Disconnector Switches and Earth Switches

Standards IEC 62271-102 High-voltage alternating current disconnectors and earthing switches

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).

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

1. Center break disconnect switch

245kV Center break disconnect switch

1. Center break “Vee” disconnect switch

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

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

3. Vertical break disconnect switch

3. Vertical break folding arm disconnect switch

4. Single side break disconnect switch

5. Pantograph disconnector

6. Semi-Pantograph disconnect switch

7. Earth Switch

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

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

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

Outline Drawing

Outline Drawing