Easun Reyrolle Rho-3 Motor Protection Relay

Easun Reyrolle Rho-3 Motor Protection Relay

Easun Reyrolle Rho-3 Numerical Motor Protection Relay: Advanced Protection and Control

The Easun Reyrolle Rho-3 is a state-of-the-art, microprocessor-based numerical relay designed to provide comprehensive protection, control, and monitoring for medium and low-voltage motors in demanding industrial and utility environments. Engineered for reliability and ease of use, the Rho-3 safeguards your critical assets against a wide range of electrical faults, minimizing downtime and maximizing operational efficiency.

Key Features & Technical Advantages

The Rho-3 Motor Protection Relay is packed with features that make it a superior choice for motor management:

• Comprehensive Motor Protection: Integrates a full suite of protection functions including Thermal Overload (TTF), Short Circuit, Stall Protection, Start Supervision, Unbalance / Negative Sequence, Earth Fault (both sensitive and instantaneous), Undercurrent, and Under/Over Voltage.

• Advanced Thermal Model: Accurately mimics the heating and cooling characteristics of your motor, accounting for I²t heating during starts and overloads, ensuring optimal protection without nuisance tripping.

• Integrated Control & PLC Logic: Features built-in programmable logic, allowing for custom control sequences like Auto-Reclose, interlocking, and control of circuit breakers, contactors, and auxiliary systems without external hardware.

• Robust Communication Capabilities: Equipped with a Modbus RTU communication protocol (RS485 interface) for seamless integration into SCADA, DCS, and plant-wide monitoring systems for real-time data acquisition and remote control.

• Large, Clear HMI: A backlit graphical LCD display provides intuitive access to real-time measurements, fault records, event logs, and relay settings. The user-friendly interface simplifies configuration and troubleshooting.

• Detailed Event Recorder: Captures and stores time-tagged fault data, event sequences, and trip records, providing invaluable information for post-fault analysis and root cause identification.

• CT & VT Inputs: Directly accepts inputs from Current Transformers (CTs) and Voltage Transformers (VTs) for accurate measurement and protection.

• Rugged Industrial Design: Built to withstand harsh electrical environments with high immunity to EMI/EMC disturbances, ensuring stable and reliable operation.

Core Protection Functions

The Rho-3 Relay is your motor’s first line of defense against damage from:

• Thermal Overload & Overcurrent

• Blocked Rotor / Prolonged Start (Stall)

• Phase Unbalance and Loss of Phase

• Earth Leakage & Earth Faults

• Short Circuit & Overcurrent

• Undercurrent (Jam Protection)

• Frequent Starts

• Under Voltage and Over Voltage

• Reverse Power (Optional)

Typical Applications

The versatility of the Easun Reyrolle Rho-3 makes it ideal for protecting motors in a wide array of sectors:

• Water & Wastewater Treatment Plants (Pump motors)

• Oil & Gas Industry (Compressors, pumps, fans)

• Mining & Mineral Processing

• Power Generation & Distribution

• Cement & Steel Manufacturing

• Chemical & Process Industries

• HVAC Systems and Large Fan Drives