基于剩磁测量的选相关合技术  

Controlled Closing Technology Based on Remanence Measurement

作　　者：黄金[1] 梁兆庭[1] 

机构地区：[1]广西电网公司贺州供电局,广西贺州542800

出　　处：《低压电器》2011年第9期10-13,16,共5页Low Voltage Apparatus

摘　　要：由于空载合闸时变压器铁心存在剩磁并且断路器合闸相位角的随机性影响,铁心总磁通大幅增加,变压器进入饱和区运行,从而导致其绕组内产生幅值很大、谐波含量丰富的励磁涌流。励磁涌流容易造成继保装置误动作,影响电力系统的正常运行。为了解决这个问题,找到了通过测量铁心剩磁来寻找最佳合闸相角的选相关合技术来抑制励磁涌流。计算与仿真证明,选相关合技术能够很好地抑制变压器空载合闸时的励磁涌流。There were remanence and the randomness of phase angle when no-load closing in transformer,which makes the total flux core significantly increase and transformer go into saturation operation,resulting in inrush current of large amplitude and rich in harmonic content in transformer windings.Inrush current could cause malfunction of protection devices easily and affect the normal operation of power systems.To solve this problem,it was found a controlled closing technology by measuring the core remanence to find the best closing phase angle to suppress inrush current.The calculation and simulation results showed that the controlled closing technology could restrain inrush current effectively when no-load closing in transformer.

关 键 词：空载变压器 励磁涌流 选相关合 剩磁 

分 类 号：TP29[自动化与计算机技术—检测技术与自动化装置]