Abstract
A live line measurement method for the zero sequence parameters of transmission lines with mutual inductance is introduced. The mathematical models of the measurement method are given. Global Positioning System (GPS) is used as the synchronous signal for the measurement carried out at different substations simultaneously. The measurement system and digital simulation results are given. Finally, the live line measurement results of two 220 kV transmission lines with mutual inductance in Hainangrid are given. Results from both simulation and on-site measurement show that the live line measurement method is feasible, and its measurement accuracy can satisfactorily meet the requirements of engineering measurement.
Highlights
Accurate line parameters are the foundation of relay protection setting calculation, fault location, fault analysis, network loss and power flow calculation
The live line measurement results of two 220 kV transmission lines with mutual inductance in Hainan grid are given. Results from both simulation and on-site measurement show that the live line measurement method is feasible, and its measurement accuracy can satisfactorily meet the requirements of engineering measurement
The measurement results of the live line measurement method prove that it can meet the requirement of parameter measurement of transmission lines
Summary
Accurate line parameters are the foundation of relay protection setting calculation, fault location, fault analysis, network loss and power flow calculation. The calculated values are unable to meet the requirement of relay protection setting calculation. The traditional measurement methods can only be used under the cases that all lines must be withdrawn from normal operation. To measure the zero sequence self inductance of a new line, because the new line has electromagnetic coupling with other live lines, the parameters of the new line cannot be measured independently with the traditional methods. We should withdraw all the lines from normal operation before measuring the zero sequence parameters. It is not acceptable for power system. The measurement results of the live line measurement method prove that it can meet the requirement of parameter measurement of transmission lines
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