(20 pa) 11. Subtransmission systems can be configured as radial, improved radiai

Question

(20 pa) 11. Subtransmission systems can be configured as radial, improved radiai. radial, loop, or topologies. A vacant area is being developed with residential, commercial, nehwork and some light industrial load. No subtransmission exists in the area. The transmission planner recommends building the initial subtransmission system in area as an improved radial topology, Then, over time, the system can be converted to a netrwork topology Propose radial to network. (What should be the "trigger" to start the conversion?) a strategy to determine when the conversion should be made from improved

Explanation / Answer

In order of merits of service continuity, The improved raidial system is better the radial system. Thus, initially, the improved radial topology is selected.

For lower loads at subtransmission level, the improved radial toplogy will do. But for large loads such as industries, the improved radial topology will result in higher losses because of large tranmission line length. Also there would be voltage drop in the line affecting the end user equipments.
Strategy:

For large loads, when electrical power demand is >500MW is to be transmitted over long ranges of distance > 80 km, the topology must be changed to an advanced version such as ring or network topologies. So the crieteria for the change of topologies are the power demand and the distance of transmission.

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