不同退火温度下输电导线疲劳性能的实验分析

任贤达; 刘佳琼; 唐震; 武晓刚; 陈维毅

doi:10.11858/gywlxb.20180566

不同退火温度下输电导线疲劳性能的实验分析

doi: 10.11858/gywlxb.20180566

任贤达^1,,
刘佳琼¹,
唐震²,
武晓刚¹,
陈维毅^1,*, ,

1.
太原理工大学生物医学工程学院应用力学与生物医学工程研究所，山西太原　030024
2.
国网山西省电力科学研究院，山西太原　030001

基金项目: 国家自然科学基金（11572213）

详细信息

作者简介:
任贤达（1989－），男，硕士，主要从事材料结构及力学性能研究. E-mail：359024389@qq.com

通讯作者:
陈维毅（1961－），男，博士，教授，主要从事生物力学研究. E-mail：2390398408@qq.com

中图分类号: V216.3
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出版历程
- 收稿日期: 2018-06-18
- 修回日期: 2018-06-28

Experimental Analysis of Fatigue Performance in Transmission Lines at Different Annealing Temperatures

1.
Institute of Applied Mechanics and Biomedical Engineering, School of Biomedical Engineering, Taiyuan Polytechnic University, Taiyuan 030024, China
2.
Shanxi Electric Power Research Institute, Taiyuan 030001, China

摘要

摘要: 输电线路是输电网络的重要组成部分。然而，电网输电线路山火频发，严重威胁输电线路的安全运行，因此研究输电导线在山火过后的力学性能特别是疲劳寿命尤为重要。考虑到导线在微风振动中的疲劳破坏主要由其拉伸力的变化引起，为确定山火过后输电导线的力学性能特别是疲劳性能的变化情况，利用恒温管式电阻炉模拟不同的架空输电导线（钢芯铝绞线）受到不同温度的山火烧烤，然后对冷却后的单丝导线进行疲劳拉伸试验，得到疲劳拉伸破坏次数随退火温度变化的规律，并与新导线和真实山火后的导线进行对比。试验结果表明：导线的疲劳极限随着退火温度的增加而减小；退火温度大于250 ℃时，导线的拉伸循环次数急剧下降；退火温度大于350 ℃时，拉伸循环次数趋于稳定。研究结果可为输电线路发生山火情况下的安全运行提供参考。
- 架空导线 /
- 疲劳 /
- 退火温度 /
- 山火
Abstract: Transmission line is the important equipment to transport electrical energy through power grid. Mountain fires are frequent events in recent years, which severely damages the safe operation of the high voltage transmission lines. Therefore, it is very important to study the mechanical characteristics of transmission lines after mountain fire. Based on the simulation test of transmission lines in the mountain fire, we studied the effects of the annealing temperature on the fatigue of overhead transmission lines. The fatigue failure of the transmission lines in aeolian vibration was reflected in the continuous axial fatigue tensile state. First, we conducted an experiment by the thermostatic tube X resistance furnaces to stimulate different transmission lines (JL/G1A-400/35, JL/G1A-300/25, JL/G1A-240/30, JL/G1A-300/40) burned in the mountain fire at different temperatures. Then, we carried out a fatigue tensile test on the single transmission line, and found that the frequency of fatigue tensile failure was correlated with temperature. Furthermore, we compared the data between new transmission lines and those burned in an actual mountain fire. Finally, we proposed reference for the protection of transmission lines in a mountain fire and prevention against being burned. The results showed that the fatigue limit of wires was reduced with the rise of the temperature. When the temperature was between 250 ℃ and 300 ℃, the tensile cycle times deceases sharply; when the temperature is above 300 ℃, it tended to be stable.
- overhead line conductors /
- fatigue /
- annealing temperature /
- mountain fire

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图 1 4种型号的原始导线

Figure 1. Four kinds of original wires

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图 2 JL/G1A-400/35导线截面图

Figure 2. Sectional view of wire JL/G1A-400/35

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图 3 新导线、真实山火和300 ℃烧过导线的单丝疲劳对比

Figure 3. Comparison of monofilament fatigue of new wire and the wires burned by mountain fire and at 300 °C

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图 4 不同处理温度下3种导线的循环次数

Figure 4. Cycle times of three wires at different annealing temperatures

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表 1 4种型号钢芯铝绞线参数

Table 1. Parameters of four types of ACSR (aluminium conductor steel reinforced)

Type of wire	Number of aluminum wire	Number of steel wire	Aluminum wire’s diameter/mm	Steel wire’s diameter/mm	Rated tensile force/kN
JL/G1A-400/35	48	7	3.22	2.50	103.67
JL/G1A-300/25	48	7	2.85	2.22	83.76
JL/G1A-240/30	24	7	3.60	2.40	75.19
JL/G1A-300/40	24	7	3.99	2.66	92.36

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表 2 JL/G1A-400/35导线在不同温度下的疲劳拉伸次数

Table 2. Fatigue cycle number of wire JL/G1A-400/35 at different temperatures

Type of wire	T/℃	n
Type of wire	T/℃	Outer layer	Middle level	Inner layer	Steel core
Wire after annealing	150	120 000	120 000	120 000	9 821
	200	113 411	120 000	120 000	9 885
	250	120 000	120 000	120 000	5 065
	300	84 491	94 529	97 456	5 537
	350	9 885	7 521	4 028	4 424
	400	4 383	5 888	6 160	2 858
	450	3 736	3 928	3 722	1 495
	500	2 504	1 144	1 041	956
New wires		81 071	120 000	79 784	6 054
Wire after mountain fire		91 824	120 000	71 748	14 549

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