电网技术
電網技術
전망기술
POWER SYSTEM TECHNOLOGY
2013年
11期
3281-3287
,共7页
丁玉剑%宋刚%陈稼苗%应建国%邢月龙%李庆峰%廖蔚明
丁玉劍%宋剛%陳稼苗%應建國%邢月龍%李慶峰%廖蔚明
정옥검%송강%진가묘%응건국%형월룡%리경봉%료위명
500kV%同塔双回%紧凑型%垂直排列%带电作业%安全距离
500kV%同塔雙迴%緊湊型%垂直排列%帶電作業%安全距離
500kV%동탑쌍회%긴주형%수직배렬%대전작업%안전거리
500kV%double circuit transmission lines on the same tower%compact type%vertical arrangement%live working%safety distance
由于塔头结构的变化，在三相导线垂直排列布置方式的交流500 kV同塔双回紧凑型输电线路上带电作业时，作业人员进出等电位的路径与一般紧凑型线路有很大不同。针对此种线路杆塔的特殊性，分别对进出杆塔上、中、下三相导线等电位的作业方式进行了试验研究，得到了组合间隙的50%操作冲击放电电压和组合间隙距离的关系曲线，并根据试验结果计算分析了带电作业危险率和所需的最小安全距离。通过试验分析了相间操作冲击放电电压对带电作业的影响，确定了带电作业在不同过电压幅值时相间所需的最小安全距离。进行了相间操作冲击电压下带电作业人员在导线上等电位作业的模拟试验，校核了各种工况下的带电作业的危险率，确定了安全合理的带电作业方式。
由于塔頭結構的變化，在三相導線垂直排列佈置方式的交流500 kV同塔雙迴緊湊型輸電線路上帶電作業時，作業人員進齣等電位的路徑與一般緊湊型線路有很大不同。針對此種線路桿塔的特殊性，分彆對進齣桿塔上、中、下三相導線等電位的作業方式進行瞭試驗研究，得到瞭組閤間隙的50%操作遲擊放電電壓和組閤間隙距離的關繫麯線，併根據試驗結果計算分析瞭帶電作業危險率和所需的最小安全距離。通過試驗分析瞭相間操作遲擊放電電壓對帶電作業的影響，確定瞭帶電作業在不同過電壓幅值時相間所需的最小安全距離。進行瞭相間操作遲擊電壓下帶電作業人員在導線上等電位作業的模擬試驗，校覈瞭各種工況下的帶電作業的危險率，確定瞭安全閤理的帶電作業方式。
유우탑두결구적변화，재삼상도선수직배렬포치방식적교류500 kV동탑쌍회긴주형수전선로상대전작업시，작업인원진출등전위적로경여일반긴주형선로유흔대불동。침대차충선로간탑적특수성，분별대진출간탑상、중、하삼상도선등전위적작업방식진행료시험연구，득도료조합간극적50%조작충격방전전압화조합간극거리적관계곡선，병근거시험결과계산분석료대전작업위험솔화소수적최소안전거리。통과시험분석료상간조작충격방전전압대대전작업적영향，학정료대전작업재불동과전압폭치시상간소수적최소안전거리。진행료상간조작충격전압하대전작업인원재도선상등전위작업적모의시험，교핵료각충공황하적대전작업적위험솔，학정료안전합리적대전작업방식。
As a result of the change in the structure of the tower head, when live working is carried on double circuit AC 500 kV compact transmission lines on the same tower, where all three-phase conductors are arranged vertically, the path, by which the operator enters into and exits from the equipotential area under such a structure, is quite different from the paths for the live working carried on common compact transmission lines. Based on the particularity of such transmission lines, experimental research on the working modes, by which the operator enters into and exits from equipotential area of upper-, middle-and lower-phase conductors, is performed, and relation curves of 50% switching impulse discharge voltage of combined gap to the gap of combined gap are obtained, and according to experimental results the hazard rate of live working and the required minimum safety distance are calculated and analyzed. The impact of phase-to-phase switching impulse discharge voltage on live working is analyzed by tests and the required minimum phase-to-phase safety distances for live working under different over-voltage amplitudes are determined. Simulative tests of live working operators carrying on equipotential working on the phase conductors under phase-to-phase switching impulse voltage are carried out, and the hazard rates of live working under different operating conditions are verified and the safe and reasonable live working modes are determined.
