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Title:
PHASE/AMPLITUDE DETECTOR, AND METHOD
Document Type and Number:
Japanese Patent JP2006317435
Kind Code:
A
Abstract:

To provide a phase/amplitude detector capable of detecting a phase and/or an amplitude of an AC electric quantity within one cycle of the AC electric quantity.

The AC electric quantity is read by an input part 11 at predetermined sampling intervals, and time-series data of the AC electric quantity read by the input part 11 is stored in a time-series data storage part 12. When data of a half cycle of the AC electric quantity is obtained, a double speed discrete Fourier transform means 17 changes the sign of the time-series data for the half cycle of the AC electric quantity to obtain the time-series data for the remaining half cycle to create the time-series data for one cycle of the AC electric quantity. Then it is Fourier-transformed to obtain a Fourier transform signal. A phase/amplitude calculation means 14 calculates the phase and/or the amplitude of the AC electric quantity based on the Fourier transform signal obtained by the means 17.


Inventors:
TANAKA SHUNSUKE
Application Number:
JP2006110169A
Publication Date:
November 24, 2006
Filing Date:
April 12, 2006
Export Citation:
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Assignee:
TOKYO ELECTRIC POWER CO
International Classes:
G01R25/00; G01R19/00; G01R23/16
Domestic Patent References:
JPH07255131A1995-10-03
JP2003344463A2003-12-03
JPH07255131A1995-10-03
JP2004138634A2004-05-13
JP2002196067A2002-07-10
JPS63119745A1988-05-24
Attorney, Agent or Firm:
Mitani Megumi