Subtransmission systems can be configured as radial, impro network t opologies.

Question

Subtransmission systems can be configured as radial, impro network t opologies. A vacant area is being developed with residential, commercia some light industrial load. No subtransmission exists in the area. The transmission planner recommends building the initial subtransmission system in that area as an improved radial topology. Then, over time, the system can be converted to a nenwork topology Propose a strategy to determine when the conversion should be made from improved radial to network. (What should be the "trigger" to start the conversion?) Draw a one-line diagram of a 230 kV substation connecting six elements (two generating units and four transmission lines). Model the generating units as a generator in series with a generator step-up transformer (GSU). Use a combination of breaker-and-a-half and double breaker double bus topologies. Explain your reasoning for which elements are connected to breaker-and-a-half bays and which elements are connected to double breaker bays. Label each breaker with a unique letter to identify it.

Explanation / Answer

Since in first few years of development of that area, the demand will be low and the area can afford low power continuity, the improved raidial yopology can be employed.

The conversion from one topology to the other depends on the LOAD demand. It is the trigger for the conversion. When th e load demnad increaseas, the area cannot afford power discontinuity. Thus, conversion from one topology to an enhanced version is required.

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