ABB RET670 1MRK002816-AB｜Control Relay｜

1. Product Identification
Item Description
Manufacturer ABB
Product Family Relion® 670 Series
Model RET670
Order Code 1MRK004816-AC
Device Type Transformer Protection and Control IED
Main Application Power transformer protection
Typical Installation Substations, generating stations, industrial power systems
Communication IEC 61850, IEC 60870-5-103, DNP3 (depending on configuration)

2. Main Protection Functions
Transformer Differential Protection (87T)

The core function of RET670 is high-performance transformer differential protection.

Features include:

Three-phase transformer differential protection
Two-winding and three-winding transformer applications
Restricted earth fault protection options
Harmonic restraint to prevent incorrect operation during transformer energization
High sensitivity for internal transformer faults

Typical protected equipment:

Power transformers
Generator step-up transformers
Autotransformers
Industrial transformers

3. Backup Protection Functions
Overcurrent Protection

Supported functions include:

Phase overcurrent protection
Earth-fault overcurrent protection
Instantaneous and time-delayed operation

ANSI functions:

ANSI Code Function
50 Instantaneous overcurrent
51 Time overcurrent
50N/51N Ground fault protection
Voltage Protection

Available voltage-based functions include:

Function Purpose
27 Undervoltage protection
59 Overvoltage protection
81 Frequency protection (depending on configuration)

These functions provide backup protection and system supervision.

4. Control and Monitoring Functions

RET670 integrates protection and control functions, reducing the need for separate control devices.

Typical functions:

Circuit breaker control
Disconnect switch control
Interlocking logic
Local/remote control selection
Transformer monitoring
Alarm handling
Event recording

The integrated logic can be customized using ABB engineering tools and Signal Matrix configuration.

5. Measurement Functions

The IED provides high-accuracy electrical measurements:

Current Measurements
Phase currents
Neutral current
Differential current
Sequence currents
Voltage Measurements
Phase voltages
Line voltages
Residual voltage
Power Measurements
Active power
Reactive power
Energy values
Power factor