File talk:FukushimaGrid.JPG
This diagram is based on the Google Maps of the area, and was made by tracing the transmission towers across the land, from the switch yard at the two plants to the termination at the substation. This is a tracing over the map in order to avoid questions of copyright. This is a link to MyMaps which shows the transmission paths [1]
- Put it in description. Ugh, shouldn't there be more than one power line going to Fukushima Daiichi? I thought it was regulation to have 2 connections for redundancy in order to prevent the likelihood of station black out. There has to be another. Theanphibian (talk) 00:21, 11 April 2011 (UTC)
- Each line is a pair of circuits. I am surprised to see that there is only one set of towers (two circuits) from Daini's 4 units to the substation, whereas Daiichi's 6 units has three sets of towers (six circuits). There is another lower voltage circuit going north from the substation that crosses underneath the wires from units 5&6, but that (lower voltage) circuit is not included in the diagram. It is on the Google Maps however.(MartinGugino (talk) 07:35, 11 April 2011 (UTC))
- I confused "Daini" and "Daiichi" in my descriptions. Thanks for clarifying the matter of circuits and towers. It makes sense now, but I understand your surprise that there is only one right-of-way leading to Daini. Theanphibian (talk) 15:45, 11 April 2011 (UTC)
- You say, in the description, "is managed by another company". I assumed that all these lines were owned and operated by Tomoku Power. Do you think that TEPCO owns these lines to the substation? I never thought of that as a possibility. (MartinGugino (talk) 07:35, 11 April 2011 (UTC))
- By "Tomoku" you mean Tohoku Power, I take it? They are the utility to the north. Yes, I believe that the plants themselves lie outside of Tepco's service area, but if you refer to Tepco's annual report, the red lines are owned by themselves. So yes, they own power lines outside of their service area, and in particular, the critical connections to their own power plants. It appears that Tepco's service area is relatively small, but metropolitan so it gets the lion's share of demand. There are most certainly large power flows from the substation to the South West. I don't find it surprising that these are Tepco's lines. Even if it's Tohoku's service area, there is a big difference between owning and managing major transmission lines and providing electric service to an area. Theanphibian (talk) 15:45, 11 April 2011 (UTC)
- You say "and the Fukushima Daini plant by the Futaba Line (双葉線) and the Ookuma Lines (大熊線)." I see only the one set of towers, and the one interconnect at the Daini plant. Are you sure you have not switched the names of the plants? The line to units 5&6 is different, I assume of later construction, than the lines to units 1-4. (MartinGugino (talk) 14:18, 11 April 2011 (UTC))
- Switching the names of the plants is exactly what I did. I have some correction work to do. Theanphibian (talk) 15:45, 11 April 2011 (UTC)
Voltages
This TEPCO publication shows the transmission line voltages on pg 17. as of March 31, 2003. signed later: (MartinGugino 03:51, 30 April 2011 (UTC))
Yonomori Line
There is another transmission line n the vicinity, the Yonomori line. It borders Daichi on the south, and proceeds south beyond Yonomori to a distribution substation, here
| Object location |  | View all coordinates using: OpenStreetMap |  |
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- I looked into this, allow me to share what I know. The main relevant reference I found was from Tepco, a situation update. On page 3 it shows the connections from the Shin-Fukushima Substation to the reactors. It includes the lines already shown in the diagram and the Yonomori line, which goes from the substation, via 2 lines, to supply units 5 and 6, which is exactly redundant with the Futaba line.
- What I don't know:
- I don't know if this is new or supplementary. I have seen it identified as low-voltage, so it won't be identified in the major transmission line maps that we got the information for the rest of them from, and it also indicates this is likely an emergency supplementary connection.
- I see that it connects to the turbine-building, but I do not know how it does this exactly. The Futaba line (as well as others) have a station between it and the plant, I expect this to be a transformer station, but the pdf only indicates it as a high voltage switchroom. This is confusing to me. Theanphibian (talk) 16:31, 3 May 2011 (UTC)
