The surface discharge of silicone rubber (SIR) is one the main reasons to accelerate aging its material in power systems. It known that static water droplets on SIR can make flashover voltage substantially fall, while characteristics impacting are unknown. In this work, dynamic studied. When impact surface, they will stretch first and then shrink. minimum occurs at moment when spreading area dr...

The flashover characteristics of an insulator bridged high voltage vacuum gap can play an important role in the overall performance of a high voltage device, for example in the extreme environments of high energy particle accelerators. The detailed preparation of the insulators is, at present, governed by the commercial production methods and by standard bulk cleaning processes, which for a par...

Sandstorm has an effect on the electric field characteristics of outdoor insulator, and may result in flashover. The analysis of the electric field characteristic of insulator under sandstorm condition is very important. The electrostatic field finite element method (FEM) is used to calculate the electric field distribution along long rod insulator under sandstorm condition with FEM software. T...

Pre-breakdown (leakage) and breakdown currents and photon-emission associated with the currents, under impulse (0.36!10 IJ-S) voltage stress, along high purity (p>30 KQ em) silicon, with and without gold end contacts in vacuum (-lQ-6 Torr), are discussed. Three distinct phases leading to the breakdown condition are observed. These are one-carrier (hole) leakage current, two-carrier (electrons a...

This paper proposes an online early warning technique and the probability distribution function (PDF) based icing image recognition for overhead power transmission lines. The main functionality of the online early warning system for overhead transmission lines firstly suggested in this paper is the early warning of icing, forest fire, lighting, insulator flashover, conductor galloping and invas...

Abstract There is a persistent risk of large-scale fire conflagrations in informal settlements, which can threaten hundreds people simultaneously. Although the literature implies that wind conditions have significant impact on these fires, little known about how affect dynamics and spread flames settlements. In order to comprehend (speed direction) time flashover severity settlement dwellings w...

In the current study, a multi-arc predicting model for DC critical flashover voltage of iced and pre-contaminated long insulator strings under low atmospheric pressure is developed. The model is composed of a series of different polarity surface arcs, icicle-icicle air gap arcs, and residual layer resistance. The calculation method of the residual resistance of the ice layer under DC multi-arc ...