同步发电机转子匝间短路故障在线监测的研究评述与展望

Review and prospect of online rotor inter-turn short circuit monitoring for synchronous generator

目前转子匝间短路故障在线监测主要有基于磁场探测的故障监测法、冲击脉冲法、轴电压监测法、电气量监测法和机组振动特性监测法,对这几种方法的原理进行了阐述和评价。从故障的数学建模、故障特征及其机理、基于定子相绕组内部不平衡电流有效值的故障监测方案3个方面说明了电气量监测法的相关研究进展,从无死区灵敏监测、不具备分支电流互感器安装条件发电机的故障监测、故障在线定位3个方面对转子匝间短路故障在线监测技术的研究进行展望,并给出了初步思路。

The principles of five online rotor inter-turn short circuit monitoring methods are introduced and evaluated：fault monitoring based on magnetic field measurement,shock pulse,shaft voltage monitoring, electrical parameter monitoring and unit vibration monitoring. The research progress of electrical parameter monitoring method is introduced in three aspects：the fault mathematical modeling,the fault characteristic and mechanism and the fault monitoring based on the internal unbalanced current of stator phase windings. The researches of online rotor inter-turn short circuit monitoring techniques are prospected from three aspects ：the sensitive monitoring without dead-zone,the fault monitoring of generator unequipped with branch current transformer and the online fault location,and some preliminary concepts are given.