Description
3. Key Technical Specifications
- Current Inputs: Up to multiple 1/5 A CT sets for windings and neutral
- Voltage Inputs: Multiple VT channels for voltage and regulation functions
- Auxiliary Power Supply: Wide range 48-250 V DC / 100-240 V AC
- Communication Protocols: IEC 61850, DNP3, Modbus, IEC 60870-5-103
- Protection Functions: Transformer differential (with harmonic restraint), restricted earth fault, backup overcurrent, thermal overload, overexcitation, impedance
- I/O Capacity: Highly expandable (up to dozens of binary inputs/outputs)
- Operating Temperature: -40°C to +70°C (typical for 670 series)
- HMI: Large graphical display with Single Line Diagram
- Recording: Advanced disturbance and event recording
- Design: Modular 670 series hardware with full application flexibility
4. Product Introduction
The ABB RET670 is an advanced transformer protection IED in the Relion 670 series. It delivers fast, selective protection, control, monitoring, and supervision for two- and three-winding transformers, autotransformers, generator-transformer units, and shunt reactors.
It features high-performance differential protection with automatic CT ratio matching and vector group compensation. The modular design and extensive function library make it suitable for demanding transmission and subtransmission applications.
- RET670
- RET670
- RET670
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No display/power | Auxiliary voltage missing | Low | Measure at power module terminals | Verify supply range and connections |
| Differential not stable | CT ratio/polarity or saturation | High | Monitor restraint and operate currents | Confirm settings and check for CT issues during energization |
| No backup trip | Function blocked or settings | Medium | Review active functions and logs | Validate coordination with downstream devices |
| Communication errors | Protocol mismatch | Medium | Check port status in PCM600 | Verify network parameters and redundancy |
| IRF alarm | Module or configuration fault | High | Read detailed self-supervision info | Isolate faulty module using diagnostics |
| Tap changer issues | Control logic or feedback | Low | Monitor OLTC position and voltage | Check BCD inputs and AVR settings |
Field wiring and CT/VT problems account for the majority of issues. Always export disturbance records for analysis.
6. Frequently Asked Questions (FAQ)
Is this a new original unit? Yes, supplied as New Original / New Surplus with traceability. Units are tested prior to dispatch.
Can one RET670 protect a three-winding transformer? Yes. It supports complex configurations including multiple differential zones when properly equipped.
Is hot-swapping supported? No. Follow proper isolation procedures for the transformer before servicing any IED hardware.
What makes the 670 series different from 650/620? The 670 series offers higher performance, greater I/O density, and more advanced customization for critical high-voltage applications.
How is configuration performed? Use PCM600 for application configuration, parameter setting, and commissioning. Pre-configured templates are available as starting points.
What warranty is included? Standard 1-year warranty on new surplus. Extended coverage and support packages available for strategic spares.
Why keep RET670 spares in inventory? This IED protects critical high-value assets. Surplus provides immediate replacement capability. All units receive comprehensive QC, functional verification, and documentation. Test data available on request to support confident deployment.
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