This paper proposes an equivalent circuit model to obtain the transient electrical stress quantitatively in medium voltage frequency transformers modern power electronics. To verify this model, simulation is performed on a 1.5 kV/1 kHz transformer, revealing overshoot between turns and layers of transformer’s HV winding. Effects rise time input pulse voltage, stray capacitance winding insulatio...

The measurement of oil-paper insulation systems in the frequency domain provides novel diagnostic methods for quality control of materials and highvoltage power transformers. The first task is to measure and to analyse the dielectric behaviour of oil-paper insulation systems and their dependency on material quality, moisture content and ageing products in oil, paper and pressboard. Furthermore,...

Identification and location of partial discharge (PD) source is an important diagnostic tool for reliable operation of transformer. In this paper, future template numerical interpretation techniques are proposed for location of PD pulse duration from 0.1 s to 5 s in transformer windings using sweep frequency response analysis (SFRA) principle. To analyze the efficacy of the proposed techniques ...

Photovoltaic(PV) systems are expected to play an important role in future energy production. An asymmetrical interleaved high step-up converter is used to get high step up gain to step up the input energy which is obtained from PV panel without operating at an extreme duty ratio. The traditional inverter which is used to convert the converter output energy from DC to AC, contains a line frequen...

This paper proposed a new wavelet based method to identify inrush currents and to distinguish it from power system faults. The proposed algorithm extracts fault and inrush generated transient signals using DWT. Transient current signals at both sides of a transformer are firstly captured. The wavelet transform is a relatively new and powerful tool in the analysis of power transformer transient ...

Well known reasons for local failures in power transformers are caused by partial discharges (PD) in the electric insulation. Continuous deterioration over time increases the defect which finally can lead to a breakdown of the entire insulation. The importance of PD measurement is accommodated by standardized electrical measurement according to IEC 60270 [1] which is required for acceptance cer...