[1]王 尉.110kV 中性点经电阻接地系统的研究[J].大众科技,2013,15(10):68.
[J].Popular Science & Technology,2013,15(10):68.
点击复制
110kV 中性点经电阻接地系统的研究()
《大众科技》[ISSN:1008-1151/CN:45-1235/N]
- 卷:
-
第15卷
- 期数:
-
2013年10期
- 页码:
-
68
- 栏目:
-
电力与机械
- 出版日期:
-
2013-11-29
文章信息/Info
- 作者:
-
王 尉
-
（广州供电局，广东 广州 510000）
- 关键词:
-
【关键词】110kV 系统; 中性点接地电阻; 单相接地; 故障电流; 电压跌落
- 文献标志码:
-
A
- 摘要:
-
【摘 要】我国 110kV 配电系统大多采用中性点直接接地方式，发生单相接地故障时负荷侧电压跌落严重，影响对用户的 正常供电；短路电流也很大，有些情况下甚至会超过三相短路电流，影响断路器遮断容量的选择。文章对 110kV 系统中性点经 电阻接地方式进行了研究，结果表明，与 110kV 系统中性点直接接地相比，中性点经电阻接地可有效减小单相接地故障电流， 使其小于三相短路电流，且明显抑制单相接地故障时负荷侧的电压跌落程度，提高电能质量。如果合理选择中性点接地电阻值， 还能保证各种过电压水平不超过现有 110kV 电气设备绝缘水平，继电保护装置也能正确动作。经 PSCAD 软件进行仿真，验证 了以上结论。 【中图分类号】TM 7 【文献标识码】A 【文章编号】1008-1151(2013)10-0068-04 Study on resistance grounded system of 110kV
Abstract: China’s 110kV distribution systems mainly use the way of direct grounding. When single-phase grounding fault occurs, a serious voltage sag in the load side will not satisfy the users’ requirements for high power quality. And the fault current is very large, sometimes even larger than the three-phase fault current. 110kV resistance grounding system has been studied in this paper and the results show that, comparing with direct grounding system, this mode can inhibit the single-phase ground short-circuit current and reduce the voltage sag of load side to improve power quality. If we reasonable choice the value of the neutral resistor, the over-voltage level will not exceed the insulation level of existing electrical equipment and the relay protection devices can act correctly. PSCAD simulation has verified that. Key words: 110kV system; neutral grounding resistor; single-phase grounding; fault current; voltage sag
更新日期/Last Update:
2014-03-18