The GE MiCOM Alstom P841 (P84193NC6M0760M) is a multifunctional Intelligent Electronic Device (IED) engineered for the control and backup protection of transmission and sub-transmission feeder bays. As a flagship component of the P40 Agile platform, it provides sophisticated, high-speed management of single or dual-circuit breaker autoreclose logic schemes, including synchrocheck functionality.

Designed for high-reliability environments, the P841 is widely used to monitor line terminal health, execute protection algorithms, and serve as a reliable gateway for substation automation.

 

Product Specifications & Data

Note: The following specifications represent standard characteristics for the P841 series. For exact configuration-specific data, please refer to the specific unit’s rating plate.

Feature	Specification
Product Model	P841 (Agile P40 Series)
Full Part Number	P84193NC6M0760M
Device Type	Line Terminal Management IED
Case Size	Available in 60TE (Model A) or 80TE (Model B)
Communication	IEC 61850, PRP, HSR, RSTP, Modbus, DNP3
Operating Temp	-25°C to +55°C
Weight	Approx. 3.5 kg – 5.0 kg (Model dependent)
Country of Origin	United Kingdom / Global

Key Application Areas

The P841 is designed for high-voltage transmission and distribution grids:

• Transmission/Sub-transmission Feeders: Essential for primary or backup protection.
• Dual Breaker Systems: Optimized for breaker-and-a-half, mesh, or ring-bus configurations.
• Smart Substations: Fully compatible with IEC 61850 digital substation architectures.
• Industrial Power Systems: Provides high-speed fault clearance and control logic for critical infrastructure.

 

Product Usage Instructions

1. Mounting: Designed for rack or panel mounting. Ensure the case is securely fastened to the panel and that the rear terminal blocks are accessible for wiring.
2. Configuration: Utilize the S1 Agile PC software for comprehensive settings configuration, including protection groups, logic gate programming, and communication protocols.
3. Operation: The front panel features 10 fully programmable function keys and tri-color LEDs for localized control, status indication, and alarm management.
4. Integration: Connect to the station bus using the rear Ethernet ports. Ensure the network switch supports the required protocols (e.g., PRP/HSR for zero-switchover redundancy).
5. Maintenance: Regularly check the unit’s diagnostic LEDs (RUN, STOP, FAIL) and monitor event logs via the Engineering Station to verify system health.

 

Q&A (Frequently Asked Questions)

Q: Is the P841 series still in production?

A: Manufacturing for the P841 has been officially discontinued. GE Vernova recommends the newer 5th Generation MiCOM P84 relay as a modern alternative.

Q: What is the benefit of the P841’s “Leader-Follower” logic?

A: In dual-breaker applications, the Leader-Follower scheme allows the relay to intelligently manage the reclosing sequence of two circuit breakers, ensuring synchronization and safety during power restoration.

Q: How do I handle redundant communication setup?

A: The P841 supports advanced redundancy protocols like Parallel Redundancy Protocol (PRP) and High-Availability Seamless Redundancy (HSR), which allow the device to maintain communication even if a network path fails.

 

Recommended Inventory Products

For your industrial spare parts repository, consider these complementary protection and control components:

1. P443 – MiCOM Distance Protection Relay
2. P143 – MiCOM Feeder Management Protection Relay
3. P127 – MiCOM Directional Overcurrent/Earth Fault Relay
4. 7SR18 – Siemens Reyrolle Solkor Differential Relay
5. 7SR45 – Self-Powered Overcurrent Protection Relay
6. CI854A – ABB Communication Interface Module
7. PM866K01 – ABB AC 800M Processor Unit
8. DO810 – Digital Output Module (for I/O expansion)
9. AI810 – Analog Input Module
10. SB821 – High-Speed Industrial Ethernet Switch