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POWER TRANSFORMER DIAGNOSTICS METHOD AND DEVICE FOR DETECTING INTERNAL FAULTS
POWER TRANSFORMER DIAGNOSTICS METHOD AND DEVICE FOR DETECTING INTERNAL FAULTS
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机译：电力变压器内部故障检测方法及装置
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摘要
The invention pertains to high-voltage electric systems. A method for diagnosis of power transformer winding fault is proposed, along with a device, by experimentally obtaining the current signals of all the phases of the transformer and recording the instantaneous values of the obtained signals at the moment when the transformer is connected to the grid, as well as by generating the complex value of the signal harmonics and determining the relationships of the higher current harmonics to the base harmonic, which serve as the basis for judging about the existence of turn-to-turn faults. The essence of the invention is as follows: first, the experimentally obtained current signal harmonics are filtered from the arbitrary interference, the exponential component is separated, the signals are divided into the positive and negative half-periods. For the negative half-periods, a discrete Fourier transformation is performed; after that, the ratios of the 5th to 15th harmonic to the base harmonic are determined, which serves as a basis for detecting a turn-to-turn fault.
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