GIS设备在中国电网建设中占据着重要位置,设备的安全运行至关重要。在高压设备发生短路故障时,通过设备导体与壳体的短路电流峰值高达171 k A,这对设备的动稳定性和热稳定性都提出了苛刻的要求。针对接地回路,热稳定性考核通过理论计算...GIS设备在中国电网建设中占据着重要位置,设备的安全运行至关重要。在高压设备发生短路故障时,通过设备导体与壳体的短路电流峰值高达171 k A,这对设备的动稳定性和热稳定性都提出了苛刻的要求。针对接地回路,热稳定性考核通过理论计算即可满足要求,但对于动稳定性分析,由于空间结构复杂,理论计算较为困难。文中以小型化550 kV GIS用接地开关的接地回路为研究对象,基于Ansys 16.1的电磁场与结构场进行耦合分析,由电磁场得出接地回路的电流密度与磁通密度分布,给出各部位电动力密度云图,再导入结构场,对接地回路导流排的受力进行强度校核,最终完成导流排结构的优化。通过研究,对比不同结构的仿真结果,分析结构差异,提出了优化设计方案,为高压GIS接地回路的结构改进设计提供了理论基础。展开更多
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...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。展开更多
To understand the vibration noise behaviors of amorphous metal alloy core distribution transformer(AMACDT), a 10 k VA prototype was tested under no-load and short-circuit conditions, respectively. The vibration charac...To understand the vibration noise behaviors of amorphous metal alloy core distribution transformer(AMACDT), a 10 k VA prototype was tested under no-load and short-circuit conditions, respectively. The vibration characteristics were described when rated voltage was applied to the secondary side, and the primary side was connected with different load resistances. The largest amplitude positions on the upper bracket and tank surfaces were recorded by vibration sensors arranged on the surface. A data-acquisition platform was set up for signal measurement. The vibration amplitude related to frequency was discussed, and experimental results indicated that the position with the largest amplitude accrued in the middle of the upper bracket and tank surface, at phases a and c, respectively. The experimental results suggest that magnetostrictive and electrodynamic forces play a major role in exciting the vibration noise. At the same time, some rib-reinforcements were welded on the upper bracket and tank surfaces to lessen the vibration energy, which reduced the noise.展开更多
文摘针对轴向并绕数为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。
基金Supported by the National Natural Science Foundation of China(No.51277131)the National Basic Research Program of China("973" Program,No.2014CB239501 and No.2014CB239506)
文摘To understand the vibration noise behaviors of amorphous metal alloy core distribution transformer(AMACDT), a 10 k VA prototype was tested under no-load and short-circuit conditions, respectively. The vibration characteristics were described when rated voltage was applied to the secondary side, and the primary side was connected with different load resistances. The largest amplitude positions on the upper bracket and tank surfaces were recorded by vibration sensors arranged on the surface. A data-acquisition platform was set up for signal measurement. The vibration amplitude related to frequency was discussed, and experimental results indicated that the position with the largest amplitude accrued in the middle of the upper bracket and tank surface, at phases a and c, respectively. The experimental results suggest that magnetostrictive and electrodynamic forces play a major role in exciting the vibration noise. At the same time, some rib-reinforcements were welded on the upper bracket and tank surfaces to lessen the vibration energy, which reduced the noise.
