Method for canceling transient errors in unsynchronized...

Details Method for canceling transient errors in unsynchronized... Method for canceling transient errors in unsynchronized...

2005-07-05

2005-07-05

Barlow, John (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Electrical signal parameter measurement system

Reexamination Certificate

active

06915219

ABSTRACT:
A method for determining transient errors in an unsynchronized, digital current differential transmission line protection system includes receiving a first current phasor measurement at a time, t, and receiving a second current phasor measurement at time t. The second current phasor is adjusted so as to account for a determined offset between a first sampling clock associated with the first current phasor measurement and a second sampling clock associated with the second current phasor measurement, thereby resulting in a rotated second current phasor measurement. A residual transient error is then obtained from the rotated second current phasor measurement and the first current phasor measurement.

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Line Current Differential, Distance, Out-of-Step, Overcurrent, Voltage, Synchronism Check, and Frequency Elements, SEL-311L/SEL-311L-6 Instruction Manual, Section 3, Jul. 3, 2002; p. 3-1-3-91.

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