Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Analysis of complex waves
Patent
1994-03-22
1996-06-04
Wieder, Kenneth A.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Analysis of complex waves
324 7639, 364484, G01R 2315
Patent
active
055236758
ABSTRACT:
A frequency detecting method for detecting a frequency of an AC electric parameter of an electric power system. The frequency detecting method comprises a sampling step of sampling the AC electric parameter of the electric power system at a predetermined sampling period, an adding step of adding a sampling value v.sub.m sampled at a sampling time m and a sampling value v.sub.m-n sampled at a sampling time (m-n), thereby obtaining a sum w.sub.m of the sampling values, a first RMS value calculating step of calculating a first electric parameter E1 corresponding to a RMS value of the sum w.sub.m, a second RMS value calculating step of calculating a second electric parameter E2 corresponding to a RMS value of a time-differential value u.sub.m of the sum w.sub.m, a dividing step of dividing the second electric parameter E2 by the first electric parameter E1, and a frequency detecting step of detecting the frequency of the AC electric parameter from a division result (E2/E1).
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Brown Glenn W.
Kabushiki Kaisha Toshiba
Wieder Kenneth A.
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