With distribution network extending and increasing of apply more cable,the system capacitance current is increasing. Neutral earthing via arcextinguishing coil system is preferable to make sure to put out arc insingle-phase earthing fault. The paper introduces a new arc extinguishingcoil—dual adjustable auto compensable arc extinguishing coil which bases onanalyzing kinds of arc extinguishin...

Fault selection for the non-effective-earthed system is a long-standing problem inthe operation of ineffectively grounded distribution systems. But the spot records showthat the effect is disappointing by some factors of disturbance. The paper research theeffect of three-phase unbalance by unbalance of earthed capacitor, Analyze how toeffect fault selection and propose a method to resolve this...

For a long time , It is troublesome when it comes to single-phase-grounded fault happened in system with non-effectively earthed neutral. Because the fault single is weak and is easy to receive influence of disturbance, and because the variability of fault condition and movement way, some methods already proposed and obtained the application all exist the certain flaw, they are unable to adap...

The systematical reaseach for grounding of Imboulou hydropower station is done by using numerical value analysis method. It deducts several important formula based on boundary method and built applied calculation model for Imboulou hydropower station grounding. Then the method of face to object is adopted and program grounding calculation of Imboulou hydropower station is complied under the c...

Partial discharge (PD) is one of the most important reasons causing high voltage electric equipment insulation degradation and breakdown, and the insulation states of equipments affect their safe and stable run in power system directly. So PD research is very important in electric power engineering. Deeply research on the nonlinear dynamic characters of PD signals can make us know PD phenomen...

Emulsion is a comparatively stable multiphase dispersive system which is composed of several liquids. In this system, one or several liquids disperse into another insoluble liquid. There are two kinds of emulsion: water-in-oil (W/O) and oil-in-water (O/W).As the development of petroleum and chemical industry, more and more emulsion needs to be broken down. Currently the applied methods of dem...

The endurance function of the insulation field is widely concerned in the power system. According to the equality between the two dimensional Weibull distribution and the Law of electrical aging, after the method for estimation of the voltage endurance coefficient is presented by the maximum likelihood estimation and the minimum square estimation of the two dimensional Weibull distribution par...

In the substation of Mianyang, a majority of 35kV lines power the military plants for scientific research or manufacture. For the line corridor was a mountainous area with complex landform and high soil resistivity, the line lightning protection measure was weak. And for history reasons some 35kV lines were not all spanned with lightning conductor. The operation data in recent years reveals th...

In power system, neutral low current grounded system\\\’ s line-selection protection devices are deficient in the speed of response and the accuracy of selection. A high-speed thirty-two channels data acquisition and processing system is made of TI\\\’ s DSP TMS320F206 and two piece of MAXIM\\\’ s 2×4-channel simultaneous sampling 14-bit DAS MAX125. In addition, a Philip\\\&...

Low sensitivity and low reliability in the relays of single-phase-to-earth fault line selection\\\’s device are always the problems in ungrounded neutral system. Through reviewing of the existing theories on fault line selection systematically, this paper points out the defects and drawbacks of those. It points out the single-phase-to-earth fault line selection project that turning on an...