![一种改进的三次谐波定子接地比率判据](/CN/2017/1/196/images/201710981354.jpg)
基本信息:
- 专利标题: 一种改进的三次谐波定子接地比率判据
- 专利标题(英):Improved third harmonic stator grounding ratio
- 申请号:CN201710981354.2 申请日:2017-10-20
- 公开(公告)号:CN107887886A 公开(公告)日:2018-04-06
- 发明人: 郑作伟 , 李志坚 , 潘书燕 , 吴崇昊 , 揭萍 , 郝后堂 , 谭凌 , 王焕凤 , 沈莹 , 毛俊喜 , 曾炳文 , 万洛飞 , 李蔚 , 杨平怡
- 申请人: 国电南瑞科技股份有限公司
- 申请人地址: 江苏省南京市江宁区诚信大道19号
- 专利权人: 国电南瑞科技股份有限公司
- 当前专利权人: 国电南瑞科技股份有限公司
- 当前专利权人地址: 江苏省南京市江宁区诚信大道19号
- 代理机构: 南京纵横知识产权代理有限公司
- 代理人: 董建林
- 主分类号: H02H7/06
- IPC分类号: H02H7/06 ; H02H1/00
The invention discloses improved third harmonic stator grounding ratio criteria. A third harmonic extraction method in the criteria is implemented through taking 10Hz as a fundamental wave and extracting a 150Hz component. Through the method, a 20Hz injection source serves as the second harmonic of 10Hz and is completely filtered. The extraction of a 150Hz component is not affected by a 20Hz component, and the150Hz component can be precisely extracted. In the criteria, when the 150Hz component of a neutral point is less than 0.2V, the criteria can achieve the correct distinguishing of PT linebreakage of the neutral point and a low-resistance grounding fault nearby the neutral point if no latch-up protection is carried out when the abrupt change of the 150Hz component of a machine end is greater than 0.2V.
公开/授权文献:
- CN107887886B 一种改进的三次谐波定子接地比率判据 公开/授权日:2019-02-26
IPC结构图谱:
H | 电学 |
--H02 | 发电、变电或配电 |
----H02H | 紧急保护电路装置 |
------H02H7/00 | 当出现正常工作条件的不希望有的变化时能完成自动切换的,专用于特种电机或电设备的或专用于电缆或线路系统分段保护的紧急保护电路装置 |
--------H02H7/06 | .用于发电机;用于同步电容器 |