Suspension types insulators are also called as string insulator or disc insulators. The suspension type of insulator is sometimes also called disc insulator. Which separates the transmission line from the tower.
Cross section of suspension type porcelain insulator used
The cost of the suspension type insulators is very less as the voltage rating is high.
Due to the limitations for higher voltage in pin type insulators, suspension insulator types are employed in towers.
Suspension insulators consist of a number of porcelain discs that are connected to each other by metal chains in the form of strings. A suspension type insulator protects an over headed transmission line like a conductor. For voltages above 33 kv, therefore, suspension insulators are used. The suspension type insulators are generally used with the steel towers.
Suspension type insulatoris made from porcelain or polymer, also called porcelain suspension insulator and polymer suspension insulator, also known as composite long rod insulator for high voltage lines.
The suspension insulator is called as disc insulator. The suspension insulator voltage range is between 11 kv and 765 kv and can be mostly used in the overhead transmission system or line to provide more flexibility to the. Mostly, suspension insulator is made of glass or porcelain insulating materials. This is similar to suspension type insulators because it is used in an overhead transmission system but its specifications and working are somewhat different.
Hence for any operating voltage, a string of insulator can be used.
33 kv 11 kv 440 v 230 v. Because of the limitations of pin type insulators for higher voltage, suspension type insulators are used. What is the use of a suspension insulator? Power systemssuspension type insulators are used for voltage beyond.
Size and number of actual weathersheds will vary.
There are 5 types of insulators used in. Mostly, suspension insulator is made of glass or porcelain discs connected in series by metal links in the form of a string. Horizontally suspended suspension insulators that can handle large mechanical stresses such as a river crossing. Suspension insulators are used in two or more configurations depending on the transmission voltage and the consumption.
Suspension type insulators are used for voltage beyond1kv transmission and distribution lines with high mechanical strength.
Hence the transmission voltage is more than 50 kv, the suspension type insulators are preferred. Mostly in the transmission line, it is placed in bend otherwise arm place. The main types of insulators used for overhead lines are. Suspension insulator is also known as disc insulator.
Strain insulator also used beyond the 33kv lines.
Suspension type insulator consists of one or more insulator units connected together to form a string and hanged to the cross arm of the supporting structure or tower and carry a power conductor at its lowest extremity. It requires less maintenance as compared to other insulator types. The main function of a suspension insulator is to support the transmission line on the tower. Interconnected porcelain discs capable of transmitting higher voltages.
These insulators consist of a number of porcelain discs connected in series by metal links in the form of a string.
The suspension insulator is mainly made of sealed materials made of glass or porcelain. Insulator, suspension, polymer for 115 kv nominal systems note: The pin insulator has a simple construction. They are further classified into two types, they are.
The pin insulator supports the wire at the top or at the one side as shown in fig.
The voltage capacity of the strain insulator is 33kv. For example, for 66kv 6 number of discs are required. Suspension type insulator includes one or more insulator parts connected together in series to form a string, and they are hanged to the cross arm of the tower or supporting structure and carry a power conductor at its lowest extremity. Used on straight running transmission lines to transmit voltages upto 33 kv.
Suspension type insulator being economical as compared to pin type insulator for high voltage overhead transmission line each insulator disc is designed to operate for 11kv.
It is supported with a steel bolt or pin which is fixed on the cross arm. Suspension insulator or disc or string insulators. Materials such as porcelain or glass are used in the manufacture of these insulators. It plays an important role in the safe supply of electricity.
Type of insulators used in transmission lines.
50 hz, 11 kv distribution system, each of the conductors is suspended by an insulator string having two identical porcelain insulators. The voltage capacity of this insulator ranges from 11 kv to 765 kv. Suspension type insulators are used for voltages beyond. This type of insulator is used in the high voltage overhead distribution line.
As the pin insulators cannot be used if the voltage is more than 50kv.
It operates at above 33kv and overcomes the limitation of pin type insulator. It is also called a hewlett type insulator.
