Why are the lower voltages of transmission systems often tied together? For example, where you have 345kv/115kv, 400kv/132kv, or 500kv/161kv, the lower voltage system is often tied together with interconnecting transmission lines even though the majority of the generation is at the high voltage level ie 345kv and above.
Second why isn't 115kv, 138kv, 161kv, ect refereed to as sub-transmission even though today these voltages today are stepped directly down to distribution, ie 13.8kv?
Red Flag Submitted
Thank you for helping keep Eng-Tips Forums free from inappropriate posts. The Eng-Tips staff will check this out and take appropriate action.
Reply To This Thread
Posting in the Eng-Tips forums is a member-only feature.