Out-of step and single phasing protection of synchronous chipper motors

J. Das, Jon D. Steinmetz, Clifton D. Engram, Aaron A. McPhee
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引用次数: 2

Abstract

Chipper motors in pulp and paper mill environment are of special design-the stability on impact loads is one important consideration. The power factor under normal operation will continuously swing due to varying loads. The paper describes guesswork free rigorous calculations of pull out (out-of-step) power factor based on the parameter of an actual installation. Single phasing is rather a rare occurrence; however, such an event has been experienced in an installation due to overheating and arcing at the fuse clips in a NEMA E2 starter of a chipper motor. Discussions on single phase protection of synchronous motors and recommended settings are provided.
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同步切屑电机的失步和单相保护
制浆造纸厂环境中的切屑电机具有特殊的设计,其在冲击载荷下的稳定性是一个重要的考虑因素。正常工作时的功率因数会随着负载的变化而不断摆动。本文介绍了基于实际安装参数的无猜测(不同步)功率因数的严格计算。单相相当罕见;然而,在安装过程中,由于切屑电机的NEMA E2启动器中的保险丝夹过热和电弧而发生过此类事件。对同步电动机单相保护进行了讨论,并给出了建议设置。
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