PRESENTATION POWER SYSTEM

BY:

1) MUHAMMAD FARIZ BIN AZLAN 14DET14F1023

2)KHAIRUL AZMAN BIN JANTAN 14DET14F1026

3)MUHAMMAD AMAR FARHAN BIN MAD SALEH 14DET14F1047

4)MUHAMMAD HAFIZI BIN ISHAK 14DET14F1053

5)DANIEL FILDZA BIN ABDUL RAHMAN 14DET14F1059

LECTURE NAME : PUAN NOOR RAPIDAH BINTI BUJAL

Strain or Tension Insulator

Strain or tension insulators are designed for handling mechanical stresses at angle positions where there is a change in the direction of the line at termination of line.

Suspension insulator are arranged in a horizontal position.

Take the pressure off a conductor at the end of a transmission line, at a sharp corner or curve or over long river crossings

Strain insulators are typically used for higher voltage transmissions.

INSULATOR MATERIAL

1.Porcelain with glazed surface

2.Toughened glass3.Polymer Insulator

STRAIN INSULATOR

When there is a dead end ofthe line or there is corner orsharp curve, the line issubjected to greater tension. Inorder to relieve the line ofexcessive tension, straininsulators are used. For lowvoltage lines (< 11 kV)

However, for the high voltagetransmission lines, strain insulator consists ofan assembly of suspension insulators asshown in Figure. The discs of strain insulatorsare used in the vertical plane. When thetension in lines is exceedingly high, at longriver spans, two or more strings are used inparallel.

High tension electrical tranmission lines, with a field, building and and electrical substation in Berlin, Germany

Advantages of Tension/Strain Insulator1. Each strain disc is designed for normal voltage rating 11KV(Higher voltage rating 15KV), so by using different numbers of discs, a strain string can be made suitable for any voltage level.

2. If any one of the disc insulators in a strain string is damaged, it can be replaced much easily.

3. Mechanical stresses on the strain insulator is less since the line hanged on a flexible strain string.

Disadvantages of Tension/Strain Insulator1. Strain insulator string costlier than pin and post

type insulator.

2. Strain string requires more height of supporting structure than that for pin or post insulator to maintain same ground clearance of current conductor.

3. The amplitude of free swing of conductors is larger in strain insulator system, hence, more spacing between conductors should be provided.