摘要
介绍了国内线路防雷的主要措施和运行情况,指出线路型无间隙避雷器主要悬挂于线路两端及进出变电站的第一个塔上,用于提高整条线路的绝缘水平;也安装在进出变电站的第一个杆塔,减少入侵雷的幅值。线路型带串联间隙避雷器主要悬挂于雷击多发区的输电杆塔上,保护线路绝缘子串免受雷电过电压引起的雷击闪络。检测主要采用泄漏电流监测、红外测温及紫外成像等方法;测量无间隙避雷器交流泄漏电流即全电流分量及其阻性分量,是带电测试线路型无间隙避雷器的主要方法。在条件允许的情况下,还应结合红外测温、紫外成像方法对避雷器进行监测,并做出正确的评价。对线路型带串联间隙的避雷器加装故障指示器为可能出现故障的避雷器提供标示,但应结合停电试验结果对避雷器的质量状况做出正确的评价。使用线路避雷器时应注意准确地选择保护范围、安装点及日常维护。
The main measure of lightning protection for over head line within China and their operation were described. The line gapless arresters are usually hanged at both line ends and on first tower form both inlet and outlet of substation for reducing amplitude of incoming lightning and enhancing the insulation level of transmission line as a whole. The gapped line arrester are to be installed on towers of transmission lines in thunderous regions for protecting insulator strings against lightning flashover, where new type fault indicator is set as well. The monitoring methods comprise leakage current measuring, infra-red thermometering and UV imaging, from which the a. c leakage current and its resistive component measuring being basic monitoring method. The infra-red thermometering and UV imaging can also be used for proper evaluation of the MOA performance as available. For gapped line arrester, an attachment of fault indicating. But the correct evaluation of MOA quality statue can be made only at de-energized inspection. Care shall be taken to correct select the protection zone and installation spots and carry out proper installation and service maintenance.
出处
《电瓷避雷器》
CAS
2006年第4期30-33,共4页
Insulators and Surge Arresters
关键词
线路避雷器
雷击跳闸率
泄漏电流
绝缘子串
故障指示器
line arresters
lightning trip-out rate
leakage current
insulator string
fault indicator
