Thursday, April 28, 2011

Work on the Yonomori line

The Yonomori Line is a low voltage line south to a distribution substation near Yonomori. It leaves the Daiichi plant towards the south, going along the first base line of the ballfield. Notice that the insulators differ from one side to the other. The Yonomori Line is not connected to the Fukushima transmission substation. It looks like it might be owned by Tohoku, as it goes South, then West then North to a substation just west of Momouchi 桃内駅.

Thursday, April 07, 2011

Fukushima transmission lines and substation

click image to enlarge
Daini was powered by midnight by the Fukushima substation. Why do we think that all six transmission circuits to Daiichi failed?
[4 circuits on the Okuma Lines (275kv) to units 1+2 and 3+4 and 2 circuits on the Futaba Line (500kv) to units 5+6. The Yonomori Line is not connected.]
Three towers would need to fail for a "station blackout".
Farther north, there were towers damaged or destroyed in the lowland swept by the tsunami, but they were in the path of the tsunami, close to the coast, and there were not many.