摘要
由于配网线路装有大量的配电变压器,在线路投运合闸瞬间,各变压器所产生的励磁涌流在线路上相互叠加,来回反射,产生了一个复杂的电磁暂态过程,在系统阻抗较小时,会出现较大的涌流,时间常数也较大,造成线路投运瞬间电流速断保护误动。笔者针对这类跳闸事故进行研究,对发生励磁涌流跳闸时的相关数据和录波波形进行分析研究,开发了一种基于数字陷波器的波形处理算法,对保护软件进行改进,实现抑制配电网励磁涌流跳闸的目的。且经过试验验证,证明该方法可以有效地抑制涌流跳闸事故。
Because of distribution network are fitted with plenty of distribution transformers, switch instant, all magnetizing inrush current of transformers are superposition to form a complicated magnetic transient process. On the time of system resistance reduced and time constant increased, magnetizing inrush current will become a larger to cause protection malfunction. The related data and recorded waveforms in magnetizing inrush current tripping are introduced in this paper. For interference suppression of magnetizing inrush current, a new method which is based on a notch filter is presented. The test results show that the method above-mentioned can suppress the inrush current triooing accidents effectively.
出处
《高压电器》
CAS
CSCD
北大核心
2013年第12期59-63,68,共6页
High Voltage Apparatus
关键词
励磁涌流
二次谐波
电流速断保护
数字陷波器
magnetizing inrush current
second harmonic
current quick-break protection
digital notch filter
