Fractional Frequency Transmission System

The fractional frequency transmission system (FFTS) is a recently developing trend in power transmission. In such a system, electrical power is transmitted at a reduced frequency (One third of the rated frequency=50/3 Hz).This approach would be effective in long-distance transmission of electrical power. Transmitting power at a reduced frequency reduces the electrical length of the transmission line (i.e., more amount of power can be transmitted using the same length of the line at reduced frequency than at rated frequency).This paper introduces the experimental installation of FFTS and primary experiment results. The experiment uses cycloconverter as a frequency changer, which is used at the sending end to step the frequency down to 50/3Hz. Similarly, at the receiving end another cycloconverter is used to step-up the frequency back to 50Hz.The FFTS approach proposes new method of increasing the transmission capacity.(1)