中国电机工程学报Issue(18)：2983-2989,7.DOI:10.13334/j.0258-8013.pcsee.2014.18.015
±800 kV同塔双回直流线路杆塔空气间隙的放电特性影响因素研究
Research on the Influence Factors of Discharge Characteristics of Air Gaps for ±800 kV Double Line Transmission Towers
丁玉剑 1廖蔚明 1宿志一 1张泽 2律方成2
作者信息
- 1. 中国电力科学研究院，北京市 海淀区 100192
- 2. 华北电力大学 保定，河北省 保定市 071003
- 折叠
摘要
Abstract
As the voltage grade is higher for the ±800 kV double line transmission tower, and the shape and sizes of the tower are different from that of ±500 kV, ±660 kV double line transmission towers, so the discharge characteristics of the tower gaps tend to be different. In order to choose the appropriate air gap distances, the factors which could affect the impulse discharge characteristics of the upper and lower air gaps of ±800 kV DC double circuit transmission towers were studied by tests on real size simulation towers in this paper. The influence of the width of the lower level vertical frame to the switching impulse discharge characteristics of lower air gaps, the influence of the grading ring sizes and the DC operation voltage to the discharge characteristics of the tower air gaps, and the influence of the lower frame to the discharge characteristics of the upper air gaps for ±800 kV DC double circuit transmission towers were discussed. Also the lightning protection performance of the tower was checked in the case of shorter the distances between the upper line and the lower frame. The results show:the formula used before for correction of the influence of tower width to the switching impulse discharge voltage of air gaps is inapplicable to the ±800 kV DC double circuit transmission towers;the relationship between the sizes of grading rings and discharge voltages is in positive correlation; the existing of DC electrical field has obvious influence to the discharge paths but not to the discharge voltage value. The distance between upper lines and lower frames can be decreased, which would tend to decline the lightning protection performance of the tower a little. The research results could be used to guide the design of the ±800 kV double circuit transmission projects.关键词
±800 kV直流/同塔双回/空气间隙/冲击放电Key words
±800 kV DC/double circuit transmission tower/air gap distance/impulse discharge分类
信息技术与安全科学引用本文复制引用
丁玉剑,廖蔚明,宿志一,张泽,律方成..±800 kV同塔双回直流线路杆塔空气间隙的放电特性影响因素研究[J].中国电机工程学报,2014,(18):2983-2989,7.
