|
|
|
| Research on Three-phase Voltage Unbalance of 66kV Bus in Substation |
| Yang Lin1, Wang Liang2, Zhao Shouzhong1, Li Fengyu1, Wang Kai3 |
1. State Grid Liaoning Electric Power Supply Co., Ltd, Skills Training Center, Jinzhou, Liaoning 121001;
2. State Grid Liaoning Electric Power Supply Co., Ltd, Dispatching Control Center, Shenyang 110006;
3. State Grid Jinzhou Electric Power Supply company, Jinzhou, Liaoning 121000 |
|
|
|
|
Abstract Many problems have been caused by unbalanced three-phase parameters in 66kV grid, such as three-phase voltage unbalance,higher displacement voltage of neutral-point,virtual grounding and difficult parameters setting of arc suppression coil etc. The problems will not only harm the safe operation, normal output of transformers and other facilities seriously, but also result in malfunction of relay protection, automatic safety facilities and increase of the power loss. The paper analysis theoretically the reason why arc suppression coil caused voltage more unbalanced seriously. The three methods includes reducing the asymmetry degree of grid, increasing off resonance degree of the compensation power grid and improving damping ratio of compensation power grid, reducing degree of three-phase voltage unbalance, which achieve good results.
|
|
Published: 20 January 2017
|
|
|
|
| Cite this article: |
|
Yang Lin,Wang Liang,Zhao Shouzhong等. Research on Three-phase Voltage Unbalance of 66kV Bus in Substation[J]. Electrical Engineering, 2017, 18(1): 61-64.
|
|
|
|
| URL: |
|
http://dqjs.cesmedia.cn/EN/Y2017/V18/I1/61
|
[1] DL/T 620—1997 交流电气装置过电压保护和绝缘配合[S].
[2] 王代弟. 配电网三相不平衡问题的分析与研究[D]. 沈阳: 沈阳工业大学, 2007.
[3] GB/T 15543—2008 电能质量三相电压允许不平衡度[S].
[4] 何昌雄, 唐军, 陈小平, 等. 同祥变35kV母线电压不平衡原因及对策分析[J]. 电力电容器与无功补偿, 2015, 36(5): 80-87.
[5] 李嗣明, 何婧, 张熙军, 等. 消弧线圈投入后引起系统电压不平衡原因分析及解决办法[J]. 电力系统保护与控制, 2008, 36(24): 124-128.
[6] 刘清凡. 消弧线圈接入后一次系统不平衡加剧原因分析[J]. 继电器, 2005, 33(3): 79-82, 88.
[7] 邹林, 林福昌, 龙兆芝, 等. 输电线路不平衡度影响因素分析[J]. 电网技术, 2008, 32(2): 283-286.
[8] 陈忠仁, 吴维宁, 陈家宏, 等. 补偿电网阻尼率及脱谐度的分析[J]. 华东电力, 2005, 33(3): 44-46.
[9] 林志雄, 陈岩, 蔡金锭, 等. 低压配电网三相不平衡运行的影响及治理措施[J]. 电力科学与技术学报, 2009, 24(3): 63-67. |
|
|
|
2017, Vol. 18 
