不同海拔下配电网接地电阻器温升研究

张梁; 赵振刚; 王海林; 罗川; 张大骋; 李川

doi:10.13433/j.cnki.1003-8728.20200059

不同海拔下配电网接地电阻器温升研究

doi: 10.13433/j.cnki.1003-8728.20200059

张梁^1,,
赵振刚^1, ,,
王海林¹,
罗川¹,
张大骋¹,
李川^{1, 2}

1.
昆明理工大学信息工程与自动化学院, 昆明 650500
2.
昆明理工光智检测科技有限公司, 昆明 650500

基金项目:

国家自然科学基金项目 61962031

国家自然科学基金项目 51567013

云南省应用基础研究项目 2018FB095

详细信息

作者简介:
张梁(1996-), 硕士研究生, 研究方向为仪器仪表检测, 数据处理, 2791681331@qq.com

通讯作者:
赵振刚, 副教授, 硕士生导师, zhaozhenganghit@126.com

中图分类号: TH707
计量
- 文章访问数: 100
- HTML全文浏览量: 39
- PDF下载量: 17
- 被引次数: 0
出版历程
- 收稿日期: 2019-11-05
- 刊出日期: 2021-03-01

Exploring Temperature Rise of Grounding Resistor in Distribution Network under Different Altitude

1.
Faculty of Information Engineering and Automation, Kunming University of Science and Technology, Kunming 650500, China
2.
Kunming Intellight Measurement Science and Technology Co., Ltd., Kunming, 650500, China

摘要

摘要: 高原环境下接地电阻器的热生成与热传导与平原相比差异巨大，从而导致电阻器故障频发，无法保证配电网系统的正常运行。本文对电阻器的热生成与热传导进行分析，建立了接地电阻器与周围环境的对流换热系数模型；并对0~5 km不同海拔条件下电阻器温升进行有限元分析，得出了接地电阻器温升与海拔高度间的线性关系。对高原环境下配电网的故障诊断做出有效的判断，减少电阻器的维护成本。
- 高原环境 /
- 热生成 /
- 热传导 /
- 接地电阻器
Abstract: The heat generation and heat conduction of a grounding resistor in the plateau environment are quite different from those in the plain, lead to frequent faults in the grounding resistor and cannot guarantee the normal operation of the distribution network. In this paper, the heat generation and heat conduction of the grounding resistor are analyzed, and the convection and heat transfer coefficient model between the grounding resistor and the surrounding environment is established. The finite element analysis of the temperature rise of the grounding resistor at different altitudes from 0 to 5 km is carried out, and the linear relationship between the temperature rise of the grounding resistor and its altitude is obtained, providing reference for the normal operation of the distribution network in the plateau environment and reducing the accidents of the grounding resistor burning.
- plateau environment /
- heat generation /
- heat conduction /
- grounding resistor

HTML全文

图 1 海拔为2 km时电阻器的温升

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图 2 电阻器温升与海拔的关系

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图 3 实验原理图

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图 4 电阻器通电温升图

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图 5 电阻器实验结果与仿真结果的对比

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表 1 常量系数C与n的取值表

空气流动状态	常量系数C	常量系数n	Gr的适用范围
层流	0.48	0.25	1.43×10⁴~5.76×10⁴
过渡带	0.016 5	0.42	5.76×10⁴~4.65×10⁴
湍流	0.11	1/3	>4.65×10⁴

下载: 导出CSV

表 2 接地电阻在不同海拔下的对流换热系数

海拔A/km	月平均相对湿度RH/%	年平均环境温度T₂/℃	平均大气压P/Pa	平均空气密度ρ/(kg·m^-3)	对流换热系数h/(W·(m²·K)^-1)
0	20	20	101 325	0.994 7	8.129 0
1	20	20	89 875	0.858 6	7.127 0
2	15	15	79 495	0.846 4	7.023 9
3	15	10	70 108	0.781 1	6.699 0
4	15	5	61 640	0.710 2	6.375 0
5	15	0	54 020	0.612 3	5.875 4

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表 3 不同海拔下电阻器的温升

海拔A/km	0	1	2	3	4	5
温升ΔT/K	600.52	612.54	617.22	624.66	632.18	642.01

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表 4 不同海拔下温升拟合误差

海拔A/km	仿真结果/K	拟合结果/K	相对误差/%
0	600.52	601.965	0.24
1	612.54	609.788	0.45
2	617.22	617.611	0.06
3	624.66	625.434	0.12
4	632.18	633.257	0.17
5	642.01	641.08	0.14

下载: 导出CSV

表 5 实验室环境参数

海拔A/m	相对湿度RH/%	环境温度T/℃
1 901	15	15

下载: 导出CSV

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