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The ABBRET670 is a high-performance, multifunctional transformer protection relay designed for comprehensive protection of power transformers and shunt reactors in transmission and distribution networks. As a flagship member of ABB's Relion® 670 series, the RET670 provides advanced differential protection, backup protection, control, and monitoring capabilities for critical power system assets .

The ABB RET670 is optimized for transmission applications, offering extremely fast differential protection with automatic CT ratio matching and vector group compensation. The RET670 can be configured to protect two-winding transformers, three-winding transformers, autotransformers, and generator-transformer units in both single and multi-breaker arrangements .

Model Variants RET670 A10, A25, A30, B30, A40, B40 (pre-configured); Custom configurations available

Rated Voltage Up to 245 kV (via external VTs)

Rated Current Up to 5A (nominal), supports 1A/5A CT inputs

Frequency Range 45-65 Hz (operates correctly over wide frequency variations)

Analog Inputs Up to 24 AI (12 current + 12 voltage) via Transformer Input Module (TIM)

Binary Inputs 32 configurable inputs

Binary Outputs 32 configurable outputs (trip relays and signal contacts)

Communication Protocols IEC 61850-8-1 (Edition 1 & 2), Modbus TCP/RTU, DNP3.0, IEC 60870-5-103, PROFIBUS

Ethernet Ports Dual redundant Ethernet for IEC 61850 and station bus

Operating Temperature -40°C to +70°C (ambient)

Enclosure 19-inch rack mount, 4U height

Display Large graphical LCD with single-line diagram capability

Compliance IEC 61850, IEEE C37.118 (synchrophasor), CE, UL

The RET670 offers comprehensive protection capabilities specifically designed for transformer applications:

Transformer Differential Protection (87T): Two-winding (T2WPDIF) and three-winding (T3WPDIF) differential protection with 2nd and 5th harmonic restraint for magnetizing inrush detection, overexcitation restraint, and external/internal fault discriminator

Restricted Earth-Fault Protection (87N): Both high-impedance (HZPDIF) and low-impedance (REFPDIF) implementations for sensitive internal earth-fault detection

Overcurrent Protection: Four-step phase overcurrent (OC4PTOC - 51/67) and four-step residual overcurrent (EF4PTOC - 51N/67N) with directional capability

Thermal Overload Protection (49): Dual time-constant thermal model for transformers (T2PTTR) with exponential cooldown curves and hot-spot temperature calculation

Distance Protection (21): Backup protection for phase-to-phase and phase-to-earth faults with quadrilateral and mho characteristics (DSTPDIS, ZMQPDIS)

Voltage Protection: Two-step undervoltage (UV2PTUV - 27), two-step overvoltage (OV2PTOV - 59), and residual overvoltage (ROV2PTOV - 59N)

Frequency Protection: Underfrequency (SAPTUF - 81U), overfrequency (SAPTOF - 81O), and rate-of-change frequency (SAPFRC - 81R) protection

Breaker Failure Protection (50BF): Current and contact-based breaker failure protection (CCBRBRF) with three-pole and single-pole operation

Tap-Changer Control: Automatic voltage regulation with parallel transformer control 

Configuration Steps

Software Setup: Install ABB PCM600 (Protection and Control IED Manager) with RET670 connectivity package. Use the graphical configuration tool to customize protection logic

IEC 61850 Configuration: Configure SCL (Substation Configuration Language) files for station communication. The RET670 supports both Edition 1 and Edition 2 of IEC 61850 with flexible product naming for vendor-independent data models

Transformer Parameters: Input transformer nameplate data including rated power, voltage ratios, vector group, and CT/VT ratios. The RET670 automatically calculates vector group compensation and ratio matching

Protection Settings: Configure differential protection pickup (IdMin), harmonic restraint levels (2nd harmonic typically 15-20%, 5th harmonic 30-35%), and operating characteristics using the graphical logic tool

Communication Setup: Establish redundant Ethernet connections for station bus and process bus (if using IEC 61850-9-2LE sampled values)

Daily Operation

Monitor the large graphical LCD displaying real-time single-line diagrams, measured values, and protection status

Use the RET670 local HMI to view event logs, disturbance records, and circuit breaker condition monitoring data

Access remote monitoring via web interface or SCADA integration using IEC 61850 reporting and GOOSE messaging 

Pre-Installation Requirements

Mount the ABB RET670 in a clean, dry substation control room or switchgear compartment with ambient temperature between -40°C and +70°C

Ensure minimum clearances for ventilation and maintenance access

Verify that CT and VT ratios match the RET670 configuration (1A or 5A CT secondaries, 100V or 110V VT secondaries)

Hardware Installation

Chassis Mounting: Install the RET670 in a standard 19-inch rack using provided mounting brackets. The unit occupies 4U vertical space

TIM Module Installation: Install Transformer Input Modules (TIM) for analog current and voltage inputs. Support for up to 12 current and 12 voltage inputs per IED

Binary I/O Connection: Connect binary inputs (32) for status monitoring and binary outputs (32) for tripping and signaling. I/O modules configured with PCM600 (BIM, BOM, or IOM) are automatically supervised

Communication Wiring:

Connect dual Ethernet cables for redundant station bus communication

Configure optical fiber connections for IEC 61850-9-2LE sampled values if applicable

Set up RS-485 or fiber optic connections for Modbus, DNP3, or IEC 60870-5-103

Power Supply Connection: Connect auxiliary power supply (24-60V DC or 100-240V AC/DC with ±20% tolerance)

Pre-Energization Checks

Verify all terminal connections for tightness and proper polarity

Check CT circuit integrity using the RET670 built-in CT supervision function

Validate insulation resistance >100 MΩ at 500V DC

Confirm firmware version compatibility with PCM600 software

Hardware Verification: Confirm RET670 model number and configuration match application requirements (A10 for backup protection, A30/B30 for two-winding, A40/B40 for three-winding transformers)

Parameter Configuration: Load transformer data and protection settings using PCM600. Upload configuration to the RET670 via front Ethernet port or USB

Communication Testing:

Verify IEC 61850 GOOSE messaging with adjacent IEDs

Test Modbus TCP or DNP3 communication with SCADA master

Validate IEEE C37.118 synchrophasor streaming if equipped with PMU functionality

Protection Testing:

Perform secondary injection testing for all protection functions

Verify differential protection stability through load current measurement

Test harmonic restraint blocking during transformer energization simulation

Functional Testing: Test trip and close operations, verify breaker failure protection timing, and validate auto-reclosing sequences if applicable

RET670 A10 Transformer backup protection with voltage control

RET670 A30 Two-winding transformer protection for single breaker arrangements

RET670 B30 Two-winding transformer protection for multi-breaker arrangements

RET670 A40 Three-winding transformer protection for single breaker arrangements

RET670 B40 Three-winding transformer protection for multi-breaker arrangements

REG670 Generator protection relay with similar hardware platform

REL670 Line distance protection relay for transmission line applications

REB670 Busbar protection relay for substation bus protection

REC670 Bay control relay for switchgear control and interlocking

REM615 Motor protection relay for transformer cooling pump motors

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We have a vast inventory of thousands of new, refurbished, and outdated automation components, including products from well-known manufacturers such as ABB and Schneider. If you cannot find the required parts, please do not worry. We work closely with a global network of professional suppliers to provide you with tailored quotes even if the part is not listed on our website.

Who can I contact if I encounter any problems?

Our experienced customer service team will handle any issues after you place your order.