ABB RET620E-1G

2. Function Features

Protection Functions
- It has ratio – restraint and differential – current quick – break transformer differential protection. This offers rapid protection for inter – phase, turn – to – turn winding, and bushing faults. Besides secondary – harmonic suppression, an advanced waveform – based blocking algorithm ensures stability during transformer excitation, and the fifth – harmonic suppression function guarantees reliable operation during transformer over – excitation.
- Sensitive restricted – earth – fault protection provides comprehensive differential protection. It can detect single – phase earth faults in transformer neutral – grounded systems. Both conventional high – resistance or low – resistance restricted – earth protection can be used for transformer winding protection. When using sensitive restricted – earth – fault protection, no stabilizing resistor or rheostat is required. Also, the neutral – point current transformer ratio can be different from the phase – current transformer ratio. Due to its unit – protection characteristics and absolute selectivity, this protection can quickly clear faults without coordinating with other protection delays.
- The device has a thermal over – load protection function to monitor the thermal stress of the transformer winding, preventing premature aging of the winding insulation. Multiple setting segments for quick – break, over – current, negative – phase – sequence, and backup earth protection can be used for both high – and low – voltage windings respectively. It also provides earth – fault protection based on measured or calculated zero – sequence voltage. Additionally, three – phase over – voltage, three – phase under – voltage, and zero – sequence over – voltage protection are available. Moreover, circuit – breaker failure protection can be provided.
Default Configuration
The 620 series protection and control devices have a default configuration. While it is not intended for direct use by end – users, it can serve as an example for 620 series projects with different function modules. End – users need to use configuration tools to create their own application configurations, but they can start from this default configuration and modify it according to their needs.

3. Technical Specifications

Power Supply: Information not directly provided in the search results. However, for similar ABB products, it may have a power supply range such as 24 – 265 V AC/DC.
Communication: Similar ABB protection devices support communication protocols like Modbus, IEC 60870 – 5 – 103, and may support IEC 61850 as the 620 series is based on this standard. These protocols enable data exchange and remote monitoring.
Size and Installation: Specific size details are not given. But as part of the 620 series, it may have a compact design for easy installation and integration in substations and industrial distribution systems.

4. Application Scenarios

Power System: RET620E – 1G is widely used in power systems, especially in substations and industrial distribution systems. It plays a crucial role in protecting power and step – up transformers, ensuring the safe and reliable operation of the power grid.
Industrial Automation: In industrial automation scenarios, it provides reliable protection and control for transformers in industrial plants, safeguarding the stable operation of industrial production equipment that depends on the power supply from these transformers.

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