REAL-TIME POWER-LINE SAG MONITORING USING TIME-SYNCHRONIZED POWER SYSTEM MEASUREMENTS
First Claim
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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
computing 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 a zero tension length for a conductor of the span at a reference temperature as a function of a known length of the conductor at the reference temperature and a cross sectional area of the conductor.
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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.
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Citations
28 Claims
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1. A computer-implemented method comprising the following computer-executable acts:
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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 computing 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 a zero tension length for a conductor of the span at a reference temperature as a function of a known length of the conductor at the reference temperature and a cross sectional area of the conductor. - View Dependent Claims (2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15)
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7. (canceled)
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16. 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 (17, 18, 19, 20, 21, 22, 23)
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24. 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 (25, 26, 27, 28)
Specification