摘要
特高压直流工程电压等级的提升将带来系统和设备绝缘水平的大幅增加。该研究基于±1 100 kV昌吉—古泉特高压直流系统提出了一种新型绝缘配合方案,它在保留以往绝缘配合方案中绝大部分避雷器的基础上,在高端和低端Yy换流变阀侧分别新增配置了AH和AL避雷器。通过分析两处避雷器的持续运行电压特点,选取了较为可靠的荷电率水平;与以往绝缘配置方案相比,将高端和低端Yy换流变阀侧操作绝缘水平分别降低6%和17%,并将高端Yy换流变阀侧的操作绝缘水平控制在2 100 kV。通过合理配置极线避雷器,与现有±800 kV直流工程极线侧设备绝缘水平线性外推值相比,±1 100 kV直流极线侧设备绝缘水平降低8%。直流系统过电压仿真计算结果验证了新的绝缘配合方案是合理的。
The voltage level upgrade of UHVDC project will substantially increase the levels of system and equipment insulation.Consequently,we proposed a new insulation coordination scheme based on the Changji-Guquan ±1 100 kV UHVDC project.On the basis of retaining most of the arresters in the past insulation coordination program,new AH and AL arresters were added at the valve sides of HY and LY converter transformers.The more reliable chargeability were selected after analyzing the characteristics of the continuous operating voltage of AH and AL arresters,thereby,the insulation levels of the valve side of HY and LY converter transformers were reduced by 6% and 17%,respectively,compared with the previous insulation configuration scheme.And the insulation level of the valve side of HY converter transformers was controlled in 2 100 kV.By adopting appropriate pole line arrester configuration,the equipment insulation level of ±1 100 kV UHVDC pole line side can be reduced by 8% compared with the extrapolated value from ±800 kV to ±1 100 kV based on the linear relationship.Simulation results show that the new insulation coordination scheme is reasonable.
作者
郭贤珊
赵峥
付颖
乐波
厉璇
GUO Xianshan;ZHAO Zheng;FU Ying;YUE Bo;LI Xuan(State Grid Corporation of China, Beijing 100031, China;State Grid Economic and Technological Research Institute Co., Ltd., Beijing 102209, China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2018年第4期1343-1350,共8页
High Voltage Engineering
基金
国家电网公司科技项目(SGTYHT/17-JS-092)~~
