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The ABB RET615 Transformer Protection and Control Relay is an advanced protection and control device engineered specifically for power transformer applications in utility substations and industrial power distribution systems. As part of the Relion® 615 protection relay family, the RET615 combines comprehensive protection logic, measurement capability, and integrated control in a compact, modular unit, ensuring robust asset protection and operational reliability.

Built for modern automated substations and industrial facilities, this relay supports international communication standards for seamless integration, high-speed protection, and efficient fault diagnostics. Its broad range of protection algorithms helps minimize downtime and safeguard critical transformer infrastructure.

Technical Specifications

Parameter	Specification
Product Name	ABB RET615
Module Type	Transformer Protection & Control Relay
Product Family	Relion® 615 Series
Core Function	Protection, control, measurement, and supervision of power transformers
Protection Functions	Differential (87T), overcurrent, earth-fault, thermal overload, V/Hz overexcitation, restricted earth-fault (REF), breaker failure protection (site dependent)
Communication Protocols	IEC 61850 (Edition 1 & 2), Modbus, DNP3, IEC 60870-5-103; optional Profibus DP-V1 via converter
Display	Large LCD graphical interface with single-line display editor and web-based HMI support
Mounting	Withdrawable plug-in frame for easy service and testing
Auxiliary Supply	24–250 V DC or 100–240 V AC (typical range)
Current Inputs	Multiple phase & neutral inputs (configurable)
Voltage Inputs	Phase & residual inputs supported (application dependent)
Dimensions (W × H × D)	~177 mm × 177 mm × 201 mm
Weight	~4 kg (complete unit)

Recommended Related Models

For a complete power protection and control solution, the RET615 is often paired with:

ABB REF615 — Feeder protection relay for outgoing circuits.
ABB REM615 — Motor protection and control relay.
ABB RET620 / RET630 — Other transformer protection variants within Relion®.
ABB PCM600 — Configuration and control software for ABB protection relays.

These combinations enhance plant protection against faults and optimize coordination between transformer, feeder, and motor protection layers.

Popular ABB Integration Platforms

The RET615 integrates seamlessly into:

Substation automation systems with IEC 61850 communications.
Industrial power distribution networks protecting step-up or step-down transformers.
Generator-transformer blocks in utility or renewable power plants.

This interoperability enables extensive data exchange and automated control within modern grid infrastructures.

Typical Applications

The ABB RET615 is ideal for:

Protection and supervision of two-winding power transformers.
Transformer protection in distribution substations.
Protection in generator–transformer blocks and industrial facilities.
High-availability systems requiring fast differential and fault trip logic.

It supports precise fault detection and rapid isolation to protect transformer assets and connected equipment.

Key Advantages

Comprehensive transformer protection: Includes differential protection with harmonic restraint and low-impedance restricted earth-fault protection.
Advanced communications: Supports modern protocols including IEC 61850 (Edition 2), Modbus, DNP3, and IEC 60870-5-103.
Flexible integration: Withdrawable design and protocol flexibility reduce installation and maintenance time.
High-speed fault response: REF and differential protection algorithms deliver rapid fault clearing.
User-friendly interface: Graphical LCD and web HMI simplify local and remote diagnostics.
Scalable configurations: Multiple standard configurations to match transformer vector groups and grounding methods.