Transmission Proprieties of Overhead and Cable LV Power Lines – the Comparison in the Frequency Spectrum from 3 kHz to 150 kHz

摘要

The paper compares two main types of the power lines, namely, overhead lines and cable lines. The analysis was done in a low-voltage mains network in the frequencies identified by the CENELEC organization for a narrowband transmission using low-cost PLC (Power-Line Communications) modems. Currently, data transmission with the use of the PLC technique finds increasing use in the area of the communication for the Smart Grid, especially because of the development of Smart Metering and Smart Lighting systems. Independently from the implementation of the PLC transmission technique, a process of the replacement of overhead lines with cables is carried out. Undoubtedly, this process must have an influence on the transmission prosperities over the mains network. This paper is aimed to show differences in the secondary transmission parameter of the two main constructional types of low-voltage lines, which have the same electro-power parameter. The influence of these differences on the transmission quality is also discussed. The study was limited to aluminium and copper wires and was made in the low-voltage mains network.