Metro Line 3 Power Distribution Solution – Cairo, Egypt
Project Name: Cairo Metro Line 3 – Phase 4 Power Supply System
Country: Egypt
Supplied Products:
66/11kV 40MVA Oil-Immersed Power Transformers (2 units)
KYN28-12 11kV Indoor Switchgear Panels (54 panels)
VS1-12 Indoor Vacuum Circuit Breakers (withdrawable type)
RMU (Ring Main Units) for underground distribution (22 sets)
11/0.4kV Prefabricated Containerized Substations (8 units)
GCS/MNS Low Voltage Switchgear Panels (72 panels)
Reactive Power Compensation Panels (18 units)
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
66/11kV transformers feeding into traction substations
Dedicated 750V DC traction cabinets to power metro trains
Redundant feeder design to ensure no single-point failure
Medium Voltage Side
KYN28-12 switchgear with VS1 vacuum breakers for incomer, feeder, and bus coupler applications
RMUs deployed in underground tunnels for compact distribution
IEC 62271 compliant, with relay protection integrated into metro SCADA
Low Voltage Side
LV switchgear panels serving station lighting, escalators, HVAC, fire safety, ticketing, and depot facilities
Reactive compensation panels improved power factor and reduced energy costs
Prefabricated substations shortened civil construction time
Client Benefits:
High reliability: Redundant design ensures continuous traction power and passenger safety
Customized engineering: Compact RMUs solved underground space constraints
Efficient execution: Prefabricated substations reduced construction schedule by 4 months
