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The new energy-saving wire let uhv transmission more economy

Jiangsu 500 kv power grid double doosan-changshu south transmission line engineering, the line length of 27 km, transportation capacity of 2.1 million kilowatts. Through the use of the new energy-saving wire reduce transmission loss, the whole line of 800000 kilowatt hours of electricity power saving, energy saving effect is remarkable. This new type of wires with the energy saving exactly how, and how to carry on the technical research?

The transmission lines project construction, international generally used ordinary steel calls al stranding wire as the overhead transmission wires, so far there have been more than years of history. ratchet tie dowmHow to improve the wire intensity and improve conductivity, is always the experts at home and abroad of research.

In 2012, the east China grid company limited successfully launched this highly conductive aluminum wire type line and highly conductive steel calls al stranding wire. The two new types of wire can not only improve the transmission power, reduce the loss of line, improve the transmission wires, reduces the noise current operation, and has better electrical and mechanical properties, especially the wire has the extremely reduce "the characteristics of the frost.

Application to examine
This highly conductive aluminum wire type line and highly conductive steel calls al stranding wire, in uhv transmission lines in the batch, can effectively reduce the line loss, wires, radio interference and field surface can hear noise, reduce the power network operation cost and improve the transmission efficiency of energy.

Jin screen-southern jiangsu + 800000 volts HVDC transmission line project: 2100 km, transportation capacity of 7.2 million kilowatts. The engineering application two conventional wire, with high conductivity if this hard al stranding wire, aluminum alloy core al stranding wire alternative, under normal power, the transmission 5000 hours can reduce electric power 45400 KWH/km, the whole line of reduce electric power 95.32 million kilowatt hour, greatly improve the economic benefits of inter-district transmission. If each to save 1 KWH of electricity, 0.997 kg of carbon dioxide emissions reduction can be calculated, booster cablesjin SuTe HVDC transmission engineering export 95.32 million kilowatt-hours a year more power, 95034 tons of carbon dioxide emissions.

The three gorges-Shanghai + 500 kv power transmission project line is a 1048.6 dc km, transportation capacity of 3 million kilowatts, if the full aluminium wire strength according to replace conventional wire calculation, normal power, if a year hours for 4000 hours transport, power saving 79800 KWH/km, every year all power saving 83.72 million KWH.

Electrical energy saved a lot of equivalent to increase the amount of power generation capacity, effectively relieve electricity demand growth brings environment pressure.

Make the resource conservation green power grid

Since 2008, the east grid company limited for the construction of the regional network characteristics and practical, begin to pay close attention to this subject and research.

In early 2010, east China grid company limited and east China electric power design institute, wuxi huaneng cable Co., LTD. Jointly develop composite materials soft aluminum wires. However, the first batch of new aluminum wire trial-produced, is not satisfactory. Wire exposed the material cost is high, soft, complicated application technology, etc. On one hand, because of the composite wires is soft aluminum, its applicability and reliability are hard to overcome the defects nature; On the other hand, the al stranding wire conductivity although ascension to 63%, but the price is expensive, make engineering construction investment growth is bigger.

To realize the defects of the wire, east China grid company limited, east China electric power design institute and wuxi huaneng cable company of experts and technicians to continue research, determined the more specific research topic, and joint southeast university institute jointly set up r&d project materials group, the team points three group, each group have different functions. East China power grid Co., LTD team in determining the regional network in internal and different voltage grade of the construction of the new route engineering and wire of the target, requirements; East China electric power design institute is the construction of the project in accordance with the line blueprint, provide different design parameters, and according to the specific circumstances put forward the improvement methods in order to meet the design the optimal; And wuxi huaneng the cable companies is developed according to the demands of the commitments and the key technology and difficulties in products, emphatically from the liquid aluminum formula, improve the adjustment process of level.

In the development process, in order to further reduce the aluminium wire drawing conductivity in the process of the loss, third party engineering and technical personnel of southeast university joint of aluminium wire drawing process of stress, deformation, defect damage, and other computer simulation analysis, and ultimately determine the appropriate compression ratio, and the Angle of mould precise and effective control and nap, so that the process of pulling out the defects of at least some internal aluminium wire, the influence of conductive rate is the smallest. After more than a year of practice and technology research, battery clipthis highly conductive al stranding wire finally successfully developed.

In August 2010, the product of this project through the Shanghai electric cable research institute of the performance testing, each index is up to standards and requirements of the new products by report couplet additionally identification. Appraisal show that this highly conductive al stranding wire high conductivity, for the domestic initiative, reaching the international advanced level.

In 2012, the east China grid company limited again on this foundation successfully launched this highly conductive aluminum wire type line and highly conductive steel calls al stranding wire. The two new types of wire can not only improve the transmission power, reduce the loss of line, improve the transmission wires, reduces the noise current operation, and has better electrical and mechanical properties, especially the wire has the extremely reduce "the characteristics of the frost.

This highly conductive aluminum wire type line and highly conductive steel calls al stranding wire, in uhv transmission lines in the batch, can effectively reduce the line loss, wires, radio interference and field surface can hear noise, reduce the power network operation cost and improve the transmission efficiency of energy.

High conductivity hard aluminum wire energy-saving prospect

Ordinary steel calls al stranding wire as transmission wires in international have been used for more than 100 years. Our country of low energy research of the wire, starting in the s. Through to the electrician aluminum conductor and the deepening of the rare earth optimization aluminum, aluminum hard conductivity increases by 3%.

According to the statistics, in 2010, China's power transmission line loss for 171 billion kilowatt-hours; By 2015, 20% if transmission lines using high conductivity hard aluminum wire technology, total loss can reduce 1.026 billion KWH. Therefore, high conductivity hard aluminum wire to our country grid upgrading, and improve the transmission efficiency, reduce the loss of line and operation cost, a vital role.

High conductivity hard aluminum wire advantage many, one is energy-saving: the relative to the conventional wire conductive rate, high conductivity hard aluminum wire conductivity increases about 3%, reduce the resistance loss. The other is to decrease tower investment: because the wires wind load reduced 10%, tower can reduce weight is about 0.5%. Three is compressed corridor width: 500 kv double loop using uniform the towers type line width may reduce the corridor 0.5 meters. Four wire is to improve vibration control and anticorrosive property: for stranded inner conductor closely, the rain dust is not easy to enter, be helpful for internal anti-corrosion oil remain stable for a long period. Five is the operation reliability: can lower corona discharge of the noise and the line loss.
 

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