| 摘要 |
FIELD: power engineering. ^ SUBSTANCE: invention is related to methods for remote control of technical condition of electric power (EP) energised equipment. Previous experimental studies of EMI are carried out to estimate value of time interval T, at which EMI spectrum with certain accuracy may be treated as stationary accidental process. Further during interval of time, not less than T, they fix and quantitatively assess parametres of EL internal EMI spectra. From registered EMI they separate spectra of electromagnet radiation generated by partial discharges in internal insulation, including frequency ranges with stably repeated signals with amplitude of spectral lines of at least 20Ç40 dB. Afterwards numeral analysis of fixed spectra is used to form combination of quantitative criteria. In process of subsequent monitoring comparison with formed criteria makes it possible to estimate condition of high-voltage equipment and/or availability of defects in its separate units. Combination of numeral criteria includes maximum, minimum and average values of signal amplitudes, both at separate frequencies and in a certain range and/or its mean-square deviation, and/or value of spectrum energy, and/or value of spectrum envelope modulation frequency. ^ EFFECT: higher reliability of high-voltage equipment technical condition detection. ^ 2 cl |
