Title:
DIGITAL PROCESSOR FOR QUANTITY OF ALTERNATING-CURRENT ELECTRICITY
Document Type and Number:
Japanese Patent JPS5851315
Kind Code:
A
Abstract:
PURPOSE:To perform digital processing which does not exert much influence upon variation in system frequency by obtaining a prescribed odd number of sampled values of the quantity of electricity or more and finding their sum of squares, and utilizing the mean value. CONSTITUTION:An even number of >=4 sampled values of the quantity of electricity of a system at intervals of time which is one-fourth as long as cycles for a rated frequency, and the mean value of the sum of squares of those sampled values is found. Namely, an AC input value (i) is passed through an analog filter 1 for a countermeasure to a return error and then sampled by a sample holding circuit 2 at prescribed cycles. Then, the obtained value is converted by an analog-digital converter 3 into a digital value, which is inputted to the input circuit 4 of a computer. Then, this digital information is used to perform arithmetic processing circuit 5, and the result is outputted through the output circuit 6. A control circuit 7 is a circuit for controlling respective circuits.
Inventors:
KOBAYASHI TOMOAKI
KAWAKATSU ZENJI
YOKOTA HIROSHI
MAEDA KOUJI
SUZUKI MAKOTO
KAWAKATSU ZENJI
YOKOTA HIROSHI
MAEDA KOUJI
SUZUKI MAKOTO
Application Number:
JP14991381A
Publication Date:
March 26, 1983
Filing Date:
September 22, 1981
Export Citation:
Assignee:
KANSAI ELECTRIC POWER CO
MITSUBISHI ELECTRIC CORP
MITSUBISHI ELECTRIC CORP
International Classes:
G05F1/12; G01R19/25; (IPC1-7): G05F1/12
Attorney, Agent or Firm:
Shinichi Kusano