摘要
针对轴向并绕数为1的35 k V/2 330 kvar空心并联电抗器,采用场-路耦合法进行计算,对比分析了不同位置发生匝间短路故障对电抗器短路电流、磁场分布和电动力的影响规律。计算结果表明:匝间短路使得短路匝的短路电流增大了数百倍,极易引起电抗器烧毁;随着短路位置向中心高度、电抗器外层靠近,短路电流逐渐增大;匝间短路故障使电抗器磁场产生畸变,不再沿高度方向上下对称分布,且随匝间短路位置向电抗器外层、中心高度靠近,磁场畸变程度增大;在同一层线圈内,匝间短路位置越靠近中心高度,短路匝所受到的径向电动力越大,轴向电动力越小,当中心高度处短路时,轴向电动力为0;随着匝间短路位置向电抗器外层靠近,短路匝受到的轴向电动力逐渐增大。
In allusion to the 35 kV/2 330 kvar air paralleled reactor with axial paralleled winding number of one,the paper adopts the method of electromagnetic field-circuit coupling for calculation,and compares and analyzes influencing laws of turn-to-turn short circuit faults in different positions on short circuit current,magnetic field distribution and electrodynamic force of the reactor. Calculation results indicate turn-to-turn short circuit has made short circuit currents of turns increase hundreds of times,which may cause burn-out of the reactor easily,and as position of the short circuit fault approaches to the middle height and outer layer of the reactor,short circuit current increases gradually. Turn-to-turn short circuit fault has resulted in distortion of magnetic field of the reactor which will not distribute symmetrically along the height direction,and as position of the short circuit fault approaches to the middle height and outer layer of the reactor,distortion of magnetic field increases. In the same coil,as position of the short circuit fault approaches to the middle height,radial electrodynamic force of short circuit turns is larger while axial electrodynamic force is smaller.When short circuit fault happens in the position of middle height,the axial electrodynamic force is zero. As position of turn-to-turn short circuit fault approaches to the outer layer of the reactor,the axial electrodynamic force of short circuit turns gradually increases.
出处
《广东电力》
2018年第1期119-126,共8页
Guangdong Electric Power
关键词
空心电抗器
匝间短路
短路电流
电动力
磁场分布
场-路耦合
air reactor
turn-to-turn short circuit
short circuit current
electrodynamic force
magnetic field distribution
electromagnetic field-circuit coupling method
