基于零序分量的风电场多分支集电线路故障诊断技术
Zero-sequence-component-based Fault Diagnosis of Multi-branch Collector Lines in Wind Farms
朱振军1
作者信息
- 1. 五凌电力有限公司,湖南 长沙 410000
- 折叠
摘要
风电场Z型变压器绕组的特殊接线方式,使得 35kV 集电线路发生接地故障时会产生一个唯一的零序电流回路.为此,以集电线路中存在的零序分量为论述点,提出一种利用零序电流回路的系数值判定故障区间的方法,可避免接地阻抗和线路零序电容对诊断过程的影响,再通过监测零序电流行波,基于单/双端行波定位原理,实现接地故障点的精确定位.该故障诊断方法不受接地电阻及故障距离的影响,应用于多分支集电线路的故障诊断,效果良好并可节省建设成本.
Abstract
Due to special winding wiring mode of wind farm Z-type transformers,a unique zero-sequence current circuit will be formed when 35 kV collector lines encounter grounding faults.In view of this,from the perspective of zero sequence components in collector lines,the present work studied a scheme of determining fault interval using coefficient values of the zero-sequence current circuit,which can avoid the impact of grounding impedance and zero sequence capacitance on diagnosis process.And the accurate fault point determining method was thereby realized by monitoring zero sequence current traveling wave and utilizing the principle of uni-/bi-terminal traveling wave location.The proposed method is effective regardless of grounding resistance and fault distance,and can save equipment cost in coping with faults in multi-branch collector lines.
关键词
Z型变压器/零序分量/多分支/故障诊断Key words
Z-type transformer/zero sequence component/multi-branch/fault diagnosis引用本文复制引用
出版年
2024
NETL
NSTL
万方数据