Small hydroelectric power plant and wind farm are typical forms of Distributed Generation (DG), have developed rapidly in the recent years. With the increasing penetration of DG, the topology configuration of distributed networks (DN) is changed, as well as the distribution of fault current and voltage. More than one generator directly connects to a common bus in a small hydroelectric power p...

In order to improve the reliability of the High Voltage Direct Current Transmission (HVDC) system and select basic lightning impulse insulation level and switch impulse insulation level of equipment in converters station properly, the overvoltages of HVDC system must be studied in detail. In this thesis, the Gezhouba-Nanqiao HVDC system is simulated and two types of overvoltage in the transmi...

The measurement precision of dielectric loss angle is a key factor of the performance of on-line monitoring system of metal-oxide arresters. The causes of data error of on-line insulating monitoring system for MOA are introduced in the paper. Questions about harmonic interference and surface contamination in on-line monitoring insulation system of MOA are stated, this paper will research on ho...

The testing instrumentation is a kind of effective tool for testing the dielectric oil broken-down voltage in power field. With the high-speed development of electronic technology, single chip is more and more widely used in modem intelligent instrumentation and meter. In this article, the designing method of an instrumentation based on …

The fault locating is an important function of the distribution automation system, and the single phase grounding fault happens frequently in the distribution network, so study on the method of single phase grounding fault locating plays an important role in reducing the range of outage, shortening the time of outage, and supplying level of power bureau.A new method about fault section locatin...

Thunder and lightning is a kind of weather phenomenon which occur in atmosphere. It have the big instantaneous current, high voltage, strong electromagnetism radiate, because of the particularity of the thunder and lightning happened and the development process, usually cause serious disaster which is listed as \” one of the most serious ten kinds of natural disasters\” by the con...

With the rapid development of the electric power industry, more and more SF_6 electrical equipments are used. The quality monitoring of SF_6 gas is more important than before. SF_6 gas in the electrical equipment is inevitable to mix other gases. Under the arc action, the impurity can easily react with the decomposed product of SF_6, and then produce poison which can corrupt electric equipmen...

GIS is one of the important equipment of power system, its main trouble is inside insulating degradation. The measurement of the partial discharged signal offered important information for insulating whole situation within GIS. The partial discharges monitoring system divided into the measurement of the PD signal、the suppression of external disturbance、atlas analyse、extract eigencector ...

This paper points out the necessity of carrying out researches into electrified oil-charge in current power system, discusses in detail the technical demand of electrified oil-charge about various sealed-structure electrical equipment, the design of electrified oil-charge device and the practice in all kinds of electrical equipment on the spot.In accordance with the requirements of electric po...

Operation over-voltage and power frequency over-voltage are the main reasons that cause the damage of high voltage equipment in power network. They bring with natural operation course or broken-down course. If we do not analysis~ calculate this type of over-voltage earnestly, then take corresponding protection measures, especially for the equipment of 500kV volt...