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The investigations of synchronization between the signals are commonly used methodology to assess the condition of transformer insulation during lightning impulse test. Hence, a synchronization measure has so to be defined properly for several non stationary signals through appropriate formulation by using any signal processing, statistical and mathematical analysis. In this paper, the principles...
Identification of partial discharge (PD) is an important diagnostic tool for reliable decision of transformer during impulse test. Since, transformer is not accessible directly to investigate the pass or fail criteria of the transformer due to PD or any other major faults. Only the measured high frequency nature of current signals (winding responses) due to different impulse test sequences can help...
This paper derives and analyzes the asymptotic performances of the maximum-likelihood (ML) estimator and the generalized likelihood ratio test (GLRT) derived under the assumption of independent identically distribution (i.i.d.) samples, where in the actual model the signal samples are m-dependent. The ML and GLRT under such a modeling mismatch are based on the marginal likelihood function, and they...
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