| 利用基波幅值变化特征快速识别励磁涌流和故障电流 |
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| 引用本文： | 马静,王增平,吴颉.利用基波幅值变化特征快速识别励磁涌流和故障电流[J].电工技术学报,2009,24(6). |
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| 作者姓名： | 马静 王增平 吴颉 |
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| 作者单位： | 1. 华北电力大学电力系统保护与动态安全监控教育部重点实验室,北京,102206
2. 浙江省电力设计院,杭州,310014 |
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| 基金项目： | 国家自然科学基金(50777016);;长江学者和创新团队发展计划(IRT0515);;华北电力大学校博基金(200822002)资助项目 |
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| 摘 要： | 提出了一种基于两采样值积算法快速提取基波幅值变化特征的变压器保护新原理。文中首先介绍了两采样值积算法,分析了励磁涌流和内部故障情况下,基波幅值不同的变化趋势。在此基础上,根据基波幅值下降程度的不同区分励磁涌流和故障电流。新原理计算量小,易于工程实现。动模试验表明,该原理能够在一个周波内快速切除变压器内部故障,识别灵敏度高,不受电流互感器饱和的影响,在性能上优于谐波制动判据和波形比较判据。
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| 关 键 词： | 变压器保护 两采样值积算法 基波幅值 励磁涌流 内部故障 |
A Novel Method to Rapidly Identify Inrush Current and Internal Fault Current Based on Variation Characteristic of Fundamental Current Amplitude |
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| Ma Jing,Wang Zengping,Wu Jie.A Novel Method to Rapidly Identify Inrush Current and Internal Fault Current Based on Variation Characteristic of Fundamental Current Amplitude[J].Transactions of China Electrotechnical Society,2009,24(6). |
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| Authors: | Ma Jing Wang Zengping Wu Jie |
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| Affiliation: | 1. Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Under Ministry of Education North China Electric Power University Beijing 102206 China 2. Zhejiang Electric Power Design Institute Hangzhou 310014 China |
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| Abstract: | A new transformer protection principle based on two-instantaneous-value-product algorithm to extract the feature of fundamental current amplitude is put forward in this paper. First, the algorithm of two-instantaneous-value-product is developed, and variation trends of fundamental current amplitudes are analyzed in the case of inrush currents and internal fault currents. Whether the fundamental current amplitude reveals the descending feature or not can be used to distinguish the inrush current and the inte... |
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| Keywords: | Transformer protection two-instantaneous-value-product algorithm fundamental current amplitude inrush current internal fault |
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