Product Description

Overview

The ABB RET670 (Part Number: 1MRK000008-MBr02) is a medium-sized Local Human-Machine Interface (LHMI) designed for the Relion® 670 series Intelligent Electronic Device (IED). It provides operators with a reliable interface to monitor, control, and protect power transformers, autotransformers, and shunt reactors. The MBr02 LHMI delivers a graphical representation of transformer bays, enabling real-time data visualization and operational control directly from the cubicle.

Applications

Ideal for transmission and sub-transmission substations, the RET670 LHMI supports:

• Two- and three-winding transformer protection

• On-load tap changer (OLTC) control

• Bay-level monitoring and fault analysis

• Integration into IEC 61850-compliant substations

Key Features

• Medium Graphical Display: Displays Single Line Diagrams (SLD) and live measurements.

• Programmable LEDs: 15 tri-color LEDs for alarms and trip status indications.

• Control Functions: Select-Before-Execute (SBE) buttons to prevent accidental operations.

• Comprehensive Protection: Supports differential, restricted earth fault (REF), inrush, and over-excitation restraint.

• Condition Monitoring: Monitors transformer health, thermal overloads, and through-fault accumulation.

• Disturbance Recording: Captures high-frequency data for detailed fault analysis.

• Communication Protocols: IEC 61850 (Edition 1 & 2), GOOSE messaging, Sampled Values, Modbus, DNP3.

• Redundancy Support: PRP and HSR via dual optical Ethernet ports.

• Industrial Durability: Front IP54 rating, suitable for demanding substation environments.

Technical Specifications

Peer Note: Medium (MBr02) vs. Large (NBr02) displays differ mainly in screen size. Medium is suitable for standard bays, while Large supports complex multi-breaker configurations. Check ribbon cable compatibility when replacing older units.

FAQ

Q: Can the MBr02 interface control multiple transformers simultaneously?
A: Yes, it supports automatic and manual voltage regulation for up to 8 transformers in parallel.

Q: What redundancy protocols are supported for critical networks?
A: Both PRP (Parallel Redundancy Protocol) and HSR (High-availability Seamless Redundancy) are supported via dual Ethernet ports.

Q: How does it differentiate between faults and inrush currents?
A: Advanced harmonic-based algorithms (2nd and 5th harmonic detection) distinguish actual faults from transformer energization or over-fluxing.