The construction of the tunnel when laying cable

To stabilize the power supply as the goal of the interconnection between regions new north tunnel project this dc green letter ~ ~

To avoid large-scale outages

New north and cable installation path
New north and cable installation path

In September 2018, due to the earthquake, Hokkaido bile vibration east Hokkaido global large-scale blackouts happened.

Just finished all process of new Hokkaido, honshu interconnection between equipment (hereinafter referred to as the "new north the and network") in March 2019 putting-in-service proactively as the goal, is to carry out a test run.As stated earlier, in Hokkaido has existed between the state and by the power development co., LTD since 1979 north this putting-in-service proactively and cable (cable), its purpose is to phase in Hokkaido electric power demand, receive from the state transportation power, stable power supply.Then, in 1993, equipped with a 2) cable, and for the replacement has been the issue of old cable, described.properties again in 2012, equipped with a dc cable (total transmission capacity of 600000 kW).But in order to achieve long-term and stable supply of Hokkaido, can further enhance the capacity of 300000 kW power transmission new north and Internet arises at the historic moment, the green function of the tunnel underground grid project called new north tunnel project of the dc green letter.

In Hokkaido electric power co., LTD (hereinafter referred to as the "Hokkaido electric power") as a backbone of engineering center, director of the project's command fukushima know Mr Give vent to the mood of that period:

"As a response to north and suspended cables and large-scale renovation, and so on and so forth measures in the future, we are from long ago has plans to expand and network cable.In addition, the plan of east Japan earthquake power as an opportunity to exchange and expand and strengthen the power cable has become the top priority.About the new north and cable, we in the two months after the earthquake started to survey and design, and the size of the cable, its construction period is very nervous, we aim to putting-in-service proactively within five years after starting work.Whenever someone says to me: 'if the new north and cable repaired early, perhaps Hokkaido global power outages will happen', then regret will come to mind."Fukushima (Sir)

New north of this section and cable path
New north of this section and cable path
New north bin and cable path section (Hokkaido electric power Network corporation (new north bin and wiring Hokkaido on one side of the big dipper today don't substation, substation and the state's side of the green function of the tunnel underground grid project 24 km is the new north this dc green letter tunnel project)

The tunnel to the harsh environment challenge

Public welfare foundation of Hokkaido comprehensive revitalization of science and technology center (North Tech consortium) fukushima know Mr (Hokkaido electric power co., LTD existing member)
Public welfare foundation of Hokkaido comprehensive revitalization of science and technology center (North Tech consortium) fukushima know Mr (Hokkaido electric power co., LTD existing member)

Cable laying places is a "green tunnel".Whether for Hokkaido electric power, or for sumitomo electric industries, this is an unprecedented challenge.Mr Fukushima and basic plan draw up the project head, he was also has a sense of unease in the heart: "really would be able to complete it..."

"As for why choose in such a harsh environment of green tunnel, because after the cable putting-in-service proactively, workers can enter inside the tunnel" visual inspection "cable, easy to check and maintenance.Having said that, but not the Shinkansen green letter of tunnel driving the main tunnel, but the smaller in parallel with the construction of the tunnel.In tunnel near the top of the cable laying, installations and operating space is very narrow, design, process and site management must conform to the tunnel environment."Fukushima (Sir)

Then 1 year time, everybody repeated investigation within the tunnel on the environment, and out of the path planning and equipment.Sumitomo electric stage from the survey will also get involved, for safety propulsion engineering conscientiously, carefully mastered the relevant information.Even so, after the actual construction, happen every day all sorts of problems large and small.

"In dark tunnel, and is located in the bottom of the sea, so the humidity has been higher than 80%.In addition, through the main the Shinkansen formation of the wind pressure of the tunnel will be rolled up a large amount of dust.Although engineering environment is so harsh, usually it takes 8 to 10 years and cable project finally successfully completed in five years, as planned is almost a miracle.It is difficult for the whole project in a word, but in retrospect, I think it is common to all the members should be docking has a variety of topics, and on every subject is not compromise, after all the people together to solve issues of results.Most importantly, sumitomo electric was delivered in a short time for 24 km described.properties of dc cable, its technical strength is very good."Fukushima (Sir)

Japan and the dc cable

In 2018, a massive power outage in Japan.Since then, people began to explore the importance of the Internet.In the 1990 s, has just been developed special self-excitation type ac/dc high voltage dc (HVDC) converter was first used in Japan and cables, the new north and cables."For two kinds of ac/dc conversion way described.properties of dc cable is the height of the sumitomo electric development capabilities and technical strength.For sumitomo electric industries, this is a very valuable project."Power project department of Abe and jung said confidently.

Abe and jung power projects division
Abe and jung power projects division

"Dc grid is a kind to each other in the wide area power grid, such as highway, while the regional grid supply electricity to households and businesses are similar to ordinary road.This kind of common way is ac power grid, and ac/dc converter is similar to the way of inward and outward.Ac/dc conversion into separately excited and self-excited, and sumitomo electric described.properties of dc cable can be applied to these two kinds of ac/dc conversion method.New north turn this and hand in cable is in self-excited type vertical flow changer "described.properties dc cable" appropriate to the success of Japan's first project.In the field of Internet cable and, in the future the same specifications of the demand is expected to increase.I believe we've made to be dc transmission cables leading brand."(o)

In this architecture "and cable" a big step

Witnessed the new North of this completion and cable has been sent to Mr Fukushima to public welfare foundation of Hokkaido comprehensive revitalization of science and technology center (North Tech consortium), dedicated to Hokkaido industries.

"' zero carbon Hokkaido is Hokkaido government push one of the 'bone too guidelines.Hokkaido, in the field of renewable energy, led by offshore wind, with Japan's leading potential.Japan carbon neutral with the '2050' as the goal, I think the Hokkaido will play as a leader role in this process.But because renewable energy depends on weather conditions, so we must build up the strength of the grid, to ensure that no matter how much energy supply can respond.If the Internet cable and further expand in the future, in addition to receive from the state power, Hokkaido will generate renewable energy delivery to the state's electric power industry will further speed up the pace."Fukushima (Sir)

People across Japan by huge connected to the grid, and methods through a variety of places will send electricity to electricity area.To say the new north and cable is to realize this architecture is a big step.Is now promoting domestic offshore wind power project Abe was described.properties "dc cable" talked about his own future ambitions.
"To popularize power renewable energy is not stable, we must build up the supply stable and wide-area network cable.In Japan at home and abroad and line project, foreseeable 'described.properties dc cable's presence will continue to ascend.I hope to further abroad experience, knowledge and insights, positive response to Japan's growing domestic demand."(o)

History in the energy will shift, dc described.properties of sumitomo electric cable as electricity service partner, will be to fully play its role.

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