The condition of the internal cellulosic paper and oil insulation are of concern for the
performance of power transformers. Over the years, a number of methods have been …

The motivation to improve components in electric power equipment brings new proposals
from world-renowned scientists to strengthen them in operation. An essential part of every …

Oil-immersed transformer is one of the most important electrical equipment in power
distribution and transmission systems. Dielectric response method is a well-recognized …

The paper investigated the influence of temperature on the frequency dependence of the
conductivity of cellulose-ester insulation of power transformers containing nano-drops of …

The traction transformer of a high-speed railway is long-term subjected to the effects of
impulse traction loads, such that the aging status of a multilayer insulation paper between …

Dielectric response analysis is one approach for the condition assessment of high voltage
insulation systems, and measurement of the dissipation factor or tan δ is widely used in …

Online insulation monitoring techniques for power transformers have been widely studied.
However, challenges rise when they are applied to the converter-connected transformers …

Dielectric response testing is a non-destructive insulation testing method that is widely used
for assessing insulation properties. Time-and frequency-domain dielectric spectra are …

The paper presents a model of hopping conductivity at direct and alternating current,
developed on the basis of the quantum phenomenon of electron tunnelling between …

Traction transformer is vital equipment in high-speed railway. Insulation status decides its
safety and reliability, and the frequency-domain dielectric spectrum (FDS) test is one of the …