±500kV换流站吊车施工安全距离研究

Study on Safe Distance for Crane Operation in ±500 kV Converter Station

现有规程对±500 kV换流站内大型机具使用的安全距离均未做规定,而实际工作中经常需要在换流站内使用吊车、叉车等特种机具。为保证在换流站内使用吊车进行工作时的安全性,通过对母线,直流滤波器,套管,支柱绝缘子等典型设备电场状态的分析,选定最具代表性的设备表面为典型电极,模拟电极开展大量交、直流混合加压试验。实验应用了最严酷的试验条件,即在进行直流叠加操作冲击的复合电压放电特性试验时,对模拟作业间隙施加正极性直流电压叠加正极性操作冲击。在使用统计分析工具对试验数据进行分析的基础上得出每种情况下的最小安全作业间隙,进而推导出吊车在换流站施工的安全距离标准。

The existing specifications have not provided the safe distance of cranes which are frequently used at ±500 kV HVDC converter stations.To ensure the security while using the crane,the paper analyzes the electric field status of bus line,DC filter,bushing,and post insulator and select their representative surface as the typical test electrodes to carry out AC/DC hybrid high voltage test.The most severe test condition is applied on the test,namely,while carrying out the composite voltage discharge characteristics test（DC voltage plus operational impact）,a positive operational impact is superimposed on a positive polarity DC voltage at the operation gap.Based on the test data,statistical analysis tools provides the minimum gap of safe operation,and the standard of safe distance of crane work at ±500 kV HVDC converter station is derived.