Sampling frequency control method and protective relay

Details Sampling frequency control method and protective relay Sampling frequency control method and protective relay

2007-10-25

2010-06-22

Lau, Tung S (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Electrical signal parameter measurement system

Reexamination Certificate

active

07742884

ABSTRACT:
A sampling frequency control method includes a difference calculating step ST1of calculating the difference between sampled values obtained through sampling of an AC quantity of electricity of a power system at time points that are separated by a prescribed time period of the AC quantity of electricity; an effective value calculating step ST2of calculating an effective value of the AC quantity of electricity and an effective value of the difference; a ratio calculating step ST3of calculating the ratio K of the effective value of the difference to the effective value of the AC quantity of electricity; and a control step of controlling the sampling frequency by controlling the sampling period on the basis of the calculated ratio K so that it follows the frequency of the AC quantity of electricity.

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