High Voltage Power Transmission Line Insulators and their Types


The main concept of any insulator is to breakdown electrical conductivity of high voltage power transmission or distribution line form transmission or distribution tower. Insulators are main component of Transmission Line and there are major three types of insulators use for overhead insulator such as.

  1. Pin Insulator
  2. Suspension Insulator
  3. Strain Insulator

Pin Insulators

Pin Insulator is widely use for overhead high voltage power transmission lines and these types of insulators much popular in 33kv distribution lines. Pin insulators are mainly classified in to two according to their manufacture materials. Most of Pin insulators manufactured by use of Glass and Porcine materials .For higher voltages of transmission line use more numbers of pin insulators compare to low voltage transmission lines.Pin insulators are also use for higher and lower voltage transmission and distribution lines in Patrice. The type of pin insulators use for higher voltage line is normally known as Post type of insulators. Post insulators have several numbers of petticoats which higher than normal pin insulators which use for low voltage applications and the height of post insulator are also higher too.

Suspension Insulator

Suspension Insulator are the most commonly used insulator types in High-voltage transmission applications.  Suspension Insulator has higher economical advantage for high voltage application compare to other insulators. There are so many advantages of Suspension insulators over other . Normal voltage ratings of suspension insulators are 11kV and by number of discs can be adjusted for relevant transmission line voltages. For example for 132 kV transmission line use 132kv/11 kv = normally 13 discs. Suspension Insulator has greater flexibility over other insulator types. If any insulator disc is damage in Transmission line it is much easily replace even the Transmission line is energized.The Suspension insulators also has great capability of taking cares of the tension of the conductor at transmission line compare to other types of conductors.

Strain Insulator

Strain Insulator are widely used where the tension load of conductor is higher.  The most important factor of strain insulator is a mechanical strength.Stay Insulators and Shackle insulators are part of Strain Insulators and these types of insulators widely use where high mechanical strength is necessary in low voltage applications. These are the main three types of insulators which use widely for power transmission and distribution lines.

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