特高压

The work of this dissertation hopes to provide some useful reference for the construction of UHV transmission projects, hopes to provide a more effective theoretical basis for the design of aeolian vibration control and subspan oscillation control, and hopes to lay the foundation for a more in depth study of this subject in the future.

希望本文的研究能够为特高压输电工程的建设提供一些有益参考，为输电线的微风振动控制设计及次档距振荡控制设计提供更为有效的理论依据，为以后更深入的研究打下一点基础。

By means of simulation, the authors research the over-voltage level at AC and DC sides of converter station as well as arrestor operation condition caused by last breaker trip occurred in inverter station of UHVDC power transmission project from Yunnan to Guangdong; analyze and reveal the interrelations among over-voltage level, various operation conditions and different action delay of DC protections and propose the requirement to the time of protection coordination to ensure secure and reliable operation of equipments for the project.

文章对云广特高压直流系统逆变站最后断路器跳闸引起的换流站交直流侧过电压水平以及避雷器工况进行仿真研究，分析揭示不同运行工况、不同直流保护动作延时与过电压水平的相互关系，提出对保护配合时间的要求，以确保系统设备能安全可靠运行。

The configuration scheme of lightning arrestor protection for converter station, the principle of insulation coordination and overvoltage protection strategy for converter station are analyzed; the parameters and characteristic of lightning arresters are calculated; after analyzing the overvoltage protection for equipments and insulation level of equipments in detail, the discharge voltage of air clearances in converter station is given preliminarily.

自2005年国家电网公司部署建设±800kV直流特高压输电工程以来，组织国内外直流专业公司、科研院所、设计单位开展了广泛的研究工作[1-5]。从主接线方案的比较、户内外直流开关场的选择到绝缘裕度的确定，都从绝缘配合设计的角度进行了研究和比较，取得了大量研究成果[6-11]。

For UHV autotransformer, its voltage regulating method is special because of its voltage is so high.

特高压变压器在考虑体积、造价及可靠性的情况下，采用单相自耦变压器成为必然。

In this paper the impacting extent of equivalent inductances of transmission lines and transformers as well as that of high voltage shunt reactor on GIC level evaluation by DC equivalent model of power network are analyzed, and by means of simulation the impacts of transformer winding connection modes and structure of transformer cores on equivalent inductance of transformer are researched.

文章分析了线路等效电感、变压器等效电感和高压并联电抗器等效电感对采用电网直流等效模型评估GIC水平所产生误差的影响程度，通过仿真计算分析了变压器绕组联结组别和变压器铁心结构对变压器等效电感的影响，最后针对我国电网的特点，提出了用于评估超、特高压电网电磁感应电流水平的电网等效模型。

Generally, the use priority is given to rectangular groove, and triangle groove is used under ultra-high pressure and ultra-high vacuum.

一般情况下优先使用矩形槽，只有在特高压、特高真空的情况下才使用三角槽。

The background of protective relaying based on travelling wave for transmission lines is introduced and its development at home and aboard is reviewed.

0引言全国高压、超高压输电线路的不断扩建及特高压线路的试建，大容量机组的陆续投运，全国电网的互联对电力系统继电保护的动作速度、可靠性、灵敏度等指标提出了更高的要求。

Therefore, the study on the 800kV AC disconnector suitable for high altitude area becomes very important in high voltage power field, and has great value for engineering application.

因此，研制适用于高海拔地区的800kV特高压交流隔离开关是高压电力领域的一个重要课题，具有重大工程应用价值。

Impact of an operating voltage on impulse over-voltage strength in the transformer is analyzed. Necessity of the operating voltage defined by the test voltage of the lightning impulse for UHV power transformers is pointed out. Through researches the maximum permissible operating voltage for the main isolation of UHV transformers is obtained.

分析了变压器的工作电压对冲击电压强度的影响；指出了雷电冲击试验电压定义下的工作电压对于特高压变压器的必要性；通过研究得出了特高压变压器的主绝缘的最大许用工作电压。

In order to develop an excellent performance UHV arrester,the author have studied the existence of limits of the practical requirements of ZnO varistor voltage gradient,and combining with the practical application demand of the UHV arrester,discussed the ZnO varistor voltage gradient limits related issues in detail.

为了研制性能优异的特高压避雷器，笔者对实际所需ZnO压敏电阻的电压梯度是否存在限值进行了研究，并结合特高压避雷器的实际应用需求，详细讨论了ZnO压敏电阻的电压梯度限值的相关问题。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。