A new method for measuring power system frequency

被引：8
|
作者：
Sezi, T [1 ]
机构：
[1] Siemens Power Transmiss & Distribut LLC, Distribut Automat Div, Raleigh, NC 27626 USA
来源：
1999 IEEE TRANSMISSION AND DISTRIBUTION CONFERENCE, VOLS 1 & 2 | 1999年
关键词：
frequency; frequency measurement; generator protection; power distribution protection; power system protection; power transformer protection; power transmission protection; protection; protective relaying;
D O I：
10.1109/TDC.1999.755385
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
The algorithms of numerical protective relays are very sensitive to variations in the power system frequency during operation. Even slight changes of the power frequency can lead to large calculation errors in the values for impedances, the power factor, etc. Implementing an adaptive sampling rate requires knowing the actual system frequency at all times with high accuracy. A new frequency measurement method has been successfully implemented. Since the method is not dependent upon zero-crossings of the measured current, it can calculate the frequency after every sample. In addition, the necessary signal-window is approximately 3 cycles, which means that the calculation is faster than all classical methods. The new method has made possible the development of a full-featured generator protection relay that can operate over a frequency range of 15Hz-70Hz. The accuracy of the Frequency calculation is better then 10mHz for a nominal frequency of 60Hz.
引用
收藏
页码：400 / 405
页数：6
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