What Type Of Insulator Will Be Selected For High Voltage Application?


Insulators used for high-voltage power transmission are made from glass, porcelain or composite polymer materials.

Porcelain insulators are made from clay, quartz or alumina and feldspar, and are covered with a smooth glaze to shed water.

Which type of line insulator is used for terminating on corner poles?

Shackle Type Insulators: The shackle insulators are used in low voltage distribution lines (LT lines). They are also called spool insulators. These insulators are used to isolate the live conductor from pole and are mounted in every pole of electrical line.

Which type of insulator are used in 132kv transmission line?

Suspension Insulator

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.24 May 2014

What is the best electrical insulator material?

In the electrical field, the purpose of any insulating material is to separate electrical conductors without passing current through it. Material like PVC, glass, asbestos, rigid laminate, varnish, resin, paper, Teflon, and rubber are very good electrical insulators.

Why insulators are used in overhead lines?

Insulators puts a completely non-conductive material between the power lines and the support structure holding the power lines to prevent this. The higher the voltage the more insulation is needed as the potential difference result in electricity arc through the air to the conducting surface.

What are two types of insulators?

There are several types of insulators but the most commonly used are pin type, suspension type, strain insulator and shackle insulator.24 Aug 2011

What is creepage distance?

Creepage distance means the shortest distance along the surface of a solid insulating material between two conductive parts. The values of table “Creepage distances to avoid failure due to tracking” are based upon existing data and are suitable for the majority of applications.

What is shackle type insulator?

Shackle Insulators are used in low voltage distribution lines. They are otherwise known as spool insulators. Shackle Insulators are used at the end of distribution lines or at sharp. turns where there is excessive tensile load on the lines.

What materials are used as transmission lines?

Materials Use for Transmission Lines

  • Copper.
  • Aluminum.
  • Cadmium – Copper alloys.
  • Phosphor bronze.
  • Galvanized steel.
  • Steel core copper.
  • Steel core aluminum.

27 Jul 2018

What is post type insulator?

Post Type Insulators. Post Type insulators are usually used in substations. These insulators are constructed in the form of a cylinder. The circular surface of the cylinder is corrugated to increase the leakage distance. They are mounted on pedestals.

What is the strongest insulator?


What is the best insulator?

A: The best insulator in the world right now is most probably aerogel, with silica aerogels having thermal conductivities of less than 0.03 W/m*K in atmosphere. of aerogel preventing ice from melting on a hot plate at 80 degrees Celsius! Aerogel has its amazing properties because it’s mostly made out of air.8 Feb 2015

Which metal is the best insulator?

Metals such as copper typify conductors, while most non-metallic solids are said to be good insulators, having extremely high resistance to the flow of charge through them.

What is an insulator example?

Examples of Conductors and Insulators

Examples of conductors include metals, aqueous solutions of salts (i.e., ionic compounds dissolved in water), graphite, and the human body. Examples of insulators include plastics, Styrofoam, paper, rubber, glass and dry air.

What is the importance of insulators?

Electrical Insulators

Insulators are important to keep us safe from electricity. The wire that carries electricity to your computer or television is covered with a rubber-like insulator that protects you from getting electrocuted. Good insulators include glass, the air, and paper.

What are the characteristics of insulators?

Insulators are materials that have just the opposite effect on the flow of electrons. They do not let electrons flow very easily from one atom to another. Insulators are materials whose atoms have tightly bound electrons. These electrons are not free to roam around and be shared by neighboring atoms.

Is wood a good conductor of electricity?

Wood and plastic are bad conductors of electricity because electrons in them are bound to their respective ‘parent’ atoms and are not free to move. Therefore, wood or plastic does not possess freely movable charges; hence they cannot conduct electricirty.

Where do we use insulators?

Insulators work as protectors. They may protect heat, sound and the passage of electricity. Thermal insulators, sound insulators and electrical insulators are used for various reasons, from keeping houses warm to protecting electrical wires and soundproofing rooms.

What is flashover voltage?

flashover voltage. [′flash‚ō·vər ‚vōl·tij] (electronics) The voltage at which an electric discharge occurs between two electrodes that are separated by an insulator; the value depends on whether the insulator surface is dry or wet. Also known as sparkover voltage.

Why do we need creepage distance?

The creepage distance for insulators is shortest distance along the insulator surface between the metal parts at each end of the insulator. Creepage distance can also be refer as leakage distance for insulators. If the surface of the insulator is clean, smooth and well gazed the dust particles tend to fall down.

What is protected creepage distance?

Creepage distance of insulator, also called the leakage distance, is the shortest distance between two conductive parts measured along the insulator surface. What is the protected creepage distance of an insulator?

What is the minimum safe distance from power lines?

This is the most important rule: Work at a safe distance from all power lines. The Occupational Safety and Health Administration (OSHA) requires that equipment be kept at least 10 feet away from power lines with voltages up to 50kV.