Cellulosic paper and oil insulation in a transformer degrade at higher operating temperatures. Degradation is accelerated in the presence of oxygen and moisture. Power transformers being expensive items need to be carefully monitored throughout its operation. Well established time-based maintenance and conservative replacement planning is not feasible in a current market driven electricity indu...

The work presented has been carried out to obtain a better insight into electrical aging phenomena of mica insulation as used in high voltage rotating machines. Model bars with typical insulating materials were exposed to standard electrical aging and stimulated tree propagation at a new electrode arrangement. The results show that time to breakdown under electrical load is mainly determined by...

This paper presents the effect of natural aging upon the performance of the polymeric insulat ion materials made from Epoxy resins, Polydimethylsiloxane (PDMS), and Rice husk ash compound. The sa mples of epoxy resin insulation material consist of Dig lycidyl Ether of Bisphenol A (DGEBA), Meta Phenylene Diamine (MPDA) as curing agent, and 325 mesh Rice Husk Ash (RHA) as filler, treated with var...

Defective cables in the electric power systems of nuclear power plants can cause failure of essential components in control and instrumentation or power distribution subsystems, resulting in potential safety concerns. Due to this problem, a nondestructive and non-intrusive condition assessment technique is highly desirable to evaluate cable status and to predict the remaining useful life of a c...

The accurate estimation of the thermal performance of insulation products used in buildings over their expected lifetime has been a recognized challenge for over 25 years. This is because the lifetime of such products is long, thermal aging is caused by the diffusion of a multitude of gases, and the insulation product is not homogeneous. The task of developing a standard test method for predict...

Measurement errors of a capacitive voltage transformer (CVT) are relevant to its equivalent parameters for which its capacitive divider contributes the most. In daily operation, dielectric aging, moisture, dielectric breakdown, etc., it will exert mixing effects on a capacitive divider’s insulation characteristics, leading to fluctuation in equivalent parameters which result in the measurement ...

Partial discharge (PD) inside cavities causes aging of a stator bar groundwall insulation system that can generates breakdown leading to equipment failures. One the conditions PD occurrence is electric field (EF) within cavity must exceed an inception mainly depends on size and pressure. A model has been simulated using Finite Element Method (FEM) in order study presence spherical insulation. S...

In order to further study the effect of different degree acidity and alkalinity on cable insulation aging, aging condition was compared analyzed under pH values. The samples material slice short were carried out accelerated test, which placed in conditions And then test results micro morphology electrical properties between after aging. According this paper, would change differently alkalinity,...