ACSR conductors have a larger diameter than AAC and AAAC due to their steel core, and as a result, they can achieve a greater corona limit, providing them an advantage for high voltage overhead lines. ACSR is also used for local distribution, either hanging from wooden poles or by other means. The term "ACSR" originally referred to aluminum conductors with a copper skin, but this type of cable is now obsolete.
The introduction of aluminum cables in the mid-1950s was initially met with skepticism by line crews who were used to working with copper wire. But the early aluminum cables proved to be more durable than copper when exposed to weather conditions, so they began to replace copper wires on major transmission lines. By the late 1950s, almost all new transmission lines were made with aluminum conductors because they were easier to install and maintain than copper wires. The only exception was where ground burial was not possible or desirable due to environmental concerns or physical limitations (e.g., near houses).
The first aluminum cable used on high-voltage lines was developed by General Cable Corporation (now part of Tyco Electronics) in 1954. It was an improvement over previous types of cable because it had a thicker aluminum insulation layer which provided better electrical protection than normal commercial grade aluminum wire. However, this cable still had a metal core inside the insulation that allowed it to carry current just like regular copper wire.
Except for Dog Conductors, ACSR Conductors 3 to 7 are all ACSR Conductors and are widely used on 11kv lines. The ACSR 7 is used as a ground wire in some cases.
The ACSR 3 is used as a static-discharge wire. It is also called a "dog" or "static-discharge wire". The ACSR 3 is always white or grey. If it is not available, any other color will do. It is required on all new construction and where modification of an existing system will not be made within six months of completion. The ACSR 3 should be placed along the base of light poles or inside street lights so that it does not have to be re-melted when replacement is needed due to oxidation or other damage.
The ACSR 4 is used as a protective conductor to protect people from contact with power lines. It is also called a "third-wire" or "dead-conductor" wire. The ACSR 4 is colored black or red according to the national electrical code. It is required between all distribution transformers and feeder terminals.
The ACSR 5 is used as a protective conductor to protect equipment from voltage spikes on the third phase.
These overhead aluminum conductors serve as transmission and distribution cables for power. Depending on the application, all aluminium conductors are made up of one or more strands of aluminium wire. AAC is a refined aluminum stranded conductor having a metal purity of at least 99.7%. It is primarily used in power transmission and distribution applications where it provides excellent electrical conductivity and high resistance to corrosion.
Aluminium cable is manufactured by twisting several strands of thin metal wires together. The number of strands in each conductor is indicated by its size. Conductor size ranges from 18 to 24 awg for general purpose use and range up to 14 gage for very large conductors such as those used in sub-stations.
The individual strands within the cable are not solid, like copper wire, but rather they are composed of many tiny filaments held together with a synthetic resin. This gives them greater strength and resisitivity to corrosion than solid metal wires of equal size would be. Also, the plastic covering prevents electrical equipment from shorting out other nearby cables.
Distribution lines have enough ampacity to supply light loads throughout their length. They usually run from 100 to 400 feet between poles or towers. Smaller distribution lines are used near the premises and larger ones are needed at remote locations away from the main body of the building. Distribution lines are designed to carry low current signals that feed electricity into various parts of the facility or residence.
What distinguishes AC power from DC electricity is that the voltage can be easily modified, making it more ideal for long-distance transmission. However, AC may also use capacitors and inductors in electronic circuits, opening up a wide range of applications. The fact that AC is less destructive than DC means that it is preferable for operating machinery and other devices that are sensitive to damage from high voltages or currents.
Alternating current allows for larger networks to be built due to its ability to flow around obstacles, while direct current (DC) requires wires to be laid out in an exact manner with nothing able to cross paths with them. This becomes important when trying to connect multiple houses together with only DC available as there would be no way to connect your house to your neighbor's circuit unless you had access to their wiring. This limitation does not exist with AC since anything in an AC circuit can be removed or added at any time without affecting anything else.
Another advantage of AC over DC is its ability to transmit energy over longer distances, since there is no risk of electrocution due to insulation breakdown with AC. This is particularly important for power companies which need to transmit electricity over large distances within their own network before being distributed to consumers.