Schneider Electric Easergy MiCOM P543 Numerical Current Differential Protection Relay

Schneider Electric Easergy MiCOM P543 Numerical Current Differential Protection Relay is designed to provide fast and dependable protection for overhead transmission lines and underground cable systems. It combines high-speed current differential protection with integrated distance protection, giving utilities a complete line protection solution in a single relay.

The MiCOM P543 continuously compares the current measured at both ends of the protected line, allowing it to detect internal faults with excellent speed and accuracy while remaining stable during external faults. In addition to differential protection, the relay incorporates five-zone distance protection, overcurrent protection and auto-reclose functions, providing reliable backup protection whenever communication channels are unavailable.

Designed for single circuit breaker applications, the MiCOM P543 supports direct fibre optic and multiplexed communication channels for end-to-end line protection. It also integrates easily with digital substations through IEC 61850 communication and advanced automation features, making it suitable for both new installations and transmission system upgrades.

Specifications

• Manufacturer: Schneider Electric
• Product Family: Easergy MiCOM
• Model: MiCOM P543
• Relay Type: Numerical Current Differential Protection Relay
• Protection Application: Transmission line and underground cable protection
• Suitable For: HV, EHV and UHV transmission networks
• Main Protection: High-speed current differential protection
• Distance Protection: Integrated five-zone distance protection
• Overcurrent Protection: Supported
• Auto-Reclose: Supported
• Fault Locator: Integrated
• Differential Protection: Phase current differential
• Communication Channel: End-to-end longitudinal communication
• Communication Media: Direct fibre optic and multiplexed digital links
• Breaker Configuration: Single circuit breaker applications
• Event Recording: Supported
• Disturbance Recording: Supported
• Communication Interfaces: Serial and Ethernet
• Communication Protocols: IEC 61850, Modbus, DNP3 and IEC 60870-5-103
• Human Machine Interface: Multi-language HMI
• Integration: SCADA and substation automation compatible

Features

• Numerical relay combining current differential and distance protection.
• High-speed protection for overhead lines and underground cables.
• Integrated five-zone distance protection provides dependable backup.
• Fast and selective detection of internal transmission line faults.
• Stable operation during external and through faults.
• Built-in overcurrent protection and auto-reclose functions.
• Supports direct fibre optic and multiplexed communication channels.
• IEC 61850 communication for digital substation integration.
• Event and disturbance recording simplify fault analysis.
• Designed for single circuit breaker transmission line applications.

Applications

• Transmission line protection
• Overhead transmission lines
• Underground cable protection
• High-voltage substations
• Extra-high-voltage transmission systems
• Ultra-high-voltage transmission networks
• Utility power networks
• Digital substations
• Single circuit breaker feeder applications

Schneider Electric Easergy MiCOM P543 Numerical Current Differential Protection Relay combines high-speed differential protection with integrated distance protection, offering dependable performance for modern transmission networks that require fast fault clearance, reliable backup protection and flexible communication options.