METHOD TO DIAGNOSE TECHNICAL CONDITION OF HIGH-VOLTAGE POTENTIAL TRANSFORMER IN NETWORK OF POWER PLANT GENERATOR VOLTAGE

摘要

FIELD: electricity.;SUBSTANCE: method consists in measurement of electric parameters of a single-phase high-voltage potential transformer in nominal operation mode, the primary winding of which is connected between the phase wire of the high-voltage line and earth. In stationary mode they measure electric values, for instance, voltage, on terminals of secondary low-voltage windings of at least three single-phase high-voltage potential transformers connected to a wire of a single-phase. Measurements are carried out within single time multiple to the period of voltage oscillations in the grid. Quotients from division of data from the outlet of the secondary winding of each of three transformers into single-type data from the outlet of the secondary winding of the next single-phase high-voltage potential transformer from the remaining ones are compared. Three ratios are produced, in each two of which there are outlet data of one of three single-phase transformers, but in one ratio this output datum is in the numerator, and in the other one - in the denominator. Violations of the technical condition of one of three single-phase transformers are detected, if difference of quotients from divisions at one moment of time in compared transformers exceeds the specified threshold value. That transformer out of three is accepted as the transformer with disturbance of the technical condition, in which the quotient from division, in which its output datum is in the numerator, reduces, while that quotient from division, in which its output datum is in the denominator, rises.;EFFECT: simplified process of diagnostics of technical condition of single-phase high-voltage potential transformers.