电力系统临近电安全距离预警系统研究*

doi:10.11985/2022.01.024

摘要/Abstract

摘要：

因部分施工作业的环境复杂性及人员操作的不确定性,由施工机械跨越临近带电安全距离而导致的恶性事件仍在发生,对电力系统稳定可靠运行带来恶劣影响。因此,研究一种电力系统临近电安全距离预警系统。介绍基于临界电场阈值的安全距离预警系统基本工作原理;继而建立电力系统带电作业的三维有限元模型,并以35~500 kV典型交流输电线路为例,仿真分析不同输电线路等级以及不同作业位置下的电场阈值变化特性,从而为临近电预警提供依据;最后利用所研制系统在现场进行了电场强度、安全距离大小的实测,对预警系统进行了验证。实测结果表明,本系统在临界电场下发生报警时,实际测得的最小安全距离要比标准中数值大0.7~1.6 m,安全裕度可达20%,优于同类技术。研究结果可为电力系统安全稳定运行提供技术支撑。

关键词: 带电作业, 安全距离, 输电线路, 电场阈值, 入侵设备

Abstract:

Due to the environmental complexity of some construction operations and the uncertainty of personnel operations, vicious incidents caused by construction machinery crossing the nearby live safety distance still occur, which has a bad impact on the stable and reliable operation of the power system. Therefore, an early warning system for near electrical safety distance in power system is studied. First, the basic working principle of the safety distance early warning system based on critical electric field threshold is introduced. Then, by establishing a three-dimensional finite element model of the power system on-line operation, and taking typical 35-500 kV AC transmission line as examples, the electric field threshold change characteristics under different transmission line levels and different operating positions are simulated and analyzed, so as to provide a basis for the nearby electric warning. Finally, the electric field strength and safe distance are measured on the spot using the developed system. The actual measurement results well verify the early warning system, which show that when the system generates an alarm under a critical electric field, the actual minimum safety distance measured is 0.7-1.6 meters larger than the standard value, and the safety margin can reach 20%, which is better than similar technologies. The research results can provide technical support for the safe and stable operation of the power system.

Key words: Live working, safe distance, transmission line, electric field threshold, intrusion equipment

中图分类号:

TM72

张远建, 陈搏卿, 姜炫丞, 康坦, 张乾雷, 王士龙. 电力系统临近电安全距离预警系统研究^*[J]. 电气工程学报, 2022, 17(1): 186-191.

ZHANG Yuanjian, CHEN Boqing, JIANG Xuancheng, KANG Tan, ZHANG Qianlei, WANG Shilong. Research on Early Warning System of Electric Safety Distance Near Electric Power System[J]. Journal of Electrical Engineering, 2022, 17(1): 186-191.

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参数	数值
电压等级/kV	35	110	220	500
导线类型	LGJ-185/25	LGJ-240/30	2×LGJ-300/25	4×LGJ-400/25
导线直径/mm	18.90	21.60	23.76	27.63
边相导线高度/m	6.00	10.00	12.00	16.00
中相导线高度/m	6.00	13.00	16.00	24.00
相间距/m	3.50	4.50	6.50	9.00
地线类型	—	GJ-50	GJ-50	GJ-70
地线直径/mm	—	9.0	9.0	11.0
地线高度/m	—	16.0	20.0	30.0
地线间距/m	—	5.4	8.0	14.0

参数		电压等级/kV
参数		35	110	220	500
临界电场强度/(kV/m)	阈值	3.8	9.1	14.3	20.7
临界电场强度/(kV/m)	实际值	4.1	9.5	15.6	22.4
安全距离/m	理论值	4.0	4.5	6.0	8.0
安全距离/m	实际值	5.1	5.2	7.3	9.6
安全距离相对误差(%)		21.5	13.4	21.7	16.7