1. Disconnector Switches and Earth Switches

2. Standards
IEC
High-voltage alternating current disconnectors and earthing switches

3. Defenition
Disconnectors are used for galvanic isolation of networks or sections of switchgear installations. As an independent air-insulated device, they form a visible isolating distance in their open position. They are suitable for switching small currents (< 0.5 A) or also larger currents if the voltage does not change significantly between the contacts of a disconnector pole during switching (commutation currents).

4. Type of Disconnectors Center break
Double end break (also sometimes called double side break)
Vertical break
Single side break
Pantograph
Semi-Pantograph
Earth Switch

5. 1. Center break disconnect switch

6. 245kV Center break disconnect switch

7. 1. Center break “Vee” disconnect switch

8. 2. Double end break (double side break) disconnect switch

9. 2. Double end break “Vee” (double side break) disconnect switch

10. 3. Vertical break disconnect switch

11. 3. Vertical break folding arm disconnect switch

12. 4. Single side break disconnect switch

13. 5. Pantograph disconnector

14. 6. Semi-Pantograph disconnect switch

15. 7. Earth Switch

16. Technical Specification
Type of disconnector
2. Class
3. Rated Voltage
4. Rated Frequency
5. Whether single phase or 3-phase group driving
6. Rated Lightning Impulse Withstand Voltage
a) To earth
b) Across the isolating distance
7. Rated Switching Impulse Withstand Voltage
b) across the isolating distance
8. Rated Power Frequency Withstand Voltage

17. Technical Specification
9. Rated Current
Rated short time withstand current
12. Type of interlock
Minimum clearance in air
a) Between poles when disconnector is closed
b) To earth
c) For isolating distance
14. Insulator
a) Type
b) Creepage distance

18. Technical Specification
15. Operating time
16. Mechanism:
a) Type of mechanism
b) Motor Type
c) Motor and control voltage
d) Heater voltage
f) Degree of protection of operating mechanism

19. Outline Drawing

20. Outline Drawing