Description
3. Key Technical Specifications
- Current Inputs: 1/5 A configurable (multiple CT channels)
- Voltage Inputs: Standard VT inputs for winding protection
- Auxiliary Power Supply: 48-250 V DC / 100-240 V AC
- Communication Protocols: IEC 61850, Modbus, DNP3, IEC 60870-5-103
- Protection Functions: Transformer differential, restricted earth fault, overcurrent, thermal overload, overexcitation
- Operating Temperature: -25°C to +55°C (standard)
- Dimensions (W x H x D): Approx. 246 x 160 x 201 mm (case)
- Weight: Approx. 2.8-3 kg complete
- Binary I/O: Configurable inputs and high-speed outputs
- Event Recording: Disturbance recorder and sequence of events
- Design: Withdrawable plug-in unit
- HMI: Large graphical display option
4. Product Introduction
The ABB RET620E-1G is a dedicated transformer protection and control IED from the Relion 620 series. It handles protection, control, measurement, and supervision for two-winding power transformers and generator-transformer blocks in utility and industrial systems.
It includes stabilized differential protection, overcurrent, voltage, and thermal functions tailored for transformers. The withdrawable design and IEC 61850 communication support easy installation and integration in modern substations.
- RET620E-1G
- RET620E-1G
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No power / no display | Auxiliary supply problem | Low | Measure voltage at power terminals | Verify supply matches 48-250 V DC range |
| Differential protection not balancing | CT polarity or ratio mismatch | High | View bias/restraint currents on HMI | Confirm vector group and ratio settings |
| No trip on overload | Thermal or overcurrent settings | Medium | Check measured currents and event log | Validate time constants and pickup values |
| Communication failure | Network or protocol config | Medium | Check Ethernet status and ping | Confirm IEC 61850 settings and GOOSE mapping |
| Self-supervision alarm | Internal or I/O fault | High | Note specific alarm on display | Cycle power and review diagnostics |
| Incorrect voltage readings | VT wiring or scaling | Low | Compare HMI values to field meters | Check VT ratios and connections |
Rule out external transformer or wiring issues first. Supply HMI screenshots, disturbance records, and logs for support.
6. Frequently Asked Questions (FAQ)
Is this a new original unit? Yes, New Original / New Surplus with traceability from OEM channels. Full QC testing completed prior to shipment.
Can I hot-swap the RET620 module? No. De-energize the transformer and associated circuits first. The withdrawable unit simplifies replacement once isolated.
Does it include transformer differential protection? Yes, stabilized differential protection suitable for two-winding transformers. Verify vector group and CT connections during commissioning.
What communication options are available? IEC 61850 with GOOSE is standard in many configurations, plus legacy protocols. Confirm your exact variant matches substation requirements.
Is this a direct replacement for older transformer relays? It serves as a modern replacement for legacy units. Match I/O count, firmware, and protection settings. Document old configuration before swap.
What warranty is provided? 1-year warranty on new surplus units. Covers functional performance under normal conditions. Project extensions available.
Why purchase surplus stock? Immediate availability avoids long factory lead times. Units undergo rigorous inspection, functional testing on compatible racks, and come with documentation. Test reports and supporting media available upon request. Keep critical spares to reduce transformer outage risks.
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