Peculiarity of theoretical distribution law selection by gas-insulated transformers external isolation calculation

Selection of copper against aluminium windings for distribution transformers

Copper and aluminium are the two conductors most commonly used in transformer windings. This study presents a comprehensive comparison of distribution transformers built either with copper or with aluminium windings. The comparison is based on winding material conductivity, density, cost, connectivity, oxidation, machinability and behaviour under short-circuit. Additionally, a parametric analys...

Insulated Power Transformers for Improved PD Detection and Localization

A simple and commonly used way to locate PD in GIS is the measurement in time domain (time-offlight). The time difference between the arrivals of the PD impulse on two UHF sensors is used for localization. The new developed method presented here uses the frequency domain. The basic idea is the displacement law of Fourier transformation. The interference phenomena of superposed signals from two ...

The Rectangularity Law of Transformers by E. L. Peterson

Detection in Spacer of Gas-Insulated Switchgears

With the increasing demand for precise condition monitoring and diagnosis of 11 gas-insulated switchgears (GIS), it has become a challenge to improve the detection sensitivity of 12 partial discharge (PD) induced in the GIS spacer. This paper deals with the elimination of the 13 capacitive component from the phase resolved partial discharge (PRPD) signal generated in GIS 14 spacer based on the ...

Investigation on the Gas-Phase Decomposition of Trichlorfon by GC-MS and Theoretical Calculation

The gas phase pyrolysis of trichlorfon was investigated by the on-line gas chromatography - mass spectrometry (GC-MS) pyrolysis and theoretical calculations. Two reaction channels were proposed in the pyrolytic reaction, by analyzing the detected pyrolytic products in the total ion chromatography, including 2,2,2-trichloroacetaldehyde, dimethyl phosphite, and dichlorvos. Theoretical calculation...