Types of Overhead Conductor

Conductor is a physical medium to carry electrical energy form one place to other. It is an important component of overhead and underground electrical transmission and distribution systems. The choice of conductor depends on the cost and efficiency. An ideal conductor has following features.
  1. It has maximum electrical conductivity.
  2. It has high tensile strength so that it can withstand mechanical stresses.
  3. It has least specific gravity i.e. weight / unit volume.
  4. It has least cost without sacrificing other factors.

Types of Overhead Conductor

In early days copper ‘Cu’ conductors was used for transmitting energy in stranded hard drawn form to increase tensile strength. But now it has been replaced by aluminum ‘Al’ due to following reasons:
  1. It has lesser cost than copper.
  2. It offers larger diameter for same amount of current which reduces corona.

Corona: is ionization of air due to higher voltage (usually voltage above critical voltage) which causes violet light around the conductor and hissing sound. It also produces ozone gas therefore it is undesirable condition.

Aluminium also has some disadvantages over copper i.e.

  1. It has lesser conductivity.
  2. It has larger diameter which increase surface area to air pressure thus it swings more in air than copper so larger cross arms required which increases the cost.
  3. It has lesser tensile strength ultimately larger sag.
  4. It has lesser specific gravity (2.71gm/cc) than copper (8.9 gm/cc) cc = cubic centimeter.
Due to lower tensile strength aluminium is used with some other materials or its alloys

AAC (All Aluminium Conductor)

ACAR (Aluminium Conductor, Aluminium Reinforce)

AAAC (All Aluminium Alloy Conductor)

aaac conductor

ACSR (Aluminium Conductor Steel Reinforced)

acsr conductor

IACS (International Annealed Copper Stand)

New Articles Series and Parallel Inductors Electric PowerMeasurement of LossShunt ReactorIR MeasurementAmpere's Circuital LawClosely Related Articles Power Cable Overhead ConductorTesting of Power CableResistance TestInsulation Thickness TestAnnealing Test Tensile TestPersulphate TestWrapping TestCapacitor BankTypes of Capacitor BankTesting of Capacitor BankRating of Capacitor BankShunt Capacitor Switchable Capacitor Bank Location of Capacitor BankResistance of EarthSystem EarthingEquipment Earthing InsulatorTypes of InsulatorInsulation CoordinationInsulator TestingProperties of InsulationTypes of ReactorApplications of ReactorsShunt ReactorConstruction of Shunt ReactorTests of Shunt ReactorMeasurement of ReactanceMeasurement of ResistanceMeasurement of LossPetersen CoilSubstationSubstation LayoutMobile Substation Load CurveHVDC TransmissionTransmission TowerTower ErectionTransmission Tower FoundationTowers in Different SoilsCorona EffectFerranti EffectAdvantages of Three Phase SystemInductance of Single ConductorInductance in Three Phase LinePower System StabilityLoad Flow AnalysisTransient StabilityFlexible AC Transmission SystemsTariff of ElectricityPower FactorSkin EffectInductance of Single Phase SystemAuto RecloserLoad Flow and Y BusEqual Area CriterionSteady State StabilityElectrical TransmissionTransmission LineTransmission VoltagesShort Transmission LineMedium Transmission LineLong Transmission LinePerformance of Transmission LineABCD ParametersSagSurge Impedance LoadingAdmittanceAdvantages of Bundled ConductorsBundled ConductorsGround Clearance Articles Categories Basic Electrical Technology Circuit and Network Theories Electrical Laws Engineering Materials Battery Technologies Illumination Engineering Electrical Power Generation Electrical Power Transmission Electrical Switchgear Electrical Protection Electrical Measurement Control System Electrical Transformer Electrical Motor Induction Motor DC Motor Synchronous Motor Electrical Generator Electrical Drives Electronics Devices Power Electronics Digital Electronics Questions MCQ