Oil-immersed power transformer is the core and key position of electrical transmission and distribution, and the most important and vital part of electrical net as well. Mastering its condition of insulation accurately and avoiding any problems resulting in the break of electrical transmission, even serious accidents such as large area power cut is very meaningful. At present, there are lots ...

The safe operation of transformer substation is important safeguard for safe and reliable movement of the electrical power system, but the grounding grid conductor buried in underground, the performance often goes badly because of year by year corrosion of the soil. It threatens the safe operation of the electrical power system、the safe of the staff and the electrical equipment. If discover...

Direct current system is an important working power source for power plants and substations, it supplies reliable, uninterruptible power supply to secondary equipments, affecting its normal work and operation. Circuit branch grounding is the most common faults in DC system, how to detect it effectively is a main issue for DC system’s safety operation. So, it’s of great significance to stu...

Lightning is the main reason that causing lightning accident to transmission line. Since there is high frequency thunderstorm in Qinghai-Tibet plateau, and thundercloud is lower relatively, transmission line in this zone is easier to be stroke than in plain. To keep the Qinghai-Tibet Railway safe, it is important and necessary to start this research on improving lightning withstand level of 1...

In GIS, an insulator surface is the weakest part of a solid-gas insulation system. Knowledge of the insulating properties of solid insulator surfaces and the influence of their profile is thus very important. A major factor that influences the dielectric strength is the charge deposited on the surface of the solid insulation. These surface charges accumulated on the surface of dielectric may ...

When single phase to earth fault occurs on a neutral non-direct grounded power system, it is necessary to select the fault circuit quickly. But, from existing status of this field, it has not been done very well. This paper introduces a novel fault circuit selecting method, which utilizes wavelets transform to obtain useful fault transient components.Firstly, A detailed analysis to fault trans...

Transmission lines which take charge in transporting electrical energy take on the important role in power system. The exact fault location will reduce the manual work and find out unclear faults. Resuming transport in time and credible power supplying would be available to stabilization and economical operation of power system. The exact fault location would bring large economic and social pr...

The article introduced the problem of while medium voltage and low voltage power-supply network line-to-ground at the Business enterprise of the BaoTou Iron

Based on analyzing the development of on-line monitoring partial discharge technology in power transformers and cooperated with the current sensor, DSP and the communication interface card of CAN, this paper used the graphical programming language LabVIEW to develop an on-line monitoring partial discharge system based on the virtual instruments. The system used a high-speed data acquisition un...

In our country, lots of neutral ground method are used in the 6～35kV distribution grids. Of these methods, resonance ground technique is used mostly. But, there are also some problems which have not been settled in the resonance ground system. By a lot of analyses for the medium-voltage distribution networks with different neutral ground techniques, the disadvantages of neutral resonance gro...