摘要
电磁式电压互感器(PT)被广泛地应用于供电系统,同时也是系统中必不可少的电气元件。当系统发生故障时,PT会由正常工作状态进入饱和状态发生铁磁谐振,而铁磁谐振过电压严重威胁着整个系统的稳定运行,因此合适的消谐措施在不同状态下的恰当使用,就显得至关重要了。本文首先由实测数据得到PT在空载状态时的伏安特性曲线,然后逐点递推得到对应的磁链电流特性曲线。通过分析铁磁谐振的产生机理,再结合多种影响铁磁谐振的因素,最后经电磁暂态仿真计算软件(ATP-EMTP)建立的系统仿真模型,对常用的几种消谐措施的适应性进行了比较分析。
Electromagnetic voltage transformers (PTs)are widely used in power supply systems and are also essential electrical components in systems.When a fault occurs in the system,the PT will undergo a ferromagnetic resonance from its normal operating state to a saturated state,and the ferromagnetic resonance over-voltage seriously threatens the stable operation of the entire system.Therefore,proper use of the harmonic elimination measures under different conditions is very important.This paper firstly obtains the volt-ampere characteristic curve of the PT in the no-load state from the measured data,and then recursively points to obtain the corresponding flux current characteristic curve.By analyzing the generation mechanism of the ferromagnetic resonance,combined with a variety of factors that affect the ferromagnetic resonance,the system simulation model was established by electromagnetic transient simulation software (ATP-EMTP)finally to compare and analysis several commonharmonic elimination measures.
出处
《变频器世界》
2018年第11期85-89,92,共6页
The World of Inverters
