Alstom MiCOM P643 Protection Relay

Alstom (GE Grid) MiCOM P643
Brand: Alstom (now part of GE Vernova Grid Solutions)
Model: MiCOM P643
Order Number: P643 (full variant: P643 926F6M0)
Product Name: Advanced Numerical Transformer Protection Relay / IED
Origin: France / India
HS Code: 85371090 (industrial control & protection relays)
Dimensions: 60 TE (108 mm) width, standard 19-inch rack mount
Weight: Approx. 1.8 kg
Operating Temperature: -10°C to +60°C
Storage Temperature: -40°C to +85°C

Auxiliary Supply Voltage: 110–250 V DC / 100–240 V AC
Power Consumption: Max. 15 W
CT Inputs: 12 × 3-phase CT inputs (3 bias sets, 1A/5A selectable)
VT Inputs: 4 × VT inputs (100/120 V AC)
Digital Inputs: 16 opto-isolated inputs
Relay Outputs: 20 changeover relays (4 high-break)
Communication: Dual Ethernet 100 Mbps (IEC 61850), RS485 (Modbus, Courier)
Display: Graphical LCD with tri-color LEDs & 10 function keys
Protection Functions:
– Biased differential protection (87T)
– Restricted earth fault (REF, 64)
– 3-stage thermal overload (49)
– Overfluxing (24), overcurrent, earth fault
– CT saturation & inrush restraint (2nd/5th harmonic)
Certifications: IEC 61508 SIL 2, CE, UL, cULus
Features:
– Advanced CT saturation immunity
– Transformer vector & ratio compensation
– Event recording (1024), disturbance recording
– Graphical programmable logic
– Self-diagnostics & asset monitoring
Applications:
– Protection for 3-winding transformers & auto-transformers
– Two-winding transformers with dual CTs
– Power generation substations & distribution grids
– Oil & gas, petrochemical, industrial power systems
– Renewable energy (wind/solar) step-up transformers
– Combined heat & power (CHP) plants