考虑地表高阻层的直流接地极跨步电压限值计算方法

doi:10.11930/j.issn.1004-9649.2017.02.150.07

中国电力 ›› 2017, Vol. 50 ›› Issue (2): 150-156.DOI: 10.11930/j.issn.1004-9649.2017.02.150.07

考虑地表高阻层的直流接地极跨步电压限值计算方法

杨剑, 潘文霞, 孙宏航

河海大学能源与电气学院,江苏南京 211100

收稿日期:2016-11-01 出版日期:2017-02-20 发布日期:2017-02-22
作者简介:杨剑（1992—）,男,江苏溧阳人,硕士研究生,从事电力系统接地技术研究。E-mail:yangjian9535@163.com
基金资助:
国家自然科学基金资助项目（51377047）

Research on Calculation Method for Step Voltage Limitation of DC Grounding Electrode Based on Surface High-Resistance Covering

YANG Jian, PAN Wenxia, SUN Honghang

College of Energy and Electrical Engineering, Hohai University, Nanjing 211100, China

Received:2016-11-01 Online:2017-02-20 Published:2017-02-22
Supported by:
This work is supported by National Natural Science Foundation of China (No. 51377047).

摘要/Abstract

摘要： 为保证直流接地极附近人身安全,接地设计时必须满足跨步电压限值要求。针对水平双圆环形直流接地极,考虑在接地极上方地表铺设高阻层,研究在此条件下跨步电压限值的计算方法,并给出了新计算公式,最后基于边界元法对不同土壤条件下的直流接地参数进行研究分析。研究结果表明：直流接地极地表铺设高阻层能够有效提高人体耐受的跨步电压限值,建议铺设厚度为0.1~0.2 m;为明显提高跨步电压限值,选取的高阻层电阻率最好大于1 000 Ω·m。研究结果还表明,铺设高阻层对直流接地极的接地电阻、地电位升、地面跨步电压以及泄漏电流的分布影响很小,对金属设施的影响也基本可以忽略。

关键词: 直流接地极, 地表高阻层, 土壤电阻率, 跨步电压, 数值分析

Abstract: In order to guarantee the human safety near the DC grounding electrode, the requirement of step voltage limit must be satisfied in grounding design. Based on the horizontal double-ring DC grounding electrode, the computation method of step voltage limit is studied under the condition of covering the ground surface of grounding electrode with high-resistance layer, and a new computational formula is given. And then the grounding characteristics under different soil conditions is analyzed by using the boundary element method. The investigation results show that the surface high-resistance covering can greatly improve the tolerance limit of the step voltage for human body. The thickness of high-resistance layer is suggested to be 10~20 cm. In order to substantially improve the tolerance limit, the resistivity of high-resistance covering is better to be greater than 1 000 Ω·m. It is also shown that the surface high-resistance covering has little influences on the grounding resistance, ground potential rise, step voltage and distribution of leakage current, and its influence on the metallic facilities can also be neglected.

Key words: DC grounding electrode, surface high-resistance covering, soil resistivity, step voltage, numerical analysis

中图分类号:

TM834

杨剑, 潘文霞, 孙宏航. 考虑地表高阻层的直流接地极跨步电压限值计算方法[J]. 中国电力, 2017, 50(2): 150-156.

YANG Jian, PAN Wenxia, SUN Honghang. Research on Calculation Method for Step Voltage Limitation of DC Grounding Electrode Based on Surface High-Resistance Covering[J]. Electric Power, 2017, 50(2): 150-156.

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考虑地表高阻层的直流接地极跨步电压限值计算方法

Research on Calculation Method for Step Voltage Limitation of DC Grounding Electrode Based on Surface High-Resistance Covering

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