高电压技术2017，Vol.43Issue(8)：2733-2738,6.DOI:10.13336/j.1003-6520.hve.20170731039
光纤复合架空地线直流融冰绝缘化改造对地线绝缘子与并联放电间隙的电气要求
Electrical Requirements for Ground Wire Insulator and Parallel Discharge Clearance During Insulation Reconstruction for OPGW DC De-icing
摘要
Abstract
In order to satisfy the demands of DC de-icing of optical fiber composite overhead ground wire (OPGW) and solve questions such as circulating current loss and its liability in suffering from lightning stroke and broken,the grounding method of OPGW must be changed from the current commonly-used method of being grounded at every towers to being grounded at one tower.OPGW would be connected with tower by ground wire insulator,which should be equipped with protective discharge clearance.Consequently,we put forward an idea that the clearance distance should not only satisfy the requirements of withstanding the induced voltage and the de-icing voltage,but also ensure reliable breakdown at lightning voltage.Moreover,we calculated and experimentally researched the electrical characteristics of discharge clearance at normal operation,on de-icing,and in lightning conditions,respectively.Results indicate that discharge clearance should be set from 20 to 100 mm to withstand power frequency induction voltage.Furthermore,discharge clearance should be set more than 60 mm to withstand DC de-icing voltage,which is-22 kV at most.Considering the dispersion of clearance discharge,the clearance should be appropriately increased.The recommended value of discharge clearance is from 70 to 80 mm.The lightning impulse discharge voltage of such clearance is generally not more than 100 kV.However,as transmission line is struck by lightning,overvoltage on insulator and clearance is 885 kV at least,even up to a few MV.Clearance can be broken down reliably to ensure safety of insulator.Research results can provide a theoretical support and data support for OPGW de-icing insulation reconstruction.关键词
OPGW/光纤复合架空地线/逐塔接地/单点接地/地线绝缘子/并联放电间隙/直流融冰/绝缘化改造Key words
OPGW/optical fiber composite overhead ground wire/grounded at every tower/grounded at one tower/ground wire insulator/parallel discharge clearance/DC de-icing/insulation reconstruction引用本文复制引用
陈秀娟,夏潮,朱海宇,马振国,殷禹,张晔..光纤复合架空地线直流融冰绝缘化改造对地线绝缘子与并联放电间隙的电气要求[J].高电压技术,2017,43(8):2733-2738,6.基金项目
国家电网公司重点科技项目(TX71-13-031).Project supported by Key Science and Technology Project of SGCC (TX71-13-031). （TX71-13-031）
