带并联电抗器同杆双回线自适应重合闸方案

Adaptive Reclosure Scheme for Parallel Lines with Shunt Reactors

提出了一种针对带并联电抗器的同杆双回线的自适应重合闸方案。针对接地故障类型,利用故障相恢复电压的积分值进行故障性质的判断;针对跨线不接地故障类型,利用不同回线故障相恢复电压差的积分值进行故障性质的判断;针对同杆双回线的所有故障类型,根据按相顺序重合闸原则进行重合闸操作。大量的动模实验结果表明,该方案能够准确识别各类接地与跨线不接地永久性故障,缩短了瞬时性故障时的重合闸时间,提高了系统的安全稳定水平,并且在不同电力系统运行状况和不同故障类型下重合闸装置均能正确动作,满足相关的技术要求。

A new scheme of adaptive reclosure for parallel lines with shunt reactors is presented.For different types of ground fault,the integration of fault-phase”s recovery voltage is used for identifying permanent grounded fault.For the type of cross-line ungrounded fault,the integration of the difference of fault-phase”s recovery voltage is used for identifying the permanent cross-line ungrounded fault.The phase reclosure sequence principle is used for all the fault types.Numerous dynamic simulations have proved the scheme”s capability of accurately identifying all grounded permanent faults and cross-line ungrounded permanent faults thus reducing the reclosure time for temporary faults and improving the system security and stability level.Besides,the protective devices act correctly in different system operation states and different fault types, meeting the relevant technical requirements.