For example 1000kv rated lines have been built in Japan but they recently lowered the voltage on to run only 500kv which is half it's capacity. Why have these altra high voltage lines around the world suddenly have been not run on it's full capacity?
2007-07-01 05:53:53 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
These UHV lines are few and far between. Above 765 kV, the lines are considered experimental. Without knowing exactly which of the lines you mention, we can only speculate about the root causes for the change.
Perhaps there were problems with the transformer or line design that did not support continued operation at UHV levels.
Perhaps there was an equipment outage on one of the terminal transformers, and they had to switch to a more common EHV (500 kV) operating voltage until the UHV equipment can be replaced. For transformers, building a new specialty one can take a very long time (6 - 24 months), because the factories are full.
Do you know which lines have been re-rated? Or was it all of them in the Japanese system?
2007-07-01 09:05:12 · answer #1 · answered by Steve W 5 · 1⤊ 0⤋
Just an educated guess:
It is possible that the insulators for the UHV lines have degraded (by normal processed for all insulators), and they no longer can handle the UHV.
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2007-07-01 20:26:39 · answer #2 · answered by tlbs101 7 · 0⤊ 1⤋