| 引用本文: | 段振锋,付鹏武,吴佳芳,贺智,邹婞,周念成.基于耦合漏感的四绕组变压器暂态模型及短路计算[J].电力自动化设备,2018,(4): |
| DUAN Zhenfeng,FU Pengwu,WU Jiafang,HE Zhi,ZOU Xing,ZHOU Niancheng.Transient model and short circuit calculation of four-winding transformer based on coupling leakage inductance[J].Electric Power Automation Equipment,2018,(4): |
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| 摘要: |
| 为确保含四绕组变压器的变电站保护整定可靠性，需研究精细化的四绕组变压器暂态模型及其短路计算等值电路。分析常规变压器等值电路的不足，推导了修正的耦合漏感等值电路，根据三相三柱式四绕组变压器的拓扑结构，运用对偶性原理建立了基于耦合漏感的四绕组变压器电路磁路暂态模型；利用漏磁路的互阻抗远小于漏阻抗的特点，推导了用于短路计算的四绕组变压器简化等值电路以及零序阻抗。根据某地220 kV变电站实例进行仿真计算，结果表明所提出的四绕组变压器暂态模型及短路计算方法能够更准确地计算含四绕组变压器变电站的短路电流。 |
| 关键词: 四绕组变压器 耦合漏感 暂态模型 短路电流 计算 |
| DOI：10.16081/j.issn.1006-6047.2018.04.016 |
| 分类号:TM411+.2;TM714 |
| 基金项目:国家自然科学基金资助项目(51577018) |
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| Transient model and short circuit calculation of four-winding transformer based on coupling leakage inductance |
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DUAN Zhenfeng1, FU Pengwu1, WU Jiafang2, HE Zhi1, ZOU Xing1, ZHOU Niancheng2
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1.State Grid Loudi Power Supply Company, Loudi 417000, China;2.State Key Laboratory of Power TransmissionEquipment & System Security and New Technology, Chongqing University, Chongqing 400044, China
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| Abstract: |
| To ensure the protection setting reliability of substations containing four-winding transformer, it is necessary to study the detailed transient model of four-winding transformer and its equivalent circuit for short circuit calculation. The shortcomings of conventional transformer equivalent circuit are analyzed, and the equivalent circuit based on the improved coupling leakage inductance is deduced. According to the topological structure of three-phase three-column type four-winding transformer, the duality principle is employed to establish an electrical circuit and magnetic circuit transient model of four-winding transformer based on coupling leakage inductance. According to the characteristic that the mutual impedance of leakage magnetic circuit is far less than its leakage impedance, the simplified equivalent circuit and zero-sequence impedance of four-winding transformer for short circuit calculation is deduced. Taking a 220 kV substation as a simulation calculation example, the result shows that the proposed transient model and short circuit calculation method of four-winding transformer can accurately calculate short circuit current of the substation containing four-winding transformer. |
| Key words: four-winding transformer coupling leakage inductance transient model short circuit currents calculation |
