FIELD: electricity.
SUBSTANCE: voltage and current in the first and second locations on the power line are measured. Meanwhile the measured voltages and currents in the first and second locations are time synchronised. The power line impedance between the first and second locations is determined using the measured voltages and currents. The temperature of the power line wires is determined. At the temperature To of the power line wires the reference longitudinal active Ro, inductive XLo and capacitor XCo resistances of the power line between the first and second locations are determined. At the temperature of T1 the reference active resistance of the power line R1 between the first and second locations is determined. The reference temperature coefficient αo of active resistance of the line wires is determined by the formula αo=(R1-Ro)/(Ro·(T1-To)). At the temperature T of the power line wires the instantaneous longitudinal active R, inductive XL and capacitor XC resistances of the power line between the first and second locations are determined. At the temperature T' of the power line wires the instantaneous longitudinal active resistance R' of the power line between the first and second locations is determined. The instantaneous temperature coefficient α of active resistance of the line wires is determined by the formula α=(R-R')/(R·(T-T')). As the parameters characterising the overhead electric line wires the difference of the instantaneous and reference resistances (R-Ro), (XL-XLo), (XC-XCo) and the difference of the instantaneous and reference temperature coefficients of active resistances of the line wires (α-αo) are used.
EFFECT: expansion of possibilities of the method of overhead electric line wire quality control.
1 dwg
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Authors
Dates
2015-02-20—Published
2013-11-19—Filed