These are insulators described briefly

1. ELECTRICAL ESTIMATING AND COSTING
SEMINAR ON
INSULATORS
BY – SARTHAK(874)

2. INSULATORS
• INSULATORS ARE THE DEVICE WHICH IS USED TO PROVIDE
INSULATION BETWEEN CONDUCTOR AND SUPPORT ARMS OF
POLES
• MATERIAL USED FOR MAKING INSULATORS
1. PROCELIAN
2. GLASS
3. POLYMER
4. CEREMIC
5. POLYVINYL CHLORIDE (PVC)

3. TYPES OF INSULATORS
1. PIN TYPE INSULATORS
2. SUSPENSION TYPE INSULATORS
3. STRAIN TYPE INSULATORS
4. SHACKLE TYPE INSULATORS
5. STAY INSULATORS
6. POST INSULATORS

4. PIN TYPE INSULATORS
• PIN TYPE INSULATORS ARE USED IN DISTRIBUTION SYSTEMS
• IT IS USED FOT THE VOLTAGES UPTO 33 KV
• THERE IS A GROOVE ON PIN TYPE INSULATORS
• THESE INSULATORS ARE MADE UP OF POLYMER AND
PROCELIAN MATERIAL

7. SHACKLE TYPE INSULATORS
• IT IS USED IN LOW VOLTAGE LINES OR DISTRIBUTION LINES
• IT IS ONLY USED TO MOVE OR TURN THE WIRES
• IT IS USED FOR THE ONLY 11KV IF VOLTAGE IS HIGH THAN WE
USE STRAIN TYPE INSULATORS
• IT CAN BE USED ON HORIZONTAL OR VERTICAL LINES

10. SUSPENSION TYPE INSULATORS
• IT IS MADE BY CONNECTED DISC INSULATORS IN SERIES
• I DISC = 11 KV MEANS IT CAN WITHSTAND THE VOLTAGE UPTO
11 KV
• IT IS CONNECTED VERTICALLY IN TRANSMISSION LINES
• IT IS USED FOR 765KV LINE DEPENDS ON NUMBER OF DISC
CONNECTED

12. STRAIN INSULATOR
• IT IS USED WHEN WE NEED TO MOVE OR TURN TRANSMISSION
LINES AT HIGH VOLTAGE
• FOR LOW VOLTAGES WE USE SHACKLE TYPE INSULATORS AND
FOR HIGH VOLTAGE WE USE STRAIN TYPE INSULATORS
• IT CAN BE USED HORIZONTALLY DEPENDS ON THE
APPLICATIONS
• IT CAN ALSO USE UP TO 765 LV LINE WHICH DEPENDS ON
NUMBER OF DISC

13. EGG INSULATORS
• IT IS USED IN POLE SUPPORTING WIRES
• STAY INSULATORS ARE PRIMARILY USED TO PREVENT STAY
WIRES FOR BECOMING ENEGRISED FROM ACCIDENTLY
BECOMING LIVE WIRES
• STAY INSULATORS ARE MOUNTED AT THE HEIGHT OF ATLEAST
3 METERS FROM GROUND LEVEL

15. POST INSULATORS
• THESE ARE THE INSULATORS WHICH ARE USED TO GIVE
SUPPORTS TO BUS BARS
• IT IS ALSO USED TO SUPPORT SWITCH GEAR AND BREAKERS