Transcript Disconnector Switches and Earth Switches

Disconnector Switches and
Earth Switches
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Standards
• IEC 62271-102
High-voltage alternating current disconnectors
and earthing switches
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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).
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Type of Disconnectors
1. Center break
2. Double end break (also sometimes called double side break)
3. Vertical break
4. Single side break
5. Pantograph
6. Semi-Pantograph
7. Earth Switch
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1. Center break disconnect switch
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245kV Center break disconnect switch
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1. Center break “Vee” disconnect switch
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2. Double end break (double side break) disconnect switch
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2. Double end break “Vee” (double side break) disconnect switch
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3. Vertical break disconnect switch
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3. Vertical break folding arm disconnect switch
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4. Single side break disconnect switch
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5. Pantograph disconnector
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6. Semi-Pantograph disconnect switch
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7. Earth Switch
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Technical Specification
1.
2.
3.
4.
5.
6.
Type of disconnector
Class
Rated Voltage
Rated Frequency
Whether single phase or 3-phase group driving
Rated Lightning Impulse Withstand Voltage
a) To earth
b) Across the isolating distance
7.
Rated Switching Impulse Withstand Voltage
a) To earth
b) across the isolating distance
8.
Rated Power Frequency Withstand Voltage
a) To earth
b) Across the isolating distance
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Technical Specification
9.
10.
12.
13.
Rated Current
Rated short time withstand current
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
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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
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Outline Drawing
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Outline Drawing
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