同步电动机的失磁保护  

Loss Excitation Protection for Synchronous Motor

作　　者：李宁[1] 李丰顺 

机构地区：[1]天津科技大学电子信息与自动化学院,天津300191 [2]山西霍州煤电集团公司煤矸石热电厂,山西霍州031412

出　　处：《煤矿机电》2010年第3期66-69,共4页Colliery Mechanical & Electrical Technology

摘　　要：我国目前绝大部分同步电动机所装设的失步保护仍与30年前相同,一般采用具有反时限特性的过电流继电器作为短路、过负荷保护,并兼作同步电动机的失步保护。该保护既不能可靠地保证同步电动机在各种失步状态下的安全运行,又不能对断电失步引起的非同期冲击起到保护作用,更不能使同步电动机在保障安全的前提下,保持连续运行。在对同步电动机失磁失步的危害性及同步电动机失磁后的运行特性进行了认真的分析之后,提出用同步电动机功率因数角和静稳边界阻抗圆作为同步电动机失磁保护的整定边界,并已通过了Matlab的仿真验证。In the vast majority of China＇s current synchronous motors,are still equipped with the loss of synchronization protection as the same as 30 years ago,commonly use the over-current relay with the characteristics of inverse-time as the short-circuit and over-load protections,and doubles as the loss of synchronization protection for synchronous motor. The protection cannot guarantee synchronous motor＇s working safety under the conditions in variety of loss synchronizations,also cannot provide the fundamental protection for the non-simultaneous impact caused by the loss synchronization of power-off,furthermore,cannot keep the working continuity of synchronous motors under the premise of safety to maintain continuous operation. After the careful analysis on the harmfulness of the loss of excitation and the loss of synchronization to synchronous motor,and the operating characteristics after the loss excitation of synchronous motor,proposes to use synchronous motors＇power factor angle and static impedance circle as the setting boundaries to the loss excitation protection of synchronous motor,and it has proved by Matlab simulation.

关 键 词：同步电动机 失步保护 失磁保护 静稳边界阻抗圆 

分 类 号：TM341[电气工程—电机]