ABB RET670 1MRK004816-CC Relion 670 Transformer Protection Relay

The ABB RET670 1MRK004816-CC, also cataloged as the RET670 Transformer Protection Relay, operates as a dedicated hardware component for main protection, control, and supervision within two-winding and multi-winding power transformer networks.

Hardware Specifications

Backplane Bus Communication Velocity and Firmware Compatibility

• The unit processes multi-channel analog current and voltage samples via high-speed internal bus architecture to execute sub-cycle differential protection algorithms. Real-time GOOSE communications and sampled values route across deterministic Ethernet networks to eliminate fieldbus transmission latencies.
• Internal microcode firmware guarantees hardware-level flash compatibility across Relion 670 IED platforms. Expandable I/O processing boards dynamically sync with CPU firmware loops, maintaining fixed sampling intervals across variable system frequencies.

Frequently Asked Questions

Q: How is physical grounding established on the heavy-duty rack enclosure of this protection relay?

A: Grounding is established using a dedicated ground lug located on the rear chassis, which must connect directly to the main station earthing bus via heavy copper braiding.

Q: Can optional I/O channels or optical communication modules be added to the chassis in the field?

A: Hardware options must be inserted into pre-assigned backplane slots with main power de-energized, followed by firmware configuration updates through the protection system software suite.

Field Installation Guidelines

• Isolate all AC current transformer (CT) inputs using shorting terminal blocks and open all potential transformer (PT) supply fuses prior to performing maintenance or installation work.
• Mount the relay unit securely in a standard 19-inch panel rack or cutout using factory mounting brackets to preserve mechanical bonding and earth continuity.
• Route fiber-optic communication cables within protective conduit, observing minimum bend radius limits to prevent optical signal attenuation.
• Ensure all terminal block terminal screws are torque-tested to factory standards before reapplying auxiliary power to the unit.