The limits of ring transmission systems
This paper presents the mathematical analysis for the boarders of steady-state operation of the suggested ring transmission system. It is based on the ?-equivalent concept for the transmission lines. The power limits are deduced and then both maximum and minimum transmission efficiencies for a typical 500 kV line are computed. The best allocation for the ring appears at the midpoint bank with consecutive capacitive/inductive branches. A new three-plane coordinates are illustrated and used with power study, and consequently the power diagram is investigated and formulated on PQ plane. The practical distances for transmission are considered. The condition of the load voltage is derived as well as the transmission efficiency is obtained. Different angles for the load impedance were included. Then finally, the rate of rise of front voltage wave (as initial step for switching operation) is computed.
ring transmission steady state compensation new coordinates