At present, UHV surge arresters have a large number of sections and complex structures. The existing live detection online monitoring technologies can no longer effectively determine the problem deterioration internal resistance arrester. This paper studies structure, power supply, temperature humidity measurement wireless transmission methods measuring probes that be placed in arrester for lon...

The paper considers the possibility of improving technical characteristics gas surge arresters for co-ordination insulation at low voltage, medium voltage and high levels. idea a arrester is based on application radioactive source 241Am in area cathode. Intensive ionization with alpha particles significantly increases number free electrons space between electrodes, which shortens time their tra...

Accurate modeling and parameters identification of Metal Oxide Surge Arrester (MOSA) are very important for arrester allocation, systems reliability and insulation coordination studies. Several models with acceptable accuracy have been proposed to describe this behavior. It should be mentioned that the estimation of nonlinear elements of MOSAs is very important for all models. In this paper, a ...

A study has been made of the fatigue-crack propagation properties of a series of laminated Nbreinforced Nb3Al intermetallic-matrix composites with varying microstructural scale but nominally identical reinforcement volume fraction (20 pct Nb). It was found that resistance to fatigue-crack growth improved with increasing metallic layer thickness (in the range 50 to 250 mm) both in the crack-divi...

Metal oxide surge arresters (ZNO) are used widely in power system to protect equipments from over voltages. Non uniform potential distribution leads to the depressed service life and low safe reliability, so grading ring is applied on HV surge arrester order to uniform the electric field distribution. One of the problems of arresters is leakage current in power frequency that different paramet...

in this paper, intelligent water drop algorithm (iwd) is used to analyze single overhead line connected to grid-grounded arrester. in this approach, at first norton’s equivalent circuit of the overhead line over lossy soil is computed by method of moments (mom) and then for the problem under consideration, a nonlinear equivalent circuit in the frequency domain is proposed. finally applying inte...

Aircraft Arrester Barrier Systems (AABS) are installed at the end of the runway to overcome the runway length on war ships. This system is used for the purpose of stop the combat aircraft due to aborted take-off and emergency landings. The conventional AABS is uncontrolled and highly non-linear system during the operation of aircraft arrestment system. Energy absorbing system is an important pa...

This paper elaborates on several important outstanding issues in the state-of-art of overvoltage protection selection for modern wind farms. The lack of experience with this still-new technology, together with the inherent complexity of wind farm electrical systems, entails several unresolved issues pertinent to the topic of overvoltage protection, particularly in relation to lightning-initiate...

In this paper, genetic algorithm-based approach for transient analysis of single transmission line connected to arrester is proposed. In this approach, the lightning channel striking the overhead line is first represented by a current source and this source is truncated by a finite set of frequency harmonies in time domain. Norton equivalent circuit viewed across arrester is then computed by me...

Abstract When lightning intrudes into the over-voltage in 500 kV substation, wave will be introduced substation along line, which seriously affect insulation level of equipment. In this paper, firstly, working principle, characteristics, and current simulation ZnO arrester are described. Then, electromagnetic transient program (EMTP-ATP) used a GIS carried out research to over-voltage, specific...