| 引用本文: | 戴魏,郑玉平,白亮亮,等.保护用电流互感器传变特性分析[J].电力系统保护与控制,2017,45(19):46-54.[点击复制] |
| DAI Wei,ZHENG Yuping,BAI Liangliang,et al.Analysis of protective current transformer transient response[J].Power System Protection and Control,2017,45(19):46-54[点击复制] |
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| 摘要: |
| 电流互感器(CT)是继电保护的数据源头。随着电网建设的发展，各种不同类型CT混联接入继电保护装置的情况越来越多，对继电保护适应性提出了新的课题。针对这一问题，从单个CT的传变特性分析着手，首先分析了P级和TPY级电磁型CT的传变特性，指出了影响电磁型CT传变特性的主要因素。推导并建立了TPY型CT等值电路模型，从理论上解释了TPY级CT剩磁较低的原因。同时，采用Jiles-Atherton磁滞回线理论，对TPY级CT进行了仿真，并分析了TPY级和P级CT暂态传变特性的差异。研究并得出了电磁型CT暂态饱和的特征和规律。推导了罗氏线圈型电子式CT完整的传变公式，从数学上指出了其与电磁型CT传变特性的一致性。最后，在此基础上，综合分析了三种CT传变特性差异及对继电保护的影响。 |
| 关键词: TPY级电流互感器 电子式电流互感器 罗氏线圈 磁滞回线 剩磁 差动保护 |
| DOI：10.7667/PSPC161579 |
| 投稿时间：2016-09-22修订日期：2016-12-20 |
| 基金项目:国家电网公司科技项目资助“提升数据源差异及数据异常情况下保护设备可靠性关键技术研究”(合同号DW1600017) |
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| Analysis of protective current transformer transient response |
| DAI Wei,ZHENG Yuping,BAI Liangliang,ZOU Zhiyang,PAN Shuyan,WU Chonghao |
| (State Key Laboratory of Smart Grid Protection and Control NARI Technology CO., LTD, Nanjing 211000, China) |
| Abstract: |
| The current transformer (CT) is the data source of relay protection. With the development of grid, a new topic is presented due to various class CT connected to relay protection. To solve this problem, the transfer characteristics of P and TPY class CT are analyzed firstly and the main affecting factors are pointed out in this paper. Then the reason of low remanence is explained theoretically based on equivalent circuit model of TPY class CT and the numerical simulation for which is carried out using Jiles-Atherton theory of ferromagnetic hysteresis. The characteristics and laws during a saturated condition are described. Formulas are developed for estimating the transient response of Rogowski coil CT, which show the consistency with P and TPY class CT. Finally, the transient response of three types CT is compared and its effect on relay performance is discussed. |
| Key words: TPY CT ECT Rogowski coil hysteresis loop remanent flus differential protection |
