ALSTOM P40 AGILE MICOM P141 Motor protection relay

ALSTOM P40 Agile MICOM P141 Technical Overview

1. General Description

The MICOM P141 under the P40 Agile series is a multi-function motor protection relay designed to safeguard three-phase induction motors and feeders. It provides comprehensive protection against electrical faults, thermal stress, and operational anomalies while enabling seamless integration with modern automation systems.

2. Key Technical Specifications

• Electrical Ratings
  • Rated System Voltage: 110–690V AC (phase-to-phase) or via voltage transformers (VT).
  • Current Inputs: 1A or 5A secondary CTs (configurable).
  • Frequency Range: 16–60 Hz (±0.1% accuracy).
  • Auxiliary Supply: 24–250V DC/AC (±20%).
• Protection Functions
  • Motor-Specific Protections: 
    • Thermal Overload (49): Mimics motor thermal capacity using adjustable thermal curves.
    • Stalling (14/51): Locked rotor and start/restart supervision.
    • Phase Unbalance (46): Detects asymmetry due to phase loss or supply issues.
    • Earth Fault (50G/51G): Directional/non-directional ground fault protection.
  • General Protections: 
    • Overcurrent (50/51), Short Circuit (50), Undercurrent (37).
    • Voltage Protection (27/47/59): Undervoltage, phase reversal, overvoltage.
  • Advanced Features: 
    • Start Inhibit: Prevents frequent motor restarts.
    • Load Jam Protection (48): Detects mechanical blockages.
• Communication & Integration
  • Protocols: Modbus RTU/TCP, IEC 60870-5-103/104, IEC 61850 (GOOSE, MMS).
  • Digital I/O: 8+ programmable contacts for tripping, alarms, and control logic.
  • Human-Machine Interface (HMI): Large LCD with intuitive menu navigation.
• Environmental & Mechanical
  • Operating Temperature: -25°C to +70°C (-13°F to +158°F).
  • Enclosure Rating: IP52 (dust/water-resistant front panel).
  • Mounting: DIN rail or panel-mounted (standard 96x96mm cutout).
• Certifications
  • IEC 60255, ANSI C37.90, CE Mark, UL 508.

3. Functional Capabilities

1. Thermal Model Protection
   • Dynamic calculation of motor heating using embedded thermal models (I²t curves).
   • Adjustable thermal time constants for various motor types (e.g., NEMA, IEC).
2. Diagnostics & Data Logging
   • Event Recorder: Stores 1,000+ timestamps with fault magnitude and duration.
   • Trending: Captures motor current, voltage, and temperature trends for predictive maintenance.
3. Grid & Automation Integration
   • Supports Crowbar Protection for fast fault isolation.
   • Integration with PLCs, SCADA, or DCS via IEC 61850 for Industry 4.0 compliance.
4. Self-Diagnostics & Health Monitoring
   • Continuous monitoring of CT/VT health, relay firmware, and communication links.
5. User Flexibility
   • Customizable protection logic using FlexLogic™ equations.
   • Language support (English, French, Spanish) for global deployment.

4. Applications

• Industrial Motors: Pumps, fans, compressors, crushers.
• HVAC Systems: Chillers, air handlers, cooling towers.
• Mining & Cement Plants: Conveyors, ball mills, rotary kilns.
• Water/Wastewater Treatment: Centrifugal pumps, mixers.

5. Ordering Information

• Model: MICOM P141 (confirm suffix for voltage/communication options, e.g., P141VG).
• Accessories: 
  • CT/VT kits (e.g., 1A or 5A).
  • Communication gateways (e.g., IEC 61850 converters).
  • Mounting brackets and USB configuration cables.

Key Advantages

• High Speed: <20ms tripping time for critical faults.
• Interoperability: Compatible with Hitachi Energy’s Relion® and third-party systems.
• Cybersecurity: Supports role-based access and secure communication (IEC 62351).