摘要
输电线路覆冰跳闸是造成线路跳闸的重要原因之一,云南电网公司通过对500kV输电线路进行地线绝缘化改造,实现了线路地线(光缆)的直流融冰。由于地线绝缘化改造过程中,地线绝缘子的安装方式不同,会导致地线的相对位置不同,进而使得输电线路的保护角发生变化,影响线路的绕击耐雷性能。本文在不同的地线绝缘化改造方式下,通过ATP-EMTP平台计算了5种不同塔型的绕击耐雷水平,并通过电气几何模型(EGM)计算了这些塔型的绕击跳闸率。结果表明,地线绝缘化改造对线路绕击耐雷水平影响较小,但是,对绕击跳闸率影响较大。
Transmission line icing tripping is one of the important reasons causing the line tripping. The Yunnan Power Grid Co through the 500 kV transmission line to the ground wire insulation to achieve the line ground （fiber optic cable） of the DC melting ice. Because the wire insulation transformation process, installation of ground insulator is different, different relative positions will lead to the ground, and then make the protection of transmission line angle changes, affect the withstand performance of shielding line. Based on the different wire insulation transformation mode, lightning level around 5 different types of tower was calculated by the ATP-EMTP platform, and through the electrical geometric model （EGM） shielding failure trip rate of these types of tower are calculated. The results show that the wire insulation transformation on the line around the small effect of lightning level but a greater impact on the shielding failure rate.
出处
《云南电力技术》
2017年第2期129-132,共4页
Yunnan Electric Power
关键词
地线绝缘化
绕击
耐雷水平
跳闸率
电气几何模型
wire insulation
shielding
lightning protection level
failure rate
electrical geometric model
