Neutral ineffectively grounded modes are widely employed in medium and low voltage distribution networks of China. They can contribute to the reliability of power supply, on the other hand the diminished zero sequence currents caused by them make it hard to detect grounded line. It is an important research subject in neutral ineffectively grounded systems that detecting the ground fault accur...

The development of the center city district and the rapid growth of electricity load bring the medium and high voltage urban grids the opportunity to replace overhead lines with cables, so there must be a new substation style with cable outlets. Because the traditional protection and running modes worked with out regard to the larger and larger proportion of cable outlets, then there may be s...

The flashover of polluted insulators is the one of the key issues to threaten the safe operation of transmission line. Compared with the AC insulators, the contamination deposited on DC insulators is more and the external insulation design of DC transmission lines is more difficult. A mass of investigation of DC pollution flashover has been studied in China and the world, but there is less in...

Gas Insulated Metal Enclosed Transmission Line(GIL)with the merit of large capability,flexible layout,low impact on or of environment,can be used in those situations which the climatic environmental is formidable or the corridor is limited. However,the dielectric strength of SF_6 is extremely sensitive to the nonuniformity of the electric field,and the polarity of DC nonuniform electric field...

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...