With the rapid developing of national economy, the voltage class of the power system in our country is continuously increased, and the bad influence of the contamination flashover gets more and more serious. Laboratory studies and industrial experience have shown that the variation of insulators leakage current has close relationship with insulators contamination, which provides an integrated ...

On-line PD monitoring of power transformer is presently the research hotspot in the area of high voltage insulation measurement and diagnosis. Due to the weakness of PD signals and bigness of interferences, the extraction of Pd pulses faces many difficulties. The developed techniques, with some achievement, have not met the demand of engineering application yet.The paper proposes an on-line mo...

With extensive application of various electronic circuits and electronic technology in the fields of family, industry, traffic, national defence, Electromagnetic Interference (EMI) has already become the problem that must be considered in the design process of modern electrical engineering. Lightning electromagnetic pulse (LEMP) is so harmful that it has become a very important EMI source. LEM...

With rapid industrial and agricultural development, atmospheric pollution has become more and more severe. With voltage level of electric transmission lines has constantly increasing, the distribution range of power network is becoming wider day by day, and as a result, the possibility of pollution flashover in the power network is becoming higher and higher. According to statistics, the trip...

When the energy deposited in capacitors releases in water through theelectrodes, it brings shock waves, intensely light and heat. This phenomenon is called“electro-liquid effect”. “Electro-liquid effect” is a new subject developed from 1950\\\’s.The essence of “electro-liquid effect” is the fast conversion of electricity to heat, light,pressure and acoustics. “Electro-liqui...

This paper mainly discusses how to design a high stability current control power supply for laser gyro of double anodes and common cathode in North-Finder based on Ring Laser Gyroscope. The characteristic of switching power supply and flyback converter are introduced, and the design of flyback transformer is presented, on this basis, the circuit which generates high-voltage is designed. The ci...

With the development of power system, more and more security, reliability and economyare demanded in current supply. Precise fault location technology is becoming important. It isnot only economizing manual effort but also assuring rapid supply recovery, so it does greatimportance to economic life and politics.The primary content of the paper is research on fault location methods and technolog...

The paper analyses the on-line monitoring power transformer \\\’s chromatogram of oil in the Pingliang 110kV substation and investigation the status in quo of transformer insulation monitor based on chromatogram of transformer oil. After the analysis of deflection sources in routine chromatogram of oil test, the paper brings into effect successfully the equipment on the base of character...

Overvoltage is a critical factor of that influence the security of the power system. It is due necessary to online monitoring overvoltage in power system as obtaining the waveform and characteristic parameters of overvoltage, which is very helpful in anasys accident and improve the insulation cooperation. Most of the existing overvoltage monitoring systems adopt divider to get signal. But for...

In recent years, over-voltage damages of secondary device caused attentions of more and more people. The surge protective devices(SPDs)(such as gas discharge tube、varistor、transient voltage suppression diode)is the simple measures to suppress the surge. However, these methods can’t suppress the high frequency component in the surge. Because the influence of distributed induction and dis...