To accelerate the popularization of renewable energy described.properties of dc cable DNA ~ ~ descendants of developers
The long-awaited described.properties of dc cable
Between countries or regions between the power of the equipment is called "and cable".As the world's big stride towards decarburization society, countries with a view to the future, committed to by multinational and cables as mesh woven grid and the grid between regions, realize power interconnection in the vast area.Under the background of these energy market trends, sumitomo electric one after another in recent years to undertake a lot of manufacturing and "described.properties dc cable and cable laying project.
The advantages of dc power transmission cable is "long" and "large capacity transmission.In addition, compared with the oil-immersed insulated cable, for crosslinked polyethylene insulation described.properties of dc cable is more environmentally friendly.As a leader in the field, sumitomo electric industries in 90 ℃ (20 ℃) is higher than in the past the high conductor temperature, the normal operation and in the global power voltage polarity reversal, the large capacity power to achieve, according to the direction and the use of the Internet to change the dc voltage (positive and negative polarity reversal, change the direction of transmission) of innovative high voltage dc (HVDC) cables.
Power providers all around the world on the transmission cable has high hopes of.Although described.properties cable in the 1960 s, on the other hand, are practical in alternating current (ac) and widely popular, but in terms of direct current (dc), after entering the 21st century will not smell success stories.In this context, sumitomo electric industries in 2012, equipped with a Japanese Hokkaido and interconnection between equipment state (hereinafter referred to as the "north and cables") cable, the project in the global described.properties pioneered in cable, high voltage dc transmission is realized.
Sumitomo electric is how to develop this kind of cable?Let's review to realize this dream the development track of YiChang years.
S the types of cable
| The types of insulation | Oil-immersed insulation | Solid insulated | |
|---|---|---|---|
| OF the cable | The MI cable | Described.properties cable | |
| structure | The low viscosity oil pressure after sealed insulating paper | After soaking high viscosity oil seal in insulating paper | Add anti charge accumulation in crosslinked polyethylene additives |
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| The long distance | delta | Thecountry. | Thecountry. |
| The large capacity | Thecountry. | a. | Thecountry. |
Origin of the spirit of the challenger
Sumitomo electric originated from sumitomo and copper plant.In 1897, sumitomo and copper factory to besshi tongshan copper as raw materials to produce the output of copper, copper, copper products.In 1905, the refinery was moved to the four e. seto inner sea desolate island.In 1922, in order to achieve a stable power supply, sumitomo electric industries between the city and the four e. island in our new house (21 km apart) success was the world's longest cable laying.No matter how much time, but also perseverance to achieve development and production, can say this is the inheritance from four e. island challenger spirit of sumitomo electric's unique personality.Since then, sumitomo electric industries developed all kinds of power cable with industry-leading attitude.
The world's first HVDC commercial project is in Sweden in 1954 between native and gotland cable laying project.After many years, with insulating Oil in the dc power cable insulation OF cable (Oil - Filledcable) and MI cable (Mass Impregnatedcable) such as oil-immersed insulation cable has become the mainstream market.But as the world environmental protection consciousness raising, the market demand is no risk of an oil spill to environmentally friendly insulated cable.
Then in the second half of the 1970 s, Japan began to study described.properties of dc cable.At that time, as the described.properties has practical communication cable directly to dc, people carried out long-term electric power test, but due to the accumulation of space charge in the insulator (see later), the influence of hard to the communication cable directly to direct current.Based on the results, sumitomo electric industries in 1984 entrusted the power development corporation's development began to promote described.properties of dc insulation materials on the basis of development.
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The basic knowledge of direct current (dc) and alternating current (ac)
Current into direct current (DC) and alternating current (AC) two kinds.Like dry cell, for example, from the positive uniflow toward the negative current is called direct current.And alternating current (ac) is electric current in the positive and negative electrode current flows back and forth like a wave.Electricity in the form of "communication" from the power plant to be delivered to households, so almost all households are alternating current (ac).
Why the alternating current into the mainstream?Back in the 1880 s after the half, inventor Thomas Edison and tesla around future power system should be a direct current (dc) or an alternating current dispute happened.Edison was the first to light with dc transmission, but he faces a long distance transmission has many problems, for example: due to technical limitations at that time, difficult to make voltage conversion;In order to power transmission, you need to use very thick copper wire, which leads to higher costs.On the other hand, tesla began working on ac power.He has far more than the size of the Edison electric power system, and can easily convert voltage alternating current (ac) characteristics, through the high voltage power transmission, step-down and the electricity, finally realizes the long-distance transmission.In addition, compared with direct current, alternating current (ac) lower cost of equipment, maintenance less pressure, apply to the municipal infrastructure, therefore, including Japan, the world almost all of the grid is ac power grid.
Back to the modern, such as personal computers and smartphones need complex control precision equipment by the alternating current into direct current (dc) AC power adapter, dc operation.Air conditioners and refrigerators frequency converter is adopted by the alternating current into direct current (dc) device, which can realize complex control and energy saving.Generally think that direct current (dc) for charging, usually for electric vehicles and charging equipment (i.e., applicable to renewable energy).Edison had the opportunity to realize to the age of the start, the leading role of a new generation of electric power systems may be direct current.
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