发明名称 On-line transformer condition monitoring
摘要 This invention is used to determine the condition of power transformers using real-time on-line high speed measurements. Specifically, a failure prediction method is described. This provides alerts prior to a catastrophic event that could cause major damage to the transformer and resulting business losses. Real time absolute phase angle and frequency as well as real and reactive power measurements from both sides of the transformer are used to estimate frequency domain transfer functions. The transfer functions are in fact the complex admittance functions relating the input and the outputs from the transformer. Three methods of computing the transfer function are outlined in this application. First, the Fast Fourier Transform (FFT) of both the input and the output wave forms are used to compute the transfer functions continuously in real time. Transfer functions have been used for many years to characterize the health of the transformer; however, historically this has been done with the transformer disconnected from the circuit, and using low voltage impulse function testing methods (Doble). The FFT of the impulse response represents the transfer function in the complex frequency domain. Second, the auto-regressive moving average methods to perform this function may be used, and third, a spectral band comparison. And a third "comb" method is also demonstrated as an approximation to the transfer function method.
申请公布号 US2007052426(A1) 申请公布日期 2007.03.08
申请号 US20060495180 申请日期 2006.07.28
申请人 WELLS CHARLES H;BROADWATER ROBERT 发明人 WELLS CHARLES H.;BROADWATER ROBERT
分类号 G01R31/06 主分类号 G01R31/06
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