CAJ | 학술논문

提出了20 Hz自适应新原理低电阻型定子接地保护,其整定值不是常数,能自适应地跟随单相接地点位置的变化而变化,无论发电机定子单相接地点位于何处,只要接地电流大于允许安全电流,新保护出口都能快速动作,克服了传统保护的缺点,显著提高了发电机运行的安全性.分析了一些关键技术,如接地点零序电势的计算方法、动作联立各方程之间的关联,以及动作联立方程中不包含接地点位置α参数而为何α对保护特性有重大影响等问题.
제출료20 Hz자괄응신원리저전조형정자접지보호,기정정치불시상수,능자괄응지근수단상접지점위치적변화이변화,무론발전궤정자단상접지점위우하처,지요접지전류대우윤허안전전류,신보호출구도능쾌속동작,극복료전통보호적결점,현저제고료발전궤운행적안전성.분석료일사관건기술,여접지점령서전세적계산방법、동작련립각방정지간적관련,이급동작련립방정중불포함접지점위치α삼수이위하α대보호특성유중대영향등문제.
The setting value of self-adaptive 20 Hz generator stator ground fault protection proposed in this paper can automatically vary with different grounding positions. Regardless of the grounding positions, it can ensure that the protection will quickly operate when the grounding current is greater than the allowed safety value. This new scheme can overcome the defects of traditional protection and remarkably improve the operation security of generators. Some key technologies are analyzed in detail, such as the calculation method of zero-sequence potential at the grounding point, the association between operation equations, the analysis of why the grounding point parameter α has significant influence on protection characteristics while not appearing in the operation equations.