Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Electrical signal parameter measurement system
Patent
1997-03-05
1999-06-01
Wachsman, Hal Dodge
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Electrical signal parameter measurement system
702 66, 702 64, 36452827, 36452828, 36472603, 324522, 324 7621, 361160, 361 86, 361 87, G06F 1714
Patent
active
059096560
ABSTRACT:
A method for applying a modified Discrete Fourier Transform (DFT) in a protective relaying system involves five basic steps: The first step, S1, comprises measuring voltage and current time-domain samples v(k), i(k). The next step, S2, involves the computation of the DFT of the DC component(s) (V.sub.DC (k), I.sub.DC (k)) of the voltage and current samples. The next step, S3, comprises the computation of the regular DFT (V(k), I(k)). Next, in step S4, the modified DFTs are computed as, V.sub.m (k)=V(k)-V.sub.DC (k), and I.sub.m (k)=I(k)-I.sub.DC (k). In step S5 the modified DFT values representing the desired phasors are employed to carry out various protective relaying functions.
REFERENCES:
patent: 4587626 (1986-05-01), Gray
patent: 5172329 (1992-12-01), Rahman et al.
patent: 5406495 (1995-04-01), Hill
patent: 5453903 (1995-09-01), Chow
patent: 5592393 (1997-01-01), Yalla
patent: 5671112 (1997-09-01), Hu et al.
Lian, C.Z., "Direct Current Error Compensation of Fourier Method," 4th Protective Relaying and Automation Meeting of CIEE (Chinese Institution of Electrical Engineers), Oct. 1986. Chinese language copy and copy of English translation enclosed.
ABB Power T&D Company Inc.
Wachsman Hal Dodge
LandOfFree
Protective relay with improved DFT function does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Protective relay with improved DFT function, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Protective relay with improved DFT function will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-962344