High Voltage Insulators Types

But what types of high voltage tests can you perform on insulators.

High voltage insulators types.

Hence overhead power lines are always supported on insulators mounted on their support poles towers. In all applications the insulation of the cable must not deteriorate due to the high voltage stress ozone produced by electric discharges in air or tracking. Pin type insulator can be one part two parts or three parts type depending upon application voltage. Of course the power line won t even work in that case.

The cost of pin type insulator increases rapidly as the working voltage is increased. The pin insulator has a simple construction. This kind of insulator is used in distribution systems. In order to relieve the line of excessive tension strain insulators are used.

Overhead line insulators it is obvious that if overhead power lines are not properly insulated from their support poles towers the current will flow towards the ground through the poles towers which also become hazardous. Strain insulator are widely used where the tension load of conductor is higher. It requires less maintenance as compared to other insulator types. Therefore in this types of insulators in transmission lines insulator is not economical beyond 33 kv.

Conductors for lower voltages in distribution may have some insulation but are often bare as well. 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. Tests on insulators are roughly divided into three groups. Insulating supports called insulators are required at the points where they are supported by utility poles or transmission towers insulators are also required where the wire enters.

For high voltages 33 kv it is a usual practice to use suspension type insulators shown in fig. Overhead conductors for high voltage electric power transmission are bare and are insulated by the surrounding air. Let s take a look at each of these in more detail. Type tests sample tests and routine tests.

For low voltage lines 11 kv shackle insulators are used as strain insulators. The suspension insulator is called as disc insulator. Mostly suspension insulator is made of glass or porcelain insulating. Pin insulators are the earliest developed overhead insulator but are still commonly used in power networks up to 33 kv system.

The discs of strain insulators are used in the. It is designed with a high mechanical strength material. 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. The voltage capacity of this insulator is 11kv.