| 引用本文: | 李雷,罗容波,王岩,傅正财.基于10 kV配电网PT频繁故障的仿真与改进措施研究[J].电力系统保护与控制,2014,42(14):132-137.[点击复制] |
| LI Lei,LUO Rong-bo,WANG Yan,FU Zheng-cai.Simulation analysis and improved measures for preventing potential transformer faultin 10 kV distribution networks[J].Power System Protection and Control,2014,42(14):132-137[点击复制] |
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| 摘要: |
| 为了准确分析10kV母线并列电压互感器（PT）熔断器频繁熔断的原因，以某地区110kV变电站为例，首先对其PT频繁故障原因进行分析，然后根据该站的实际参数，利用ATP/EMTP仿真软件进行了模型仿真研究。分析表明，电网线路对地电容放电产生的暂态冲击电流是导致该变电站熔断器发热，从而引起母线PT频繁故障的直接原因，同时发现三组并列PT励磁特性不同引起暂态冲击电流分布不均亦是熔断器熔断的重要原因。基于此，提出在PT中性点加装消谐器或改用4PT接线方式等改进措施。仿真结果表明，上述措施对限制单个PT的暂态冲击电 |
| 关键词: 配电网 电压互感器 熔断器 故障仿真 暂态电流 |
| DOI：10.7667/j.issn.1674-3415.2014.14.022 |
| 投稿时间：2013-10-13修订日期：2013-12-02 |
| 基金项目: |
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| Simulation analysis and improved measures for preventing potential transformer faultin 10 kV distribution networks |
| LI Lei,LUO Rong-bo,WANG Yan,FU Zheng-cai |
| (Foshan Power Supply Bureau of Guangdong Power Grid Company, Foshan 528000, China;Key Laboratory of Control of Power Transmission and Conversion, Ministry of Education, Department of
Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China) |
| Abstract: |
| To analyze the reason why the 10 kV potential transformer (PT) frequently fused, taking a 110 kV transformer substation for example, it summarizes the theories firstly. Then, simulation of a power system model is performed according to the actual parameters of this substation using the ATP / EMTP simulation software. It concludes that the transient inrush current caused by ground capacitor discharge is a direct reason for frequent fault of the 10 kV PT. Also, the unbalanced distribution of the inrush current caused by different excitation characteristics of PTs, is an important reason for its fuse. Based on this case, it proposes several improvements such as installing resonance eliminator in the neutral points of PT, or switching to 4PT wiring. The simulation shows great improvement on limiting the transient inrush current of a single PT. But when several PTs are paralleled, the condition of each PT should be accounted in order to eliminate any possibility of PT being fused by overcurrent. |
| Key words: distribution network voltage transformer fuse fault simulation transient current |
