学术论文

      PT断线后电抗器匝间保护新判据

      New Criterion on Shunt Reactor Inter-turn Protection When PT Secondary Circuit Open

      摘要:
      电抗器在电压互感器(potential transformer,PT)断线后均采取闭锁匝间保护的策略,容易造成故障范围的扩大.该文分析电抗器PT断线时零序阻抗计算的方法,研究电抗器区外故障和匝间故障时首末端故障电流的特点;在此基础上提出基于零序阻抗和故障电流特征的PT断线后电抗器匝间保护新判据,并在PSCAD/EMTDC电磁暂态仿真平台上验证理论分析的正确性.该判据完善了现有电抗器保护方法.最后在动模实验室建立线路电抗器系统模型,动模仿真结果验证了理论分析计算的正确性.
      Abstract:
      The strategy of blocking inter-turn protection is adopted when potential transformer (PT) secondary circuit is open, but it can expand the failure range easily. This paper analyzed the calculation method of zero sequence impedance when reactor PT secondary circuit open, characteristics of initial and terminal current was studied after inter-turn fault and external fault at the reactor, new criterion about shunt reactor inter-turn protection when PT secondary circuit open was proposed on the basis of zero sequence impedance and fault current characteristic, the correctness of the theoretical analysis was verified in PSCAD/EMTDC electromagnetic transient simulation platform, this criterion improves the existing reactor protection methods. Reactor and line system model was established in the dynamic simulation lab, dynamic simulations results verified the validity of the theoretical analysis and calculation.
      作者单位: 中国电力科学研究院,北京市海淀区,100192
      刊 名: 中国电机工程学报 ISTICEIPKU
      年,卷(期): 2015, 35(24)
      分类号: TM77
      在线出版日期: 2016年2月25日