|Place of Origin:||Guangzhou, China|
|Certification:||ISO9001, ISO14001, OHSAS18001|
|Minimum Order Quantity:||Negotiable|
|Packaging Details:||100 m / tied, or customized|
|Delivery Time:||10 day|
|Payment Terms:||30% deposit, the balance is settled on the delivery date|
|Supply Ability:||100,000 m / month|
|Name:||Overhead Power Lines||Conductor:||Copper Conductor|
|STANDARDS:||ASTM - B 231 Metric Units, ASTM - B 231, TS IEC 1089, DIN 48201, BS 215, UNE 21.018||APPLICATION:||Power Transmission And Distribution Lines|
|Feature:||High Electrical Conductivity||Size:||Custom|
overhead power cable,
power transmission lines
High Electrical Conductivity Overhead Power Lines For Power Transmission
A conductor is one of the most important components of overhead lines. Selecting a proper type of conductor for overhead lines is as important as selecting economic conductor size and economic transmission voltage. A good conductor should have the following properties:
Copper was the preferred material for overhead conductors in earlier days, but, aluminum has replaced copper because of the much lower cost and lighter weight of the aluminum conductor compared with a copper conductor of the same resistance. Following are some materials that are good conductors.
Types of Conductors
As it is already mentioned above, aluminum conductors have an edge over copper conductors considering combined factors of cost, conductivity, tensile strength, weight etc. Aluminum conductors have completely replaced copper conductors in overhead power lines because of their lower cost and lower weight. Though an aluminum conductor has larger diameter than that of a copper conductor of same resistance, this is an advantage when ‘Corona’ is taken into consideration. Corona reduces considerably with increase in the conductor diameter. Following are four common types of overhead conductors that are used for overhead transmission and distribution to carry generated power from generating stations to the end users. Generally, all types of conductors are in stranded form in order to increase the flexibility. Solid wires, except for very small cross sectional area, are very difficult to handle and, also, they tend to crystallize at the point of support because of swinging in winds.
AAC : All Aluminum Conductor
This type is sometimes also referred as ASC (Aluminum Stranded Conductor). It is made up of strands of EC grade or Electrical Conductor grade aluminum. AAC conductor has conductivity about 61% IACS (International Annealed Copper Standard). Despite having a good conductivity, because of its relatively poor strength, AAC has limited use in transmission and rural distribution lines. However, AAC can be seen in urban areas for distribution where spans are usually short but higher conductivity is required.
AAAC : All Aluminum Alloy Conductor
These conductors are made from aluminum alloy 6201 which is a high strength Aluminum-Magnesium-Silicon alloy. This alloy conductor offers good electrical conductivity (about 52.5% IACS) with better mechanical strength. Because of AAAC’s lighter weight as compared to ACSR of equal strength and current capacity, AAAC may be used for distribution purposes. However, it is not usually preferred for transmission. Also, AAAC conductors can be employed in coastal areas because of their excellent corrosion resistance.
ACSR : Aluminum Conductor, Steel Reinforced
ACSR consists of a solid or stranded steel core with one or more layers of high purity aluminum (aluminum 1350) wires wrapped in spiral. The core wires may be zinc coated (galvanized) steel or aluminum coated (aluminized) steel. Galvanization or aluminization coatings are thin and are applied to protect the steel from corrosion. The central steel core provides additional mechanical strength and, hence, sag is significantly less than all other aluminum conductors. ACSR conductors are available in a wide range of steel content – from 6% to 40%. ACSR with higher steel content is selected where higher mechanical strength is required, such as river crossing. ASCR conductors are very widely used for all transmission and distribution purposes.
ACAR : Aluminum Conductor, Alloy Reinforced
ACAR conductor is formed by wrapping strands of high purity aluminum (aluminum 1350) on high strength Aluminum-Magnesium-Silicon alloy (6201 aluminum alloy) core. ACAR has better electrical as well as mechanical properties than equivalent ACSR conductors. ACAR conductors may be used in overhead transmission as well as distribution lines