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Transcript 
MV SWITCHGEAR
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STANDARDS
• IEC 62271-200
High-voltage switchgear and controlgear –
AC metal-enclosed switchgear and controlgear for rated
voltages above 1 kV and up to and including 52 kV
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Metal-enclosed Switchgears
Circuit Breaker Compartment
Busbar Compartment
Cable Compartment
LV Compartment
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Circuit Breaker Compartment
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Busbar Compartment
• Main busbar system
• Branch busbar connections
• Through insulators for segregation of
neighboring busbar compartments
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Cable Compartment
• Earthing switch
• Busbar branch connections
• Power cables
• Surge arresters
• Instrument transformers (current
transformers, voltage transformers)
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Low-Voltage Compartment
• Microprocessor relay protection
• Automation and SCADA elements
• Auxiliary wiring (control, supply, signalling circuits)
• Transit auxiliary wiring
• Local control and signalling elements
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Internal Construction
4 LV compartment
2 Main busbar compartment
1 Circuit Breaker compartment
3 Cable compartment
5 Arc duct/channel
7 Voltage transformers
6 Current transformers
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8 Earthing switch
Internal Arc Protection
Release of hot gases from
each compartment in case of
internal arc fault
Rear
Front
Protection
Protection
Lateral Protection
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Single Line Diagram
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IF & OF – Incoming & Outgoing Feeder
6 Cables
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Withdrawable
VT
Fixed VT + 6cables
BC – Bus Coupler
Left/Right Versions
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BR – Bus Riser
Metering Version With VT Truck
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Version With No VT Truck
Rating
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Gas-Insulated Switchgear
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Panel Components
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Single Line Diagram
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IF & OF
BC + BR
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