Metro Line 3 Power Distribution Solution – Cairo, Egypt
Project Name: Cairo Metro Line 3 – Phase 4 Power Supply System
Country: Egypt
Supplied Products:
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66/11kV 40MVA Oil-Immersed Power Transformers (2 units)
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KYN28-12 11kV Indoor Switchgear Panels (54 panels)
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VS1-12 Indoor Vacuum Circuit Breakers (withdrawable type)
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RMU (Ring Main Units) for underground distribution (22 sets)
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11/0.4kV Prefabricated Containerized Substations (8 units)
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GCS/MNS Low Voltage Switchgear Panels (72 panels)
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Reactive Power Compensation Panels (18 units)
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Traction Power Supply Cabinets (750V DC output for trains)
Client: Egyptian National Authority for Tunnels (NAT) – via EPC Contractor Arab Contractors & VINCI
Application: Medium-voltage and low-voltage distribution for metro traction substations, signaling, station loads, and auxiliary systems
Project Overview:
QZ Switchgear supplied a complete traction power and auxiliary distribution package for Cairo Metro Line 3 expansion. The project involved delivering high-reliability substations for train traction, underground stations, signaling equipment, passenger facilities, and depot areas.
Technical Highlights:
Traction Power Supply
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66/11kV transformers feeding into traction substations
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Dedicated 750V DC traction cabinets to power metro trains
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Redundant feeder design to ensure no single-point failure
Medium Voltage Side
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KYN28-12 switchgear with VS1 vacuum breakers for incomer, feeder, and bus coupler applications
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RMUs deployed in underground tunnels for compact distribution
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IEC 62271 compliant, with relay protection integrated into metro SCADA
Low Voltage Side
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LV switchgear panels serving station lighting, escalators, HVAC, fire safety, ticketing, and depot facilities
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Reactive compensation panels improved power factor and reduced energy costs
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Prefabricated substations shortened civil construction time
Client Benefits:
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High reliability: Redundant design ensures continuous traction power and passenger safety
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Customized engineering: Compact RMUs solved underground space constraints
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Efficient execution: Prefabricated substations reduced construction schedule by 4 months
