Which type of conductor is not used in cables for transmission lines?
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Which type of conductor is not used in cables for transmission lines?
Although steel has very high tensile strength, steel conductors are not suitable for transmitting power efficiently due to the poor conductivity and high resistance of steel.
What is HTLS conductor?
High Temperature Low Sag Conductors (HTLS) can withstand operating temperatures of up to 210 °C, thus carrying higher power compared to conventional conductors.
Why are high transmission lines sag?
The lines are often heavily loaded because of increased power consumption, and the conductors, which are generally made of copper or aluminum, expand when heated. That expansion increases the slack between transmission line structures, causing them to sag.
Which conductor has low sag?
High Tension Low Sag (HTLS) Conductor for Overhead
| Length | 3600 |
|---|---|
| Material | Aluminium |
| Conductor Type | Stranded Conductor |
| Product Type | HTLS Conductor |
| Usage/Application | Overhead |
What are high temperature conductors?
TEMPERATURE CONDUCTORS Conductors with high temperature performance are electrically and dimensionally very similar to the conventional ACSR conductor, with its differential characteristic being its lower heat expansion coefficient.
What are the factors affecting the sag in a transmission line?
Factors affecting the sag Span – Sag is directly proportional to the square of the span length. Longer span gives more sag. Tension -The sag is inversely proportional to the tension in the conductor. Higher tension increases the stress in the insulators and supporting structures.
How hot do transmission lines get?
Operating temperatures can be 120°C or over 200°C with some of the more exotic (and expensive) cables used today. Also, high operating temperatures accelerate creep, which is a gradual expansion of the cable with time. As creep progresses the cable will sag more and it might impact a tree or structure (bad).
Why are high voltage transmission lines not insulated?
Most of the hundreds of thousands of miles of high-voltage transmission lines in this country are made solely of metal—either aluminum or aluminum wrapped around a steel core. Adding a layer of insulation to every line would be pricey and has been deemed unnecessary given how high the lines are off the ground.
Why insulator is used in transmission line?
An insulator gives support to the overhead line conductors on the poles to prevent the current flow toward earth. In the transmission lines, it plays an essential role in its operation. The designing of an insulator can be done using different materials like rubber, wood, plastic, mica, etc.