Comparative Analysis of Low Wind Pressure Conductor and Conventional Conductor

doi:10.11985/2019.04.010

Abstract

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

CLC Number:

TM751

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.

Figures/Tables 10

References 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