Abstract: When the actual length of transmission line is less than the half wavelength, the manual tuned compensation is needed. However, detailed analysis is needed to determine the appropriate tuned network types. Firstly, based on the existing three types of tuned networks, their respective suitable modes for compensation are investigated. In addition, the installation and distribution mode suitable for each tuned network is discussed. Finally, the overvoltage of each tuned transmission lines is comparatively analyzed. The results show that the reactive power is surplus when distributed compensation is used for capacitor-type tuned network; For PI and T type, the overvoltage level under distributed installation is higher than that under centralized mode, and the overvoltage level is low when line side compensation is used. Therefore, it can be concluded that the C type tuned network is suitable for the distributed compensation, while the PI and T type tuned networks are more suitable for centralized compensation; the three types of tuned networks are suitable for centralized installation on the line side.

Key words: half-wave-length AC transmission, tuned network, compensation mode, installation position, distribution mode, overvoltage