Real-time power-line sag monitoring using time-synchronized power system measurements
First Claim
Patent Images
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.
5 Assignments
0 Petitions
Accused Products
Abstract
A sag calculator (112) computes sag for a span of a line section based at least in part upon an average temperature of the conductors in the line section. A temperature calculator (110) determines the temperature by ascertaining an ohmic resistance of the conductor lines based at least in part upon time-synchronized power system voltage and current measurements such as (but not limited to) phasor measurements generated by phasor measurement units (104, 106). The temperature calculator (110) determines the temperature as a function of the ohmic resistance.
-
Citations
27 Claims
-
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. An apparatus, comprising:
a sag calculator that computes, in real time during an operation of a power line, a sag for a span in the power line based at least in part upon a determined time-varying temperature of a conductor in the power line, wherein the time-varying temperature is determined as a function of phasor measurements generated by one or more devices at vertices of the power line during the operation of the power line. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
-
23. A computer-readable medium comprising computer-executable instructions for:
-
calculating, in real time during the operation of a power line, the time-varying sag for a span of the power line based at least in part upon a time varying temperature of conductors in the line section, wherein the temperature is ascertained through analysis of phasor measurements obtained during the operation of the power line; and storing the calculated sag. - View Dependent Claims (24, 25, 26, 27)
-
Specification