带电作业安全距离和工器具绝缘长度的海拔修正方法探讨

Discussion on Altitude Correction Method for Safety Distance of Live Working and Insulation Length of Tool and Equipment

海拔越高,空气越稀薄,放电越容易,放电电压越低(指海拔4000m以下),为弥补放电电压的降低,在高海拔地区工作的电气设备的绝缘强度,包括带电作业的安全距离和工器具的有效绝缘长度都要加以修正。《广西电力》2012年第6期刊登了作者吴永明的文章《高压架空线路操作问隙海拔修正方法探讨》,给出的3种修正方法很好,但由于带电作业的特殊性,现场修正、计算比较困难,文章介绍一种简单、实用的修正方法供参考。该修正方法现场操作简便、易学,具有实际意义。

The higher the ahitude and the thinner the air,the easer the discharging and the lower the discharging voltage （below the altitude of 4 000 m）. In order to compensate the reduction of discharging voltage, the insulation strength of electrical device at high altitude area, including the safety distance of live working and the effective insulation length of tool and equipment need to be corrected. Three correction methods are proposed by the author WU Deng-ming in the article ＂Discussion on Altitude Correction Method of Operation Gap in High Voltage Overhead Transmission Line＂ published on No.6,2012, ＂Guangxi Electric Power＂, which is perfect but is difficult to field correction and calculation because of the specificity of live working. A simple and practical correction method is introduced for conference, which is simple for field operation and easier to learn and thus has practical significance.