摘要
文中通过计算和试验对实际发生的典型500 kV双回路直线转角塔雷击故障进行详细分析。对故障塔结构及绝缘配置参数进行调研分析,推导避雷线保护角、绝缘子坐标与绝缘子偏角之间的关系,建立雷电绕击计算模型并计算验证故障塔跳闸原因为雷电绕击故障杆塔转角内侧中相,结合实际地闪密度开展雷击跳闸风险评估;同时根据故障塔实际尺寸开展直线转角塔雷电绕击模拟试验,模拟比例为35:1,统计不同相导线绕击次数和放电路径;总结得出直线转偏角对雷击跳闸率及风险等级的变化规律,提出在转角内侧中相加装线路避雷器、开展绝缘子偏角校核等运维改造建议。
Calculation and test were conducted to analyze typical lightning failure of 500 kV double-circuit straight angle tower. The structure and insulation parameters of a struck tower were analyzed to derive the relationship of insulator declination angle with lightning protection angle and insulator＇s coordinates, and a computational model of shielding failure was built. Calculation with the model proved that the tripping of the tower was due to lightning strike on the middle phase in the inside corner of the tower. Actual lightning ground flash density was considered in the risk assessment of lightning trip. Furthermore, a test platform was built to carry out the test of shielding failure of the double-circuit straight angle tower with a simulation proportion of 1：35 of the actual tower size, and the numbers of shielding failures and discharge paths on different phase conductors were obtained. Hence, the variations of lightning trip rate and risk level with insulator declination angle were summarized. It is suggested that lightning arrester be installed on the middle phase of the inside corner and the insulator declination angle be calibrated.
出处
《高压电器》
CAS
CSCD
北大核心
2016年第9期179-183,189,共6页
High Voltage Apparatus
基金
国家自然科学基金项目(51407026)~~
关键词
直线转角塔
模拟试验
故障分析
绕击
straight angle tower
simulation test
failure analysis
shielding failure
