Fast and accurately fixing fault points can restore power supply quickly , improve the reliability and safety of the overall power system . it can also reduce the economical loss 快速准确地找到输电线路故障点，不仅有助于及时修复故障线路，确保整个电网的安全稳定运行，减少因输电线路故障带来的经济损失，而且能大量节省巡线的人力和物力。
At the same time , it is significant that the fault point will be found out quickly and accurately not only to the timely circuit repair and the power supply with guarantee , but also to the safety and the economic running of the electrical power system 因此，在小电流接地系统线路发生故障后，迅速准确地找到故障点，不仅对及时修复线路和保证供电，而且对电力系统的安全稳定和经济运行都有着十分重要的意义。
By logging all operations , including bulk operations such as select into , create index , and bulk loading data , the full recovery model lets you recover a database to the point of failure or to an earlier point in time , called a point - in - time restore 通过记录所有操作（包括大容量操作，如select into 、 create index ）和大容量加载数据，可以使用完整恢复模式将数据库恢复到故障点或某个较早的时间点（称为“时点还原
The wavelet tansform " method in this paper is able to automatically and accurately orient to fault points of fiber and provide evidence for automatic analysising to data from inspecting fiber . in view of influence of noise , the choice of threshold will be another question for us 本文提出的小波变换的方法能够自动地、较为准确地对光纤故障点进行定位，为光纤监测数据的自动分析提供了依据，考虑到噪声的影响，阀值的选择将是我们进一步研究的问题。
Electrical power system fault calculation is an important reference of electric equipment choice , electric network design choice and relaying protection setting calculation . now the highvoltage network is very complicated , its mode of operation is multivariant . it is difficult to deal with handwork 现今的高压电网，结构复杂，运行方式变化繁多，需要计算的故障点多，采用传统的手工方法计算困难极大，既不符合实际，也不能满足快速精确计算的要求。
This article in detail elaborates supply power and breakdown type and the test methed , how to scientifically grasp the different breakdown electric cable meter test profile analysis as well as the breakdown localization method , and introduces how to solve the problems appeared in the scene test 摘要介绍了供用电企业中电缆的各种故障类型和故障测试方法，对不同故障电缆仪测试的波形进行了分析，阐述了电缆故障点的定位和现场测试中通过波形判断故障的方法。
The accurate fault location of the fault position of high voltage transmission line is principal measure for improving safety and economic performance of the power restoration of line , cut down economic loss due to the failure , which has great social and economic interests <中文摘要> =高压输电线路故障点的准确定位是提高电网安全经济运行的主要措施，准确的故障定位可以减轻巡线负担，加快线路恢复供电，减小因停电而造成的经济损失，具有巨大的社会和经济效益。
A tentative idea of using the variation of interim resistance to achieve the metering ofadapting oneself to impedance is put forward , the relevant bases of a differentiation are derived , and its preliminary analysis has been carried out as well . it aims at eliminating the influence of interim resistance on metering of impedance protector by changeable property of arc resistance 提出了利用过渡电阻增量实现阻抗自适应测量的设想，导出了其动作判据，并对该判据进行了初步分析，旨在利用故障点电弧电阻的变化特性来消除过渡电阻对距离保护正确测量的影响。
The main job of this research is : ( 1 ) analyze the operation situation of power system during faults ; pay attention to the traveling wave on the three - phase transmission line ; study the equation of voltage on three - phase transmission line with impedance capacitance coupling between phases ; contact the voltage on any point with the fault voltage , study the singularity of the voltage signal in fault point , and make it to be the base of the new fault detection method ; ( 2 ) apply the singularity detection theory based on wavelet analysis to the power system faults detection , give a complementary criterion to current fault detection criterion , study how to select the basic wavelet , how to filter noise , how to detect the singular point or fault point , and finally give a total solution . the simulations prove it to be a quick , correct and effective fault detection method 本文的主要工作有： ( 1 )分析电力系统在发生故障时的运行状态，尤其对三相传输线上的故障行波进行了分析和研究，推导了考虑相间耦合的三相传输线电压方程，并将传输线上任一点的电压与故障点电压建立起联系，得出了传输线上电压信号在故障点处的奇异性，并以此作为构造新的故障检测算法的理论基础； ( 2 )将基于小波变换的信号奇异性检测理论运用于电力系统故障检测中，针对目前相关研究的不足，提出了电力系统故障检测判据的补充判据，通过对基本小波的选择、除噪措施、信号奇异点也即故障点的检测方法所作的分析，给出了一个可行的解决方案；仿真研究表明：这是一个快速、准确、有效的故障检测算法。
Based on the investigation of analysis methods for the overvoltage striking on rotating electric machines and its research status at home and abroad , the safety forecast theory and the analysis method for the switching overvoltage of large power stations are firstly presented based on the field - circuit analysis , and the transient field distribution and the insulation condition in the stator winding insulator stricken by the switching overvoltage in large power stations are studied and analyzed on line 本文在分析和总结国内外关于旋转电机过电压分析方法及其研究现状的基础上，首次提出了基于场路结合的厂站操作过电压安全预测理论和分析方法。本文研究了大型电站中的操作过电压冲击波在发电机定子绕组绝缘介质中暂态电场的实时分布状态，在线分析发电机的绝缘工作状况，搜索发电机内部可能突发绝缘事故的区域，预测发电机内部可能发生绝缘事故的故障点，并重点研究了大型发电机绝缘安全在线预测分析方法和建立了大型发电机绝缘安全评估模型。
