# Characteristic Impedances in Low-Voltage Distribution Systems for Power Line Communication

• Kim, Young-Sung (Dept. of Electric Apparatus Testing, Korea Electrotechnology Research Institute) ;
• Kim, Jae-Chul (Dept. of Electrical Engineering, Soongsil University)
• Published : 2007.03.01

#### Abstract

The input and output impedances in a low voltage distribution system is one of the most important matters for power line communication because from the viewpoint of communication, the attenuation characteristic of the high frequency signals is greatly caused by impedance mismatch during sending and receiving. The frequency range is from 1MHz to 30MHz. Therefore, this paper investigates the input and output impedances in order to understand the characteristic of high frequency signals in the low voltage distribution system between a pole transformer and an end user. For power line communication, the model of Korea's low voltage distribution system is proposed in a residential area and then the low voltage distribution system is set up in a laboratory. In the low voltage distribution system, S parameters are measured by using a network analyzer. Finally, input and output impedances are calculated using S parameters.

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