摘要
提出了一种基于有功功率和功率因数特征的变压器励磁涌流鉴别方法。分析了励磁涌流和内部故障情况下,有功和功率因数不同的变化趋势。有功功率发生空投于故障时,由于故障支路的存在,有功功率和功率因数较发生励磁涌流时都大,且功率因数在判断轻微故障时可弥补有功功率的不足。利用两个量构成判据,判断是否发生故障。方法易于实现,计算量小,动作可靠、迅速。利用变压器各种运行状态的动模实验数据进行验证,结果表明该方法不受励磁涌流的影响且能够迅速、可靠地反映变压器内部故障,在性能上优于谐波制动判据。
This paper presents a new strategy based on active and power actor to identify transformer inrush current.This paper analyzes the different active power and power actor changes in the magnetizing inrush and internal fault conditions.When the transformer switches on a non-load transformer in a state of internal fault,due to the presence of fault slip,active power and power actor are greater than the ones when the transformer switches on a non-load transformer;and power factor in determining the minor faults can make up for lack of active power for judging the fault.By using these,this strategy not only could quickly determines whether the transformer internal fault occurred,but also is easy to implement and compute.The results of dynamic analog testing confirmed that the strategy was not affected by inrush current and could quickly and reliably reflect the transformer internal fault,the performance was better than the strategy based on harmonic restraint.
出处
《电力科学与工程》
2011年第2期22-24,40,共4页
Electric Power Science and Engineering
关键词
变压器
励磁涌流
有功功率
功率因数
power transformer
inrush current
active power
power actor
