ABB RET670 | Transformer Protection Relay | Replacement Guide & PCM600 Configuration

Description

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3. Key Technical Specifications

4. Product Introduction

The ABB RET670 (Ordering Code: 1MRK002816-AB) is a dedicated transformer protection and control IED from ABB’s Relion® 670 series, specifically designed for the protection, control, measurement, and monitoring of power transformers in transmission and distribution networks.The Relion 670 series represents ABB’s advanced protection platform that brings substation-grade protection technology with enhanced communication capabilities to high-voltage applications. The RET670 variant is optimized for transformer-specific protection requirements with comprehensive differential protection capabilities, making it ideal for critical transformer applications where maximum protection sensitivity and reliability are required.Key Features:

• Transformer Differential Protection (87T): Provides high-sensitivity protection against internal transformer faults by comparing current at all transformer windings. Essential for large power transformers where standard overcurrent protection may not provide adequate sensitivity.
• Restricted Earth Fault Protection (64R): Sensitive earth fault protection for transformer windings, providing fast detection of ground faults within the protected zone.
• Comprehensive Transformer Protection: Includes overcurrent protection, earth fault protection, overexcitation protection, thermal overload protection, and voltage/frequency protection for complete transformer coverage.
• IEC 61850 Native: Built from the ground up to support IEC 61850 Edition 2, enabling seamless integration into modern digital substations and smart grid networks. Supports GOOSE messaging for high-speed interlocking and control schemes.
• Redundant Communication: Supports PRP (Parallel Redundancy Protocol) or HSR (High-availability Seamless Redundancy) for zero-delay redundant Ethernet communication, ensuring maximum availability for critical transformer protection applications.
• Multi-winding Support: Supports differential protection for transformers with 2-5 windings, including auto-transformers and three-winding transformers.
• CT Saturation Detection: Built-in stability enhancement through CT saturation detection and harmonic restraint, preventing false trips during external faults or transformer energization (inrush current).
• Advanced Diagnostics: Features extensive self-monitoring, condition monitoring, and disturbance recording capabilities to aid in predictive maintenance and root cause analysis.
• Cybersecurity: Designed with “security by design” principles, complying with IEC 62351 standards to protect against cyber threats.

Typical Applications:

• Power transformers in transmission substations (110kV – 500kV)
• Distribution transformers in utility networks
• Auto-transformers for voltage regulation
• Reactor protection applications
• Industrial power transformers in large facilities

The RET670 is configured entirely via the PCM600 software suite, offering intuitive graphical configuration, setting management, and real-time monitoring. We supply genuine new surplus units with full factory documentation and configuration files.

5. Troubleshooting Quick Reference

Closing Suggestion: For complex issues involving differential protection or communication protocols:

1. Export the Disturbance Record and Event Log via PCM600.
2. Capture the Configuration File (.IED) from PCM600.
3. For differential issues, verify CT polarity and ratios at all transformer windings.
4. Provide these files to technical support for detailed analysis.

Our engineers can typically diagnose communication or logic issues within 2 hours using these data points.

6. Frequently Asked Questions (FAQ)

Q1: What is the difference between RET670, REC670, and REL670?A: All are part of the Relion 670 series but optimized for different applications:表格

Choose RET670 for transformer protection, REC670 for breaker control and bay control, and REL670 for transmission line protection.Q2: What does the ordering code “1MRK002816-AB” specifically indicate?A: ABB ordering codes define specific hardware and software configurations:

• 1MRK: Indicates the product family (Protection/Control – Relion 670 series)
• 002816: The base model identifier for this specific RET670 configuration
• -AB: The revision or suffix indicating specific options, such as:
  • Auxiliary voltage range (e.g., 110V DC vs 220V DC)
  • Communication interface configuration (IEC 61850 ports, serial ports)
  • Hardware revision level
  • Regional customization (e.g., specific language or standard compliance)

Recommendation: When replacing, try to match the full ordering code exactly. If substituting with a different suffix (e.g., -AC), verify the auxiliary voltage, communication interfaces, and firmware compatibility first.Q3: Does the RET670 support IEC 61850 communication?A: Yes. The RET670 natively supports IEC 61850 Edition 2, including:

• MMS (Manufacturing Message Specification): For client-server communication with SCADA/DCS.
• GOOSE (Generic Object Oriented Substation Event): For high-speed peer-to-peer communication (trip signals, interlocking).
• SCL (Substation Configuration Language): For system configuration and integration.

This enables seamless integration into modern digital substations without requiring external communication gateways.Q4: What software is used to configure the RET670?A: The ABB PCM600 (Protection and Control Manager 600) software is the standard engineering tool. It provides:

• Intuitive graphical configuration of protection functions.
• IEC 61850 system configuration (SCL file handling).
• Real-time monitoring and testing.
• Disturbance record analysis.
• Firmware management.
• Setting comparison and documentation.
• RIO600 remote I/O configuration.

PCM600 is compatible with Windows 10/11 and supports all Relion 615/620/670 series devices.Q5: How does the transformer differential protection work in RET670?A: The RET670 transformer differential protection works by:

1. Current Comparison: Compares current entering and leaving the transformer (using CTs at all windings).
2. Differential Current Calculation: Calculates the difference between the current measurements at all windings.
3. Restraint Characteristic: Uses a percentage differential characteristic with through-current restraint to ensure stability during external faults and transformer energization.
4. Harmonic Restraint: Uses 2nd harmonic (for inrush) and 5th harmonic (for overexcitation) restraint to prevent false trips.
5. CT Match Compensation: Compensates for different CT ratios and transformer vector groups.
6. Trip Decision: If the differential current exceeds the configured threshold (considering restraint), a trip signal is issued.

Key Settings:

• Differential Pickup: Minimum differential current to initiate protection.
• Slope: Percentage slope of the differential characteristic.
• Harmonic Restraint: 2nd and 5th harmonic blocking thresholds.
• CT Match: Compensates for different CT ratios and transformer vector groups.

Q6: Can the RET670 work with remote I/O devices?A: Yes. The RET670 is compatible with ABB RIO600 remote I/O devices, which allows:

• Scalable I/O: Add additional digital and analog I/O points as needed.
• Distributed Architecture: Place I/O closer to field devices, reducing wiring costs.
• Flexible Installation: Remote I/O can be installed in separate cabinets or locations.
• Seamless Integration: Configured through the same PCM600 software as the main RET670 unit.

This is particularly useful for large transformer installations where I/O points are spread across different locations.Q7: What is the warranty and support status for RET670?A: As a current-generation product, the RET670 is fully supported by ABB with long-term availability guarantees.

• Warranty: We provide a 12-month warranty on our New Surplus units (covering hardware defects).
• Support: Full access to ABB technical documentation, firmware updates, and software tools.
• Lifecycle: Expected service life exceeds 15-20 years with ongoing support.
• Spare Parts: Individual modules and components available for repair.

Q8: What transformer types can the RET670 protect?A: The RET670 supports various transformer configurations:

• Two-winding Transformers: Standard power transformers
• Three-winding Transformers: Transformers with three voltage levels
• Auto-transformers: With common and series windings
• Reactors: Shunt and series reactors
• Multi-winding Transformers: Up to 5 windings supported

The relay can be configured for various vector groups (Yy, Yd, Dy, Dd, etc.) with appropriate phase shift compensation.Q9: How do I backup settings for a RET670?A: Settings backup is straightforward via PCM600:

1. Connect: Establish communication with the relay (Ethernet or Serial).
2. Read: Use “Read from IED” function in PCM600.
3. Save: Export the configuration as an .IED file.
4. Document: Generate setting reports in PDF/Excel format.

For emergency backup, you can also:

• Export individual setting groups.
• Print settings from the local HMI.
• Save disturbance records and event logs separately.

Recommendation: Maintain regular backups after any setting changes and store copies off-site.Q10: Do you provide technical assistance for setting calculations?A: Yes. Our team includes engineers experienced with ABB Relion series relays. We can assist with:

• Transformer Data Entry: Verifying nameplate data, CT/VT ratios, and vector groups.
• Differential Protection Settings: Calculating differential pickup, slope, and restraint settings.
• Harmonic Restraint: Setting appropriate 2nd/5th harmonic blocking thresholds.
• REF Protection: Calculating restricted earth fault settings.
• Protection Coordination: Ensuring proper coordination with upstream/downstream devices.
• IEC 61850 Configuration: GOOSE mapping and SCL file integration.
• RIO600 Integration: Configuring remote I/O devices.

Please provide your transformer nameplate data, single-line diagram, CT/VT ratios, and protection requirements for specific advice.

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