避雷器

Combine with the analysis of the effect that caused by the shielding of topography and the conditions when lightning occurred on the top of the transmission tower, this paper bring forward a synthetical scheme that on the AnNan overhead transmission line, can use long life resistance reducer to reduce the ground resistance of the transmission tower,set up a shielding pull- line on the body of some tower,set up lightning arrester and take unbalance insulated method to improve the level of the line's ability of preventing lightning.

结合地面屏蔽效果分析和雷击杆塔塔顶情况分析，提出了在安南线采用降低杆塔冲击接地电阻、对部分杆塔塔身安装防雷拉线、加装线路避雷器、在双回路共架杆段采用不平衡绝缘配置等措施来提高安南线耐雷水平的综合方案。使用长效降阻剂，降低杆塔的接地电阻，这是提高线路耐雷水平、降低雷击跳闸率的有效措施。

Considering some factors,including the different operation mode and lightning strike location,also calculates and analyzes the infection of the impulse grounding resistance of transmission tower,the lightning arrester s arranging and parameter for protection effect.

采用PSCAD/EMTDC程序计算分析了西北电网兰州东-银川东输变电工程750kV银川东变电站330kV线路雷电侵入波过电压保护，考虑了不同运行方式、不同雷击点的情况，还计算分析了杆塔冲击接地电阻、避雷器的布置及参数对保护效果的影响。

In Gui-Guang DC line Zhaoqing converter station auxiliary power line lightning protection upgrade project,a comprehensive scheme that increases number of composite insulator skirts,adds coupled earth wire and installs line lightning arrester s is adopted.

在贵广直流肇庆换流站站用电源线路防雷改造中，采取了电源线路复合绝缘子加片、增设耦合地线和加装线路避雷器等综合防雷改造方案。

Utilize the principle of wavelength 1/4, when there is high pressure to interfere, the lightning conductor will hold up automatically, The normal work of the system.

利用1/4波长原理，当有高压干扰时，避雷器会自动短路，系统正常工作。

The giant moa was one of the largest of all birds ever known in the world.

巨大的金属氧化物避雷器是一个最大的鸟类已知的世界。

Nevertheless, there were smaller moa birds.

然而，有较小的氧化锌避雷器鸟类。

After parallel connection of capacitors is put in MOA, The electrostatic problem has been transformed into circuit problem.

金属氧化物避雷器以其异常良好的非线性特性在电力系统中获得了广泛的应用。

On-line monitoring the resistive current component of metal oxide arrester timely is very important to the detection of early aging of MOA, but it is very difficult to find the exact resistive current.

金属氧化物避雷器阻性电流分量在线监测对于及时发现MOA的早期老化有着很重要的意义，但是要确切求出阻性电流有一定的困难。

The paper consists of dynamic equivalent of province S network, simulation analysis by simulation software EMTDC, comparison between the simulation result and the graph of fault recorder, applying rotating vector method and resonance theory to analysis fault process, finally having arrived at the fault mechanism of wire-break resonance and asynchronous-ly switching process.

内容包括：对S省电网的动态等值，用仿真软件EMTDC进行仿真分析，将仿真结果和故障录波图做比较，用旋转向量的方法和谐振理论分析事故过程，从而得出了机电相互作用引起变压器中性点击穿和断线谐振导致避雷器爆炸的事故机理。

The sequential network analysis of single phase earth fault is conducted using the symmetrical component method.

部分城市电网主要以电缆作为送电线路，且使用紧凑型的全封闭式的开关设备及氧化锌避雷器，有些城市使用了不少耐压标准较低的电缆。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。