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电网技术  2014 

晶闸管控制变压器式可控高抗本体保护方案

DOI: 10.13335/j.1000-3673.pst.2014.09.035, PP. 2538-2543

Keywords: 晶闸管控制变压器式可控并联电抗器,本体保护配置,控制绕组保护,保护性能分析

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Abstract:

基于晶闸管控制变压器(thysistorcontrolledtransformer，TCT)式可控高抗的本体结构和工作原理，对TCT式可控高抗本体保护配置进行了探讨，包括网侧绕组保护、控制绕组保护以及补偿绕组保护。重点对控制绕组保护进行了研究，分析了控制绕组各类故障的故障特征，结合数字仿真结果，指出了传统电抗器保护应用于TCT式可控高抗控制绕组在应对控制绕组引线单相接地故障、匝间故障和阀短路故障时存在可靠性或灵敏性不足的问题。针对上述问题提出将控制绕组侧电流互感器移至晶闸管阀末端并增设零、负序电流保护。

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