ABB RET615 Transformer Protection and Control Relay

Description

The RET615 is a high-performance relay designed for transformer protection and control in utility and industrial power distribution systems. It is part of ABB’s Relion® product family and the 615 series, offering a compact design and withdrawable-unit functionality. This device is optimized for two-winding transformers, unit transformers, step-up transformers, and generator-transformer blocks.

The RET615 is engineered to maximize the benefits of the IEC 61850 standard, ensuring interoperability between substation automation devices. Once the user applies the required application-specific settings, the relay is ready for immediate operation.

Key Features

1. Comprehensive Protection:
   • Transformer differential protection (87T) with harmonic restraint.
   • Restricted ground-fault protection for high-speed fault clearance.
   • Thermal overload, short circuit, and overcurrent protection.
   • Directional and non-directional ground fault and overvoltage protection.
   • Circuit breaker failure and arc flash detection (optional).
2. Advanced Monitoring:
   • Continuous measurement of high voltage (HV) and low voltage (LV) currents.
   • Symmetrical components, active/reactive power, and energy monitoring.
   • Supports up to eight RTD inputs for thermal management.
3. Disturbance Recorder:
   • Records up to 12 analog and 64 binary signals.
   • Stores data in non-volatile memory for post-event analysis.
4. Communication and Control:
   • Full IEC 61850 Edition 2 support, including GOOSE messaging and sampled values.
   • Additional protocols: Modbus® (RTU, ASCII, TCP) and DNP3 (serial/TCP).
   • Optional redundant Ethernet communication for enhanced reliability.

Technical Specifications

1. Physical Dimensions:
   • Width: Frame 177 mm, Case 164 mm.
   • Height: Frame 177 mm, Case 160 mm.
   • Depth: 201 mm.
   • Weight: Complete unit 4.1 kg, Plug-in unit only 2.1 kg.
2. Inputs and Outputs:
   • Six phase-current inputs, one neutral-current input.
   • Three phase-voltage inputs and one residual voltage input.
   • Optional RTD inputs for temperature and pressure measurements.
3. Power Supply:
   • Nominal auxiliary voltage: 24–250 V DC or 100–240 V AC.
   • Maximum interruption time: 50 ms without resetting.
4. Operating Conditions:
   • Operating temperature: -25°C to +55°C (short-term: -40°C to +85°C).
   • Humidity: <93% (non-condensing).
   • Altitude: Up to 2000 m.
5. Standards and Certifications:
   • EMC compliance: IEC 60255-26, EN 55011.
   • Environmental protection: IP54 front side, IP20 rear side.

Applications

• Protection of two-winding transformers in power distribution systems.
• Step-up transformers in generator-transformer blocks.
• Supervision and control of circuit breakers, disconnectors, and grounding switches.
• Monitoring of transformer thermal and operational conditions to ensure reliability.

For detailed information, please refer to the ABB RET615 User Manual