Hence the transmission voltage is more than 50 kv, the suspension type insulators are preferred. The part sec tion of a pin type insulator is shown in fig. Mostly, suspension insulator is made of glass or porcelain discs connected in series by metal links in the form of a string.
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There are several types of insulators in transmission lines but the most commonly used are pin type, suspension type, strain insulator and shackle insulator.
However, when the voltage exceeds 33 kv, suspension type insulators are recommended.
Because of the limitations of pin type insulators for higher voltage, suspension type insulators are used. Fog type disc suspension porcelain insulators fig.1 fig.2 fig.3 cat. The main types of insulators used for overhead lines are. Due to the type of their disc, each insulator of a suspension string is known as a disc insulator.
We can say multiple disc insulators are connected together to make the suspension type insulator.
Irresolution's see our other listings customer support if you have questions about the product or your order please contact us via messages for assistance. (b) model of tower insulator string in atpdraw. The voltage across the two insulators are. It shall be noted that the number of discs in suspension insulator can be increased or decreased by adding extra discs or removing a disc.
This type of composite unit also.
The pin insulator supports the wire at the top or at the one side as shown in fig. Suspension insulator or disc or string insulators. With the number of metalink links. V 3 = v 1 (1 + 3k + k 2 ).
This type of insulator is used within 33kv power distribution systems.
Suspension types insulators are also called as string insulator or disc insulators. Each insulator is made of a disc insulator. On the type of material of the insulator, the weather of the zone, the type and level of pollution, as well as the working voltage of the insulator [9]. V = v 1 + (1 + k)v 1 + v 1 (1 + 3k + k 2) v = v 1 (3 + 4k + k 2).
Sumathi 1 m.tech., (ph.d) ,.
Each disc can carry the voltage 11kv(up to 15kv also). It operates at above 33kv and overcomes the limitation of pin type insulator. The lower control arm has one point of attachment to the car frame. How suspension insulator looks the suspension type insulator.
There are 3 types of coil spring front suspension.
In the second type, the coil spring is located between the upper and lower control arms. Like a suspension insulator, a strain insulator. Numbers of insulators in series are joined to form a string in the suspension insulator and the line conductor is supplied by the lowest insulator. These insulators are made with glass otherwise porcelain.
The strain insulator is similar to the suspension insulator type.
Pin insulators are the earliest developed overhead insulator, but are still commonly used in power networks up to 33 kv system. It is supported with a steel bolt or pin which is fixed on the cross arm. For low voltage power transmission applications, a pin type insulator is useful. An insulator that is used to isolate a wire from physical support such as a pin on a utility pole or tower is known as pin type insulator.
It is a combination of multiple insulators connected in series to form a string.
A suspension insulator is basically a string of number of porcelain disc connected in series though metallic link. Pin type insulator can be one part, two parts or three parts type, depending upon application voltage. Because, if any of the disc damages from the suspension insulator, the remaining disc will operate. 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.
The damaged disc can be replaced, easily.
The cost of the suspension type insulators is very less as the voltage rating is high. Suspension insulators are most beneficial than the other insulator. As the name suggests, it is arranged on a pin where the conductor connected to it. Suspension insulators or suspension strings are developed by attaching a number of closed insulators in series using metallic links.
As the pin insulators cannot be used if the voltage is more than 50kv.
The suspension insulator consists mainly of two parts one is the cross arm and the other is the insulator which we also know as the disc insulator. (iii) from the above equations (i), (ii) & (iii), it is clear that the voltage across the top disc is minimum while voltage across the disc nearest to the conductor is maximum, i.e. Download scientific diagram | flow chart of lifetime estimation for porcelain suspension type insulator from publication: 50 hz, 11 kv distribution system, each of the conductors is suspended by an insulator string having two identical porcelain insulators.
In the first type, the coil spring is located between the upper and lower control arms.
V = v 1 + v 2 + v 3. A suspension type insulator protects an over headed transmission line like a conductor. So, in a 33kv system, three discs are used.
