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In order to improve the accuracy of on-line application and winding condition assessment of pulse frequency response method, this paper proposes a short time Fourier transform (STFT) algorithm to construct the pulse frequency response curve of the transformer windings, trying to solve the problem of the fast Fourier transform, (FFT) algorithm is not suitable for dealing with transient signal. PSPICE...
To calculate the very fast transient overvoltages in transformer windings, a model based on the modified multi-conductor transmission line (MTL) theory is proposed in this paper. In original MTL model, the lengths of all the conductors are considered to be equal and this approximation can cause inaccuracy. In fact, the lengths of the conductors are decreasing from the outside to the interior. This...
To calculate the very fast transient overvoltages in transformer windings, a novel model based on the modified multi-conductor transmission line (MTL) theory is proposed in this paper. In original MTL model, the lengths of all the conductors are considered to be equal and this approximation can cause inaccuracy. In fact, the lengths of the conductors are decreasing from the outside to the interior...
This paper is concerned with the phenomena of very fast transient overvoltages (VFTO) invading the transformer windings. Some literatures have pointed out that the insulation breakdown usually locates near the entrance of the windings. So it is very important to study the voltage distribution along the coils near the entrance of the windings under VFTO. A new hybrid model is presented to simulate...
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