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

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).
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.
Disturbance Recorder:
- Records up to 12 analog and 64 binary signals.
- Stores data in non-volatile memory for post-event analysis.
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

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.
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.
Power Supply:
- Nominal auxiliary voltage: 24–250 V DC or 100–240 V AC.
- Maximum interruption time: 50 ms without resetting.
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.
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

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