Patent ID: 7620517
Filing Date: 2009-11-17
Classification: H02G

Abstract:
1. A computer-implemented method comprising the following computer-executable acts: receiving a conductor temperature of a power line, wherein the temperature is determined based at least in part upon time-synchronized voltage and current phasor measurements; and using a computer to compute the sag for a span of interest in the power line based at least in part upon the received temperature, wherein computing the sag for the span of interest comprises computing the sag as a function of both an iteratively updated first value indicative of a length of a conductor of the span of interest at the received temperature and an iteratively updated second value indicative of an amount of tension of the conductor at the received temperature, wherein the length and tension are iteratively updated until the first and second values converge to within respective predetermined ranges of values, and wherein computing the sag includes performing calculations that are not dependent upon data from devices that are locally fixed at the span of interest.