Technical Specifications Basic Identification Brand: Alstom / Areva T&D / GE Grid Solutions Full Model Code: P922S A00M111 Series: MiCOM P922 Compact Feeder Protection Range Product Type: Numerical Overcurrent & Earth Fault Protection IED Application: MV distribution feeder, distribution transformer, railway traction substation auxiliary bay protection Power Supply Parameters Rated Auxiliary Supply: DC 110V Operating Voltage Tolerance: 77 ~ 137.5 VDC Standby Power Consumption: ≤15W Surge Withstand Level: Class III overvoltage category, withstand 2kV surge pulse CT Input Electrical Ratings CT Secondary Rated Current: 5A (50Hz system) Phase Current Input Burden: <0.8VA per phase Residual Earth Fault CT Input: Separate dedicated residual current channel Core Protection Function Setting Ranges Phase Overcurrent (2-stage: IDMT long delay + Instantaneous) Pickup range: 0.1 ~ 30 × In Curve options: IEC standard inverse, very inverse, extremely inverse, definite time Instantaneous threshold: 2 ~ 40 × pickup value adjustable Residual Earth Fault (2-stage protection) Earth fault pickup: 0.05 ~ 10 × CT secondary rated current Independent long delay & instantaneous trip logic Supplementary Protection & Supervision Thermal overload protection for cable/transformer thermal monitoring Broken current transformer supervision alarm Trip circuit continuous supervision to detect broken trip wiring Undercurrent loss-of-load monitoring logic Digital Input & Relay Output Interface Binary Input (DI): 12 channels, DC110V signal level for breaker position, interlock, blocking signals Relay Output (DO): 8 forced-guided mechanical relay contacts AC-15 rating: 250VAC, 6A resistive/inductive load DC-13 rating: 110VDC, 3A inductive trip coil load Contact mechanical life: ≥10,000,000 cycles unloaded; electrical life ≥100,000 cycles full load Measurement & Fault Recording Measurement Accuracy: Class 0.5 for current sampling Fault Event Storage: 500 fault & alarm event logs with time stamp Disturbance Recorder: 40-cycle high-speed fault waveform capture for post-fault analysis Onboard memory stores setting parameters without external power supply Communication Interfaces Rear RS485 port: Modbus RTU standard protocol Front maintenance RS232 port for local parameter configuration Protocol support: Modbus, IEC 60870-5-103 substation bus protocol Mechanical & Installation Mounting: Standard flush panel mount, unified industry cutout size Front interface: Backlit LCD graphic display + membrane keypad + multi-color LED status indicators Terminal connection: Rear screw-clamp terminal blocks for CT, VT, auxiliary supply, DI/DO wiring Overall Dimensions: H 160 mm × W 144 mm × D 220 mm Net Weight: 1.28 kg Environmental & Compliance Standards Operating Ambient Temperature: -25 ℃ ~ +70 ℃ Storage & Transport Temperature: -40 ℃ ~ +85 ℃ Relative Humidity: 5% ~ 95% non-condensing Vibration & Shock: IEC 60255-21-1 substation equipment anti-vibration standard EMC Immunity: IEC 61000-6-2 industrial electromagnetic compatibility Compliance Standards: IEC 60255, IEC 60870-5, CE marked, RoHS & REACH compliant