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What is bus post insulator?

What is bus post insulator?

POST INSULATORS. Post insulators are used as supports for bus-bars in transformer sub-station yards, in switchgear as support for breakers, and for capacitor banks. These insulators are generally subjected to bending, torsion and compression forces in service.

What is post type insulator?

Post insulator is a High Voltage (HV) type of insulator which is designed based on the IEC, ANSI and other standards. They can be used in a power system of up to 1100 kV. The post insulator is constructed from composite materials (silicone rubber) or one piece of porcelain.

What are station post insulators used for?

Extra-High strength porcelain station post insulators are used for projects that involve extremely heavy mechanical loads. They meet or exceed all ANSI standards in both electrical and mechanical characteristics for their voltage class.

What is polymer insulator?

Polymer insulators have a core composed of a fiberglass rod covered by polymer weather sheds. Manufactures use various shed materials, designs, and construction methods. Basic polymer shed materials used are silicone rubber, EPM, EPDM, CE, and polytetrafluroethylene (PTFE or Teflon).

What is BPI in substation?

Earthing of Bus Post Insulator Each bus post insulator or BPI is connected to the main earthing grid via two risers.

Where are polymer insulators used?

These electrical insulating materials are widely used in the electrical and electronics sectors as elements to isolate electricity in protective equipment for living beings or in electrical circuits. For more details about the polymer insulator characteristics, check out our full article.

What are the disadvantages of polymer insulators?

The composite insulator has many advantages, but also disadvantages, e.g., the loss of hydrophobicity, the risk of the core rod becoming brittle and breaking, lightning strike and birds droppings, which can all make composite insulators lose efficiency.

What earthing is found in 11KV substations?

Pipe earthing is the most common type used for residential quarters and strip earthing is used for 11 kV substation.

What is capacitor bank in substation?

Capacitor Bank is a combination of numerous capacitors of similar rating that are joined in parallel or series with one another to collect electrical energy. The resulting bank is then used to counteract or correct a power factor lag or phase shift in an AC power supply.

What type of insulator is 33kv?

Pin insulator
Shackle insulator cons

Insulator Voltage capacity Use
Pin insulator < 33 kV Distribution system
Post insulator 11 kV to 765 kV Substation system
Suspension insulator > 11 kV (High) Transmission system
Shackle insulator < 33 kV Distribution system

What type of insulator is used for 11kv line?

In a 11 kV system we generally use one part type insulator where whole pin insulator is one piece of properly shaped porcelain or glass. As the leakage path of insulator is through its surface, it is desirable to increase the vertical length of the insulator surface area for lengthening leakage path.

What type of insulator is used for 11kV line?

#5 Suspension Insulators

The Advantages of Suspension Insulator Disadvantages of Suspension Insulator
Each unit can operate on a voltage of around 11kV. Insulator string is expensive as compared to pin-type and post-type insulators.

What is the other name of polymer insulator?

composite insulator
What is the other name of Polymer Insulator? Explanation: It is also known as composite insulator. It is known as composite insulator because it consists of both core and the weather sheds in them.

What insulators are used in transmission lines?

There are 5 types of insulators used in transmission lines as overhead insulation:

  • Pin Insulator.
  • Suspension Insulator.
  • Strain Insulator.
  • Stay Insulator.
  • Shackle Insulator.

What is GI earthing?

In areas with high soil resistivity, GI (Galvanized Iron) Earthing Electrodes give a low-impedance ground. The method dissipates lightning energy and other dangerous electrical fault currents, even in sandy or rocky soil conditions, when used in conjunction with Reflow Grounding Minerals.