基于最大信息系数的同塔双回输电线路感应电影响因素敏感性分析

目前,同塔多回和高载流导线技术被广泛用来提升线路传输容量,而其感应电水平是检修作业人员防护和设备选型的重要依据.文中针对某大容量、远距离的500 kV同塔双回输电线路建立线路仿真模型,研究了同塔双回线路共塔长度、避雷线保护角、线路潮流、回路间导线水平间距和土壤电阻率等五个因素对感应电的影响,并基于最大信息系数(MIC)对各因素的敏感性进行了定量分析.结果表明:静电感应电压主要受导线间距(MIC =0.735)和避雷线保护角(MIC =0.69)影响;电磁感应电压与双回线路共塔长度、潮流及导线间距有高度相关性;共塔长度(MIC =0.82)和导线间距(MIC =0.70)明显影响静电感应电流的大小;电磁感应电流与线路潮流、导线间距均达到高度相关;而土壤电阻率的影响忽略不计.研究结果为超高压输电线路的检修和作业人员安全防护措施的制定提供了技术参考.

Sensitivity analysis of influencing factors of induced electricity basedon MIC in double circuit transmission line

At present, the same-tower multi-circuit and high-current-carrying wire technology is used to increase the transmission capacity of the line, and its induction level is an important basis for the protection of maintenance workers and equipment selection. This article establishes a line simulation model for a 500kV double-circuit transmission line on the same tower, and studies the influence of the length of the double-circuit line on the same tower, the protection angle of the lightning line, the line flow, the horizontal spacing of the conductors between the loops, and the induced electricity of the soil resistance. The information coefficient (MIC) analyzes the sensitivity of each factor. The results show that: the electrostatic voltage is affected by the conductor (MIC=0.735) and the protection angle (MIC=0.69); the electromagnetic voltage is related to the length of the common tower, the power flow and the conductor spacing; the length of the common tower (MIC=0.82) and the conductor spacing (MIC= 0.70) Obviously affect the magnitude of electrostatic current; electromagnetic current is highly correlated with tidal current and spacing; the influence of soil resistivity is negligible. The research results provide a technical reference for the maintenance of EHV transmission lines and the formulation of safety protection measures for operators.