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	37° 21′ 20.52″ N, 140° 59′ 24.89″ E	View all coordinates using: OpenStreetMap

.

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)

Martin's-
* The Tomioka substation. TEPCO built the two Fukushima plants in Tohoku service territory. One town in this service area, Tomioka, is served by one of Tohoku's distribution substations, located here 37°21′20.52″N 140°59′24.89″E, and I'll call that distribution substation Tohoku's Tomioka substation.
* The Momouchi substation. The Tomioka substation is energized by a transmission line from up north. The line is owned by Tohoku and the substation that energizes it is owned by Tohoku. That substation is located just west of the Momouchi rail station in Namie 37°32′05.49″N 140°56′59.29″E, which I'll call the Momouchi substation.
* the Tomiaka line. The power line between the Tomiaka substation and the Momouchi substation, I'll call the Tomiaka line.
* the Yonomori line I speculate that when Fukushima 1, units 1&2 were in planning phase, Tohoku built a new powerline out to the construction site. The new line starts at the Tohoku's Tomioka substation, goes through the upscale suburb of Yonomori, and terminates at the bluff at Fukushima 1 Plant. This must be what is commonly referred to as the "Yonomori line".
*the Yonomori connection This is the location of the connection of the Yonomori Line to the plant site. This is a low capacity connection, 66 kV, between TEPC and Tohoku.
*the Shin-Fukushima substation When TEPCO built Daiichi, it needed to get the power to the grid. One step was the Shin-Fukushima substation, and the first of the two Okuma lines.
*TEPCO-Tohoku connection To connect the Shin-Fukushima substation to the Tohoku grid, Tohoku built a power line from Shin-Fukushima substation to the Tohoku Momouchi Substation. This is a high capacity connection, probably 275 kV, like the Okuma line. There is no need to give this line a name.

* The reference you found is v nice. I cannot post a direct link to Google Maps, but this is an indirect one. Click on the "all six circuits" phrase, to see these transmission lines plotted on Google Maps.
* Re: Transformer vs high voltage switch room, the blue boxes. I don't think that is significant. Transformers are assumed. The new 'Yonomori' connection would be "switched" manually, by connecting the cables to whatever the boss said to.
* The diagram you found shows the Yonomori wires going to Shin-Fukushima. I regret to say I don't see any such tower system on Google Maps, and ... I don't believe it. Built in a week? Is the Futaba line de-energized? And the Okuma Lines de-energized? How can these "Yonomori Lines" be energized if the normal ones cannot be? (I am going to use one "O" for Ookuma.) Daini was getting power from the Shin substation on the 12th. The diagram must be meant in another way. Or is incorrect.
* What do you make of the Okuma line at Units 3&4 being X'ed out, and the others not? That strange marking "agrees" with an strange TEPCO plant status report early on, that one of two lines to units 1-3 was out. One line out. One. This is the "One of Two" Tepco press release from march 11th. Startling.
* The pdf is locked, so I can't use Google translate to read the text. :-(
(MartinGugino (talk) 23:59, 6 May 2011 (UTC))
(MartinGugino (talk) 15:37, 7 May 2011 (UTC))

Please see my latest post at here. Oda Mari (talk) 09:45, 8 May 2011 (UTC) Reading. (MartinGugino (talk) 19:57, 8 May 2011 (UTC))

I don't want say anything, but after every edit the quality of this image is poorer and poor. Not really needed in a encyclopedia. Please rework the image quality or made a new one as png or svg, because this format has no color and quality loss. Best regards ChNPP (talk) 05:42, 9 May 2011 (UTC)

JPEG is the wrong format

Just a hint: JPEG is the wrong format for this kind of file. Please use jpeg only for photos. With every save action you will add more compression artifacts to this image. Best would be: make it new and save it in png and reupload under a new name. Cheers --Saibo (Δ) 13:51, 9 May 2011 (UTC)

Ah, thanks. I did notice the speckles, but I've grown used to it with jpeg. Now I know better. Thanks, it also gives me an opportunity to fix the potential copyright issue that has been sort of crossing my mind. (MartinGugino (talk) 03:12, 13 May 2011 (UTC))

Oh, now I see, it was mentioned also some hours ago in the section above (overseen by me). Maybe you can use the openstreetmap [2] as basis for your work ({{subst:OpenStreetMap}} for upload in the basic form)? Some lines are already included. Cheers --Saibo (Δ) 15:02, 13 May 2011 (UTC)

Yes, that looks like a good idea. Thanks. (MartinGugino (talk) 17:15, 14 May 2011 (UTC))