摘要
空载变压器合闸过程中,当铁芯磁通趋于饱和时,会产生幅值相当大的励磁涌流。这将造成很多不利影响,容易引起继电保护装置误动、绕组机械应力增大及电能质量降低等。如果利用相关的运算法则对铁芯通量和剩磁进行计算,选择关合相位角进行合闸可以消除这些暂态影响。通过MATLAB仿真分析,证明利用选相位角关合技术,可以消除投空载变压器时的励磁涌流。
High-magnitude inrush currents generate when no-load transformer cores are driven into saturation during energization. These currents have undesirable effect, including protective relay misoperation, imposed sever mechanical stresses on the transformer windings and the decline of power quality. Controlled transformer switching can potentially eliminate these transients if residual core and core flux transients are taken into account in the closing algorithm. The simulations by MATLAB prove that the technology by controlling switching can eliminate the inrush currents when energizing no-load transformer.
出处
《电气开关》
2007年第3期22-25,共4页
Electric Switchgear
