One of the most evident phenomena found for ice accretion on energized insulator is the frequent presence of an air gap near the HV terminal. The existence of air gaps will inevitably distort strongly electrical field distribution and cause to a significant voltage drop across the gap, which causes severely non-uniform electrical field near the icicle top. Electrical field stress at the icicle...

With the rapid development of electric power enterprise, the demand on the reliability of electric power system is further more, and the development of on-line insulation monitoring technique has been paid more attention. Oil-filled equipment plays a very important role in power system, and the dielectric loss factor (tgd) is an important parameter to reflect the insulation condition. Therefor...

Based on the anaysis of the actual on-line monitoring technology for MOA, thispaper used many experiments to analyze the variation of characteristic parameters underdifferent stresses, and with the help of results from the field, we got the effective methodto distinguish the different incidents. Simulated the influences to on-line monitoringresults of MOA by the factors such as voltage fluctua...

As a large amount of surge protective devices (SPD) are being used in our daily life, the test of SPD energy endurance becomes more and more important. So the impulse current generator is seriously needed. The impulse current generator which can generate high impulse current is used in the test of electromagnetism compatibility and resistant-sustainable ability of electric implement fulminous...

The higher safety and reliability of the traction power system are absolutely required for the rapid development of High-speed Railway and Heavy-duty Rail Transport. The polyimide film is the main material of the traction motors\\\’ insulation, which bears the pulse voltage with high volt and rapid rising edge and large repetition rate. In this paper, the chief topic is talking about th...

About half of accident and obstacles in the electricity transmission and distribution system dues to lightning caused. With the increase of transmission lines voltage level and large-scale inter-provincial and trans-regional power transmission lines in operation, lightning trip has been the main reason of transmission line, in particular the mountainous transmission lines. The damage caused b...

Recently, the research of vegetable insulating oil has become a pop project at home and abroad. Flash point of vegetable insulating oil is higher than 300℃, so it is a fire resistant oil. It will not pollute the water and inhabited area, whose biodegradable percent is larger than 97%. The output and quality of oil corps are improved by using gene techniques, and the reserves of mineral oil ...

As the main insulation used in oil-immersed transformer, Oil-paper suffers from thermal and electrical aging in the long-term running, which deteriorate the insulating performance and threaten the reliability of transformer directly. Aging research work is of vital importance in insulation subject, which contributes to the insulation diagnosis and lifetime prediction. Especially, with the appl...

With the increament of generator capacity, the requirement of stator single earth-fault protection is becoming more and more high for generator. The injection stator earth-fault ground protection are a widely application foreground because of its predominant highlighted. The first, this paper analyzes the characteristic of 20Hz injection protection in the protective device of SIEMENS and prop...

The lightning inrush overvoltage is the main reason for lightning accident of substations and power plants. So how to compute and simulate the lightning inrush overvoltage of substations and power plants has important significance: the lightning protection performance of substations and power plants can be valued by the compute result, and chose credible and economical lightning protection met...