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The ALSTOM P40 AGILE MICOM P141 is a compact, multifunctional numerical protection relay designed for the protection, control, monitoring, and metering of medium-voltage feeders in utility distribution networks and industrial power systems. Originally developed under ALSTOM’s MICOM product line—now part of GE Grid Solutions following acquisition—the P141 belongs to the P40 Agile series, which emphasizes flexibility, interoperability, and cybersecurity for modern smart grids. This relay provides comprehensive overcurrent, earth fault, directional, and breaker failure protection, making it suitable for radial feeders, motor circuits, transformer incomers, and capacitor banks.
Built on a high-performance digital signal processor (DSP) platform, the ALSTOM P40 AGILE MICOM P141 executes protection algorithms with deterministic response times as low as 16 ms, ensuring rapid isolation of faults while maintaining system stability. It supports advanced communication protocols including IEC 61850 Edition 2 (with GOOSE and MMS), Modbus RTU/TCP, and DNP3, enabling seamless integration into substation automation systems (SAS). The P141 also features an intuitive front-panel LCD with navigation buttons, built-in oscillography (up to 64 disturbance records), and self-diagnostics—reducing commissioning time and operational risk. With its compact 4U (1/4 rack) form factor and wide operating temperature range, the P40 AGILE MICOM P141 delivers utility-grade performance in space-constrained switchgear panels.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | P40 AGILE MICOM P141 |
| Manufacturer | ALSTOM (now GE Grid Solutions) |
| Product Type | Multifunction Feeder Protection Relay |
| Protection Functions | 50/51, 50N/51N, 67, 50BF, 79 (auto-reclose), thermal overload, VT supervision |
| Current Input | 1 A or 5 A (selectable), 3-phase + neutral/earth |
| Voltage Input | 3-phase + residual (optional for directional functions) |
| Auxiliary Supply | 24–250 VDC or 100–240 VAC (universal) |
| Operating Temperature | -25°C to +70°C |
| Communication Interfaces | 2 × RS485 (Modbus/DNP3), 1 × Ethernet (IEC 61850, Modbus TCP), optional IRIG-B |
| Sampling Rate | 48 samples/cycle @ 50 Hz (960 Hz) |
| Trip Time Accuracy | ±1% or ±1 ms (whichever is greater) |
| Event & Disturbance Recording | 64 fault records, 1024 event log entries |
| Front Panel | Backlit LCD, 4 navigation keys, LED indicators (TRIP, ALARM, HEALTH) |
| Dimensions (H × W × D) | 177 mm × 105 mm × 190 mm (4U panel mount) |
| Standards Compliance | IEC 60255, IEC 61850 Ed. 2, IEEE C37.90, EN 50170 |
Main Features and Advantages
Comprehensive protection in a compact footprint: The ALSTOM P40 AGILE MICOM P141 integrates up to 20 protection functions—including sensitive earth fault (SEF), negative-sequence overcurrent, and programmable logic schemes—into a single 4U device. This eliminates the need for multiple discrete relays, reducing panel space, wiring complexity, and lifecycle costs. Its adaptive algorithms automatically adjust pickup and time settings based on load conditions, minimizing nuisance tripping during motor starts or transformer energization.
Native IEC 61850 for digital substations: Unlike legacy relays requiring protocol converters, the P40 AGILE MICOM P141 includes a fully compliant IEC 61850 stack with SCL file support, GOOSE messaging for inter-relay tripping, and MMS for SCADA data exchange. This future-proofs your substation for grid modernization initiatives and enables plug-and-play engineering using standard configuration tools like DIGSI or System Architect.
Advanced diagnostics and cyber resilience: The P141 features continuous self-monitoring of hardware health (RAM, flash, ADCs) and secure firmware updates via encrypted channels. Role-based access control (RBAC) and audit logs meet NERC CIP and IEC 62351 cybersecurity requirements. Built-in test modes allow verification of trip circuits without injecting primary current—enhancing safety during maintenance.
Integrated metering and asset visibility: Beyond protection, the ALSTOM P40 AGILE MICOM P141 provides real-time metering of voltage, current, power, energy, and power factor—with accuracy class 0.5S. Trend data and thermal models help predict cable or motor degradation, supporting predictive maintenance strategies. All data is timestamped with IRIG-B or SNTP for forensic analysis after grid disturbances.
Application Field
The ALSTOM P40 AGILE MICOM P141 is widely deployed in municipal and rural distribution networks, where it protects overhead and underground feeders against phase and ground faults. Its sensitive earth fault detection is particularly valuable in compensated (Petersen coil) or high-resistance grounded systems common in Europe and Asia. In industrial facilities—such as steel mills, data centers, and chemical plants—the P141 safeguards critical motor feeders, bus-tie breakers, and auxiliary transformers, often interfacing with PLC-based load-shedding schemes via hardwired contacts or GOOSE.
Renewable energy integration sites also rely on the P141 to manage bi-directional power flow from solar farms or wind turbines connected to the distribution grid. Its directional overcurrent function prevents backfeed faults from destabilizing upstream protection. Water and wastewater utilities use the relay on pump station feeders, where frequent starts demand robust thermal modeling. Across all these applications, the ALSTOM P40 AGILE MICOM P141 delivers a balance of protection intelligence, communication readiness, and operational simplicity—making it a cornerstone of resilient, modern power systems.
Related Products
MICOM P142: Enhanced version with additional voltage inputs and synchrocheck functionality for bus-tie applications.
MICOM P143: Includes distance protection (21) for longer radial or weak-grid feeders.
P40 Agile P127: Motor protection variant with stall, start-time, and unbalance detection.
GE UR Series (e.g., F60): Successor platform under GE Grid Solutions—offers higher scalability but larger footprint.
DIGSI 5: Official engineering software for configuring and testing P40 AGILE MICOM P141 relays.
Micom S1 Studio: Legacy configuration tool for older MICOM devices—still compatible with P141.
ALSTOM P341: Generator protection relay from the same P40 Agile family—shares communication architecture with P141.
Installation and Maintenance
Pre-installation preparation: Before installing the ALSTOM P40 AGILE MICOM P141, verify that CT ratios, VT availability, and auxiliary supply match the project settings. Ensure the panel cutout conforms to IEC 61850 dimensions (177 × 105 mm). Ground the relay chassis to the switchgear earth bar using a short, low-impedance conductor. Connect CT secondary leads with polarity observed—reverse connections will impair directional functions. Load the latest SCL or CID file if integrating into an IEC 61850 network.
Maintenance recommendations: The P40 AGILE MICOM P141 requires no periodic calibration due to its solid-state design, but annual functional tests using secondary injection are recommended per IEEE C37.90. Review event logs and disturbance records after any system fault to validate relay behavior. Keep firmware updated to address cybersecurity advisories—updates can be applied via USB or Ethernet with digital signature verification. Store spare P40 AGILE MICOM P141 units in ESD-safe packaging at room temperature, away from magnetic fields.
