Communications: electrical – Continuously variable indicating – With meter reading
Patent
1991-11-07
1992-09-22
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
324 83D, 340658, H04B 300
Patent
active
051501112
ABSTRACT:
A method for detecting the presence or absence of an abnormality in a signal x having a frequency f from a signal source, is implemented by a circuit arrangement for deriving a now signal provided at the present time by the signal source, and for deriving a past signal at a point of time preceding the present time by an interval of time M/f where M is an integer. The circuit arrangement also detects an abnormality in the signal and/or the signal source compared to the new signal and to the past signal. The now signal x.sub.m is provided by the signal source at a point of. Another now-signal x.sup.'.sub.m is provided at a point of time preceding the now time t1 by t-1/4f. The signals Xm and xm are derived as a pair. A past signal x.sub.n corresponding to the signal x.sub.m and another past signal x'.sub.n corresponding to the signal x'.sub.m are also provided as a pair. The circuit arrangement also includes a calculating circuit which calculates ##EQU1## detecting the presence or absence of abnormality in the signal source and/or the signal depending on whether or not the phase difference .theta. between the now signal and the past signal is equal to 0.
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Denki Kyodo Kenkyu, vol. 41, No. 4, pp. 40-45 and a partial translation of the pertinent parts.
Fujieda Keishi
Kawamura Takeshi
Fasse W. G.
Kane, Jr. D. H.
Magistre Dervis
Sumitomo Electric Industries Ltd.
Yusko Donald J.
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