Abstract
The power frequency parameter of transmission line is the basic parameter of line over-voltage calculation. It is necessary to get the parameters of 1000kV AC double-circuit line on the same tower in order to guide the operation of the project. In this paper, a method of accurately calculating UHV transmission line parameters is proposed. The length of the line is known, the voltage and current at the head of the line are measured, and the zero sequence, positive sequence total impedance and total capacitive reactance are obtained. Based on the distribution parameters Calculation formula, the line unit capacitance, resistance and inductance parameters can be obtained. The method of this paper is compared with the simulation of transmission line parameters in ATP simulation. And Through the actual measurement of the frequency parameters of Yu-heng 1000kV transmission line, it is verified that this method is suitable for the calculation of distribution parameters of UHV transmission lines.
Highlights
UHV is the world's advanced transmission technology, with the advantages of large transmission capacity, long transmission distance, low line loss and less occupied land
UHV transmission Line Power frequency-sequence parameters for the system engineering is very important, these parameters can be obtained by actual measurement and calculation
This paper presents a single-ended method to accurately calculate the power frequency parameters of UHV AC transmission line: measuring the voltage and current at the head of the UHV AC transmission line, and analyzing and calculating the relationship between unit resistance R0, unit inductance L0, unit capacitance C0 and unit conductance G0 in the distribution parameters of UHV AC transmission lines,by using the long-line equation to get the corresponding transmission line parameter formula, so as to get enough accurate frequency parameters
Summary
UHV is the world's advanced transmission technology, with the advantages of large transmission capacity, long transmission distance, low line loss and less occupied land. UHV transmission Line Power frequency-sequence parameters for the system engineering is very important, these parameters can be obtained by actual measurement and calculation. The single-ended measurement method proposed in Literature [4] is to use the equivalent calculation to approximate the result of the power frequency parameter. This paper presents a single-ended method to accurately calculate the power frequency parameters of UHV AC transmission line: measuring the voltage and current at the head of the UHV AC transmission line, and analyzing and calculating the relationship between unit resistance R0, unit inductance L0, unit capacitance C0 and unit conductance G0 in the distribution parameters of UHV AC transmission lines ,by using the long-line equation to get the corresponding transmission line parameter formula, so as to get enough accurate frequency parameters.
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