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Phone：+86 15383419322Description
The Alstom P14NB11A2B0500A is a member of the MiCOM P14x series of numerical feeder protection relays, originally developed by Alstom Grid and now part of GE Vernova’s Grid Automation portfolio following GE’s acquisition of Alstom’s energy business. Designed for medium-voltage (MV) distribution networks up to 36 kV, this compact, cost-effective relay provides comprehensive protection, monitoring, and control for radial or ring-main feeders, transformers, motors, and capacitor banks.
The model code P14NB11A2B0500A decodes as follows:
- P14N: Base platform (MiCOM P14N)
- B: Standard overcurrent & earth fault protection
- 11: 2-phase current inputs (IA, IC), no neutral CT
- A2: Auxiliary voltage input (88–265 VAC/DC)
- B: Communication option – RS485 (Modbus RTU)
- 0500: IRIG-B time synchronization input
- A: Front-facing LCD with keypad
This configuration makes the Alstom P14NB11A2B0500A ideal for applications where space is limited (e.g., RMUs or switchgear panels) but precise, time-synchronized protection is required. It supports standard ANSI/IEEE protection functions including 50/51 (instantaneous/definite-time overcurrent), 50N/51N (ground fault), and thermal overload (49), all with programmable curves (IEC, IEEE, or user-defined).
With its embedded RS485 port and IRIG-B input, the Alstom P14NB11A2B0500A integrates seamlessly into modern SCADA and substation automation systems, enabling event logging with 1 ms timestamp accuracy—critical for fault analysis and grid resilience.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | Alstom P14NB11A2B0500A |
| Manufacturer | Alstom Grid → GE Vernova |
| Product Type | Numerical Feeder Protection Relay |
| Current Inputs | 2 phases (IA, IC), 1 A or 5 A selectable |
| Voltage Inputs | None (voltageless design) |
| Auxiliary Supply | 88–265 VAC/DC (universal) |
| Protection Functions | 50, 51, 50N, 51N, 49 (thermal), 79 (auto-reclose optional) |
| Communication | RS485 (Modbus RTU) |
| Time Sync Input | IRIG-B (amplitude modulated) |
| Display | Backlit LCD with 4-button keypad |
| Standards Compliance | IEC 60255, IEC 61000-4, IEEE C37.90, UL 508 |
| Operating Temperature | -25°C to +70°C |
| Mounting | Flush panel mount (92 x 92 mm cutout) |
| Certifications | CE, UL, CSA, KEMA |
Main Features and Advantages
Voltageless operation for cost efficiency: The Alstom P14NB11A2B0500A operates without voltage transformer inputs, reducing installation complexity and cost in simple radial feeders—common in industrial plants and secondary distribution networks.
High-accuracy ground fault detection: Using residual current derived from phase CTs (or an optional core-balance CT), it detects high-impedance earth faults down to 5% of rated current, enhancing personnel and equipment safety in ungrounded or high-resistance grounded systems.
IRIG-B time synchronization: With microsecond-level time alignment across the substation, the Alstom P14NB11A2B0500A enables precise sequence-of-events (SOE) reconstruction during cascading faults—essential for root-cause analysis and regulatory compliance.
Compact footprint, high functionality: Despite its small size (144 x 144 x 100 mm), it delivers full numerical protection capabilities rivaling larger relays, making it perfect for retrofitting legacy panels without costly redesigns.
Seamless migration path: Fully compatible with GE’s MiCOM S1 Studio software (successor to Alstom’s Easergy Studio), allowing engineers to configure, test, and archive settings using familiar tools—even in mixed-vendor environments.
Application Field
The Alstom P14NB11A2B0500A is widely deployed in utility distribution substations, commercial building switchgear, mining power centers, and renewable energy interconnection points. In wind and solar farms, it protects collector feeders from phase-to-phase and ground faults, often serving as the primary protection layer before upstream reclosers or breakers.
Industrial facilities use it on motor feeders (up to 5 MW) and transformer secondaries where thermal modeling and fast overcurrent response prevent winding damage. Its immunity to harmonics and DC offset ensures reliable operation near variable-frequency drives (VFDs) or rectifier loads.
In urban underground networks with ring-main units (RMUs), the Alstom P14NB11A2B0500A’s compact design and robust EMC performance make it a preferred choice for utilities upgrading from electromechanical relays to digital protection—enabling remote monitoring and faster restoration during outages.
Related Products
- Alstom P142: Enhanced version with voltage inputs and distance protection (for sub-transmission)
- GE P14N-B11A2B0500A: Same unit under GE branding post-acquisition
- Schneider Electric Easergy P3: Successor platform (MiCOM evolved under Schneider after GE sold Grid business in 2023)
- SEL-751: Competitor feeder relay from Schweitzer Engineering Laboratories
- Siemens 7SJ62: Alternative with similar functionality and IEC 61850 support
- MiCOM S1 Studio: Official configuration software for Alstom P14NB11A2B0500A
- Alstom P14N-XX: Family variants with Ethernet (e.g., P14NB11A2E0500A) or arc-flash detection
Installation and Maintenance
Pre-installation: Verify CT ratios and polarity match the relay settings. Ensure auxiliary supply matches nameplate (88–265 VAC/DC). Connect IRIG-B signal with proper shielding to avoid timing jitter. Use twisted-pair cable for RS485 (max 1200 m at 9600 bps).
Maintenance: No periodic calibration is required due to solid-state design. However, perform annual functional tests using secondary injection to validate trip curves and communication. Review event logs quarterly for abnormal current trends. Always back up settings before firmware updates (though this model rarely requires them).
Troubleshooting Tip: If the relay fails to communicate, check Modbus address and baud rate—default is often 9600, N, 8, 1. A blinking LED on the RS485 port indicates active traffic.
