特高压直流保护与避雷器动作特性配合分析  

Coordination of UHVDC Protection with Arresters' Operating Characteristics

作　　者：黎建平[1] 汪凤娇[2] 卢文浩[1] 陈伟[1] 龙启[1] 王钢[2] 

机构地区：[1]中国南方电网超高压输电公司检修试验中心,广州市510663 [2]华南理工大学电力学院,广州市510640

出　　处：《电力建设》2014年第12期100-105,共6页Electric Power Construction

摘　　要：随着电压等级升高,特高压直流输电工程的过电压水平也明显增大,而直流控制保护整定和避雷器参数配置又都是从各自的角度出发进行选择的,因此,十分有必要对控制保护与避雷器动作特性的配合进行研究。用于特高压直流换流站绝缘配合研究的控制策略往往采用国际大电网会议(international council on large electric systems,CIGRE)推荐的简化控制策略,基于简化控制策略的保护动作时序和实际有一定差异,会对过电压和避雷器的仿真结果有较大影响。基于云广特高压直流输电工程实际控制保护策略,通过理论分析和仿真研究了交流侧相间冲击、最高YY换流变阀侧接地和金属回线开路3种典型过电压工况,对比了云广特高压工程实际控制保护不同的时延对避雷器动作特性的影响。在这3种工况下,云广特高压工程实际控制保护策略与避雷器配合满足运行要求,保护时延还有一定的可调节裕度,可供其他直流工程参考借鉴。With the increase of voltage grade,the overvoltage levels of UHVDC transmission engineering also increase significantly. The setting of DC control protection and the parameter configuration of arrester are selected from the perspective of their ow n choice,so it is needed to study the coordination of control protection w ith arresters＇ operating characteristics. The control strategy used for the insulation coordination research on UHVDC convertor station is often simplified control strategy recommended by CIGRE（ international council on large electric systems）. The protection timing based on the simplified control strategy also has a certain difference from the practice,w hich may lead to a great influence on the simulation results of overvoltage and arrester. Based on the practical control protection strategy in Yun-Guang UHVDC transmission engineering,through theory analysis and simulation,this paper studied three typical over-voltage conditions：AC-side phase-phase sw itching impulse,the flashover of Y w inding bushing at HV valve side of converter transformer and metal loop open-circuit,as w ell as compared the the influence of different delay of Yun-Guang actual control protection on the operating characteristics of arresters. In these three conditions,the coordination of Yun-Guang actual control protection strategy w ith arresters can meet the operation requirements; there is still a adjustable margin in protection delay,w hich can provide a reference for other DC projects.

关 键 词：特高压直流 控制保护 氧化锌避雷器 操作过电压 

分 类 号：TM85[电气工程—高电压与绝缘技术]