In this article we will discuss about:- 1. Introduction to Overhead Line Insulators 2. Insulator Materials 3. Factors 4. Failure. Introduction to Overhead Line Insulators: The overhead line conductors are bare and not covered with any insulating covering/coating. The line conductors are, therefore, secured to the supporting structures by means of insulating fixtures, called the insulators, in order that there [...]
The string efficiency indicates the extent of the wastage. Though string efficiency can never be made 100 per cent, an improvement in its value is necessary so as to reduce the wastage to the minimum. Some methods used for this purpose are given below: Method # 1. By Using Insulators with Larger Discs or by Providing Each Insulator Unit with [...]
Various types of insulators used for overhead transmission and distribution lines are described below: Type # 1. Pin Insulators: This type was amongst the earliest designs, and used for supporting line conductors. It provides the most economic, simple and efficient method of conductor and bus-bar support for voltages up to and including 33 kV. Modern pin type insulators are very [...]
For overhead lines operating at high voltages (33 kV and above) use of number of discs connected in series, through metal links, is made. The whole unit formed by connecting a number of discs in series is known as string of insulators. The line conductor is secured to the bottom disc of the string and the top disc is connected [...]
The following points highlight the six main types of insulators generally used in low or medium voltage. The types are: 1. Pin Insulators 2. Shackle Insulators 3. Stay-Insulators or Guy-Insulators 4. Reel Insulators 5. Egg-Type Insulators 6. Aerial Fuse. Type # 1. Pin Insulators: An insulator set on a pin or a bolt is called a 'pin insulator'. Both ends [...]