An online fault diagnosis device and method for a capacitive current transformer
A current transformer and fault diagnosis technology, which is applied in the direction of measuring devices, instruments, and measuring electrical variables, can solve problems such as difficult to diagnose initial faults, threaten the normal operation of current transformers, and lack of oil in transformers, so as to prevent power grid accidents Effect
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[0028] see figure 1 , The device of the present invention includes a Rowski coil, pre-processing of leakage current signals, a data acquisition system, denoising processing, extraction of characteristic quantities of leakage current, and fault diagnosis. The Rovsky coil can be customized in the manufacturer according to the range and accuracy of leakage current acquisition; the pre-processing of the leakage current signal is composed of a signal amplification circuit, which amplifies the leakage current signal to the acceptable input voltage range of the NI data acquisition card; the data acquisition system consists of Composed of personal computer, NI USB-6215 data acquisition card and supporting LABVIEW software; the denoising process adopts the principle of wavelet threshold value denoising to denoise the leakage current signal; the leakage current feature value is extracted by analyzing and processing the leakage current signal , to extract the sensitive characteristic qua...
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