| 通过500kV单相主变中性点接地引下线的电流分析 |
| |
| 引用本文： | 李显鹏,章凯峰,钱黎鸣,徐骏. 通过500kV单相主变中性点接地引下线的电流分析[J]. 浙江电力, 2012, 31(3): 22-24 |
| |
| 作者姓名： | 李显鹏 章凯峰 钱黎鸣 徐骏 |
| |
| 作者单位： | 嘉兴电力局,浙江嘉兴,314033 |
| |
| 摘 要： | 为保证中性点可靠接地,某些500 kV单相主变中性点接地方式为Ⅱ型.运行中发现在此接地方式下,系统正常时两接地引下线中会出现较大的异常电流.为此,建立了Ⅱ型接地方式的电路模型,应用叠加定理对电路进行了分析,认为在Ⅱ型接地方式下,3台单相主变间的两段中性点汇流母线存在电阻,是两接地引下线中出现异常电流的原因,现场实测数据验证了模型的正确性.
|
| 关 键 词： | 变压器 Ⅱ型接地 引下线 电流 叠加定理 |
Analysis on Grounding Down Lead Current of Neutral Points for 500 kV Single-phase Transformers |
| |
| LI Xian-peng , ZHANG Kai-feng , QIAN Li-ming , XU Jun. Analysis on Grounding Down Lead Current of Neutral Points for 500 kV Single-phase Transformers[J]. Zhejiang Electric Power, 2012, 31(3): 22-24 |
| |
| Authors: | LI Xian-peng ZHANG Kai-feng QIAN Li-ming XU Jun |
| |
| Affiliation: | (Jiaxing Electric Power Bureau,Jiaxing Zhejiang 314033,China) |
| |
| Abstract: | Some neutral points of 500 kV single-phase transformers use ∏ grounding to ensure the reliability.High abnormal current is found in the two grounding down leads during normal operation of power system in this mode of grounding.Therefore,the circuit model of ∏ grounding is established.Through the analysis on the circuit by superposition theorem,it is found that the resistance of the two neutral point buses between three single-phase transformers led to the abnormal current of the two grounding down leads.The field test verifies the validity of the model. |
| |
| Keywords: | transtormer ∏ grounding down lead current superposition theorem |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
