of partial discharges is proposed. It allows detecting insulation defects at early stages of development. Due to the fact that current value of particle discharges is not large especially in the initial stages, it make sense for studding of partial discharges in transformer insulation to fix electrical field and acoustic signals generating partial discharges. Practical value for electrotechnical branch is improvement diagnostic and enhancement of safety of substation equipments exploitation.