低风压导线与常规导线对比分析

doi:10.11985/2019.04.010

摘要/Abstract

摘要：

架空输电线路是电力系统的重要组成部分,而导线则是输电线路设计的一个重要课题。导线受到的风压约占整个输电线路的50％~70％,合理选择导线,降低导线风压对于降低线路造价及提高线路运行安全具有重要意义。以500 kV输电线路为基础,对低风压导线与常规导线在输送容量、电磁环境、电气性能和力学性能等方面进行对比分析,并对两种导线的本体投资进行比较,确定低风压导线不仅能够大幅度降低导线风压,而且在电气性能、力学性能及导线本体投资方面均优于常规导线。因此,在输电线路中应用低风压导线具有明显优势。

关键词: 输电线路, 低风压导线, 导线性能, 对比分析

Abstract:

Overhead transmission line is an important part of power system, and the selection of conductor is an important topic of transmission line design. The wind pressure of conductor accounts for about 50% - 70% of the whole transmission line. Therefore, reasonable selection of conductor and reduction of wind pressure are of great significance to reduce the cost of the line and improve the safety of line operation. Based on 500 kV transmission line, comparative analysis on transmission capacity, electromagnetic environment, electrical performance and mechanical performance of low wind pressure conductor and conventional conductor is made, and comparison on investment is also made. It is sure that low wind pressure conductor could make wind pressure lower, and it has better performance in electrical performance, mechanical performance and investment on conductor itself than conventional conductor. Therefore, it has obvious advantage to use low wind pressure conductor in transmission lines.

Key words: Transmission line, low wind pressure conductor, wire performance, comparative analysis

中图分类号:

TM751

段旭东,韩宇,陆春阳,姜然凇. 低风压导线与常规导线对比分析[J]. 电气工程学报, 2019, 14(4): 66-71.

Xudong DUAN,Yu HAN,Chunyang LU,Ransong JIANG. Comparative Analysis of Low Wind Pressure Conductor and Conventional Conductor[J]. Journal of Electrical Engineering, 2019, 14(4): 66-71.

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参考文献 16

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导线型号		导线2	导线1
相导线分裂根数		4	4
结构根数	铝	48	–
	铝包钢	–	7
	钢	7	–
直径/mm	铝	3.22	–
	铝包钢	–	2.50
	钢	2.50	–
计算截面/mm²	铝	390.88	390.88
	铝包钢	–	34.36
	钢	34.36	–
	总计	425.24	425.24
外径/mm		26.8	24.44
计算质量/(kg/km)		1 347.5	1 281.63
导线拉断力/N		98 486	96 625
线膨胀系数/(× 10^-6℃^-1)		20.5	21.24
弹性模量/(N/mm²)		65 000	61 870
20℃直流电阻/(Ω/km)		0.073 9	0.069 3
最大使用张力/N		39 394.0	38 649.8
平均运行张力/破坏拉断力		0.25	0.25
相分裂间距/cm		45	45
相分裂间距与单导线直径比		16.8	18.4

导线型号与分裂型式	相导线载流量/A		极限输送容量/MW
导线型号与分裂型式	+70℃	+80℃	+70℃	+80℃
4×导线2	2 631.5	3 171.1	2 164.9	2 608.9
4×导线1	2 662.1	3 226.4	2 190.1	2 654.3

导线方案	临界电场强度 /(kV/cm)	导线表面场强/(kV/cm)				无线电干扰/dB	可听噪声/dB
		边相		中相
		Em	Em/ Emo	Em	Em/ Emo
导线2	20.76	14.94	0.72	15.96	0.77	43.5	50.6
导线1	20.96	15.41	0.74	16.39	0.78	43.8	50.9

导线型号	输送容量/MW	导线输送电流/A	运行温度/℃	交流电阻 /(Ω/km)	电阻功率/(kW/km)	电阻损耗 /(MW·h/km)
导线型号	输送容量/MW	导线输送电流/A	运行温度/℃	交流电阻 /(Ω/km)	电阻功率/(kW/km)	3 000 h	4 000 h	5 000 h
导线2	1 000	303.9	53.5	0.086 14	95.4	286.3	381.8	477.2
导线1	1 000	303.9	52.9	0.079 16	87.7	263.1	350.9	438.6

导线型号			导线2	导线1
最大应力安全系数			2.5	2.5
最大应力年均安全系数			4	4
过载能力/mm	Lo=400 m		25.38	25.83
	Lo=500 m		23.28	23.49
	Lo=600 m		22.49	22.50
高温弧垂/m	Lo=400 m		13.17	12.96
	Lo=500 m		19.56	19.05
	Lo=600 m		27.92	26.97
相导线最大张力/(kN/相)			157.6	154.6
平均运行张力/(kN/相)			98.5	96.6
相导线垂直荷重/(kN/相)			37.0	35.19
相导线风荷重/(kN/相)			35.07	24.71
风偏角/(°) Kv=0.8		大风	59.79	51.80
		操作	32.52	25.40
		外过	21.85	16.60
直线塔中相V串夹角/(°)			100	90
耐张串安全系数	绝缘子型式/kN		2×300	2×300
	最大荷载		3.46	3.53
	常年荷载		5.54	5.65
悬垂串安全系数	绝缘子型式/kN		210	210
悬垂串安全系数	最大荷载		4.41	4.67