Amplitude values of the incident and reflected waves in the three-wire electrical transmission line
DOI:
https://doi.org/10.14529/power180205Keywords:
a power line, the falling wave, the reflected wave, integration constants, quality of electric energy, tension, currentAbstract
The transmission of electrical energy along the power lines is effected due to the electromagnetic field waves. In the three-wire power lines the transmission of electrical energy is provided for with three pairs of waves, each containing a falling and a reflected one. The amplitudes of these waves define the voltage and current values in the power lines. The article presents a diagram of the falling and reflected waves amplitude values distribution along a uniform section of a three-wire power line. It shows that electromagnetic waves amplitude values define integration constants. The diagram of the electromagnetic waves amplitude values distribution along the line wire of a three-wire power line shows that that the adjacent current carrying parts significantly impact the voltage and current values of the wire. This diagram is an functional means allowing determining the integration constants values. When the propagation constants of electromagnetic waves on the line conductors of the power line and the appropriate wave resistances are known, these values can be used to define the amplitude values of the falling and reflected modes along all power line. The outcomes of the research can be used in design, reconstruction, and maintenance of three-wire power lines to forecast the voltage and current values in different sections of a power line. Forecasting the amplitude values of the falling and reflected electromagnetic waves in the line wires of double-circuit transmission lines shall allow for the detailed analysis of voltages and currents in a uniform section of a power line. The suggested technique may also be applied for low-quality electric energy.
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