发明授权
- 专利标题： Method and device for monitoring power supply networks
- 专利标题（中）： 监控供电网络的方法和装置
-
申请号： US793423申请日： 1997-04-30
-
公开(公告)号： US5966675A公开(公告)日： 1999-10-12
- 发明人: Gerd Koeck
- 申请人： Gerd Koeck
- 申请人地址： DEX Munich
- 专利权人： Siemens Aktiengesellschaft
- 当前专利权人： Siemens Aktiengesellschaft
- 当前专利权人地址： DEX Munich
- 优先权： DEX4430246 19940825
- 主分类号： G01R23/16
- IPC分类号： G01R23/16 ; G01R19/25 ; G01R31/00 ; G01R31/08 ; G08C19/00 ; H02J13/00 ; H04Q9/00 ; G06F17/14
摘要：
Spectral values are calculated from sampling values of the network voltage or current using the discrete Fourier transformation. Of these values, only those that are greater than a predefined threshold value (SW) are transmitted or stored. The missing spectral values are assumed to be equal to zero to reconstruct the sampling values. In general only those spectral values are transmitted or stored that pertain to a fault and its previous and subsequent history of a few seconds.
公开/授权文献
- US4175579A Device for automatic, selective watering of plants 公开/授权日：1979-11-27
信息查询
