摘要
220kV主变中性点接地方式直接影响到电网的安全稳定运行,当220kV主变110kV侧发生单相接地短路时,合理的中性点接地方式可以避免主变遭受冲击而损坏。本文列举了220kV主变中性点四种接地方式,分析了220kV主变110kV侧发生单相短路时流过主变及故障点的短路电流的简化计算方法,并用PSCAD软件仿真并分析某110kV系统发生单相短路故障时不同中性点接地方式对流过主变及故障点短路电流大小的影响,最终给出最优接地方案。
The safety and stability of the grid could be directly affected by neutral grounding moods of 220kV transformer. Reasonably neutral grounding mood will protect the transformer from being damaged when single-phase short circuit occurs in 110kV side of 220kV transformer. This paper lists four neutral grounding moods of 220kV transformer and analysis how to simply calculate short-circuit current of main transformer and fault point when single-phase short circuit occurs in 110kV side of 220kV transformer. We use PSCAD to simulate and analysis the impact on the magnitude of short circuit of main transformer and failure point. At last we give the best neutral grounding mood.
出处
《科技视界》
2013年第23期7-9,共3页
Science & Technology Vision
关键词
单相接地
中性点
接地方式
短路电流
仿真
Single phase short
Neutral grounding
Grounding mood
Short current
Simulation
