Because of the appearance of the high temperature superconductor (HTS), the superconducting technology is developing quickly, and the practicability of the superconducting devices is stronger and stronger. However, that brings a very important problem—quench, and the quench protection ensures the safety and stabilization of the superconducting power system effectively. So, the research to t...

Partial discharge(PD)is one of the important reasons causing power transformer insulation degradation and breakdown. It is meaningful to detect and diagnose partial discharge in power transformer. Based on microwave and antenna theory, electrical measurement and electromagnetic theory, the ultra-high frequency(UHF)method used in power transformer for PD detection was studied in this paper.A s...

Since there has no function of dealing with single-phase earth fault in feeder automation by now, we should do some research on this problem. Looking back this problem based on feeder automation, condition and requirement have changed obviously.The scheme for single-phase fault ,which advanced by this paper, absorb the idea of selecting fault line by computer. It combines feeder automation, an...

All kind of aviation tie-in, electrical outlet, electrical magnet, electrical clutch and complicated cable system have been abroad applied in every work of life in civil economy. According to the standard regulation, there have some important significance in detecting and eliminating hitch the insulation and the withstanding voltage capability of product. The paper will introduce a new multi-c...

This Master degree thesis,based on the observing of developing actuality of on-site electrical apparatus monitoring technology,aims at overcoming the problems existing in former on-site monitoring system,such as unable to realize multiple channels sampling and hold,unable to carry out multiple channel programmable magnification,unable to monitor frequency,low pick up bits,external ROM low spee...

Measuring of lightning parameters is the base work of lightning research. It is very important for researching the lightning characteristics, analyzing the accident of lightning, identifying the responsibility of lightning strike outage accident and discussing the strategies of lightning protection. It also can provide precise original data for designing insulation co-ordination. The max light...

It is very effective on overvoltage accident analysis of power grid and improvement of insulation coordination for power system by online monitoring power system overvoltage to obtain waveform and characteristic parameters. Most of the existing monitoring systems for overvoltage adopt voltage divider to get signal based on centralized monitoring. But, because of the divider’s self-deficienc...

AbstractThe application of line arresters with Zine Oxide elements to HV transmission lines could avoid the faults, induced by lightning stroking. This paper investigated transmission line arresters with series air gap by a set of simulating calculation and testing, A Monte Carlo statistical method was used to determine the distribution of lightning stroking on the towers in the transmission l...

With the rapid development of power electronic technology, frequency control technology was used widely. It caused insulation system degradation in advance with some practice virtue. Dupont corona-resistant polyimide films have excellent characteristic of corona resistance and were used widely in conversion system. No one know the synthetic method but Dupont company and corona resistance mecha...

The operation reliability of the power transformer,which is the major equipment in power system,directly related to the safety and stability of whole power system. In accordance with the technological difficulties encountered in the process of insulation supervision based on the Dissolved Gases Analysis (DGA),several kinds of model and method are presented to improve the reliability and precis...