ABB 1MRK000173-BE Relion 670 Transformer Input Module | 8I/12O TRM

Product Description

Overview

The ABB 1MRK000173-BE is a precision Transformer Input Module (TRM) designed for the Relion 670 series of Intelligent Electronic Devices (IEDs), including RET670, REL670, and REC670. This module provides 8 binary inputs and 10+2 output channels, enabling the monitoring of external switchgear signals and control of auxiliary devices.

Engineered for high-reliability substation environments, it safely interfaces with high-voltage primary circuits via galvanically isolated inputs, ensuring accurate signal scaling for the IED’s internal electronics.

Technical Description

The 1MRK000173-BE contains miniature transformers and isolation circuitry to convert high-level voltages and currents from instrument transformers (CTs and VTs) into signals compatible with IED processors. The "-BE" suffix identifies the input/output configuration, while "r00" represents the initial hardware revision.

This module is the first stage in signal conditioning within Relion 670 IEDs, maintaining both electrical isolation and linear signal integrity.

Performance Features

Input/Output Configuration

• Binary Inputs: 8 channels for conventional switch and pushbutton signals.

• Outputs: 10+2 relay channels for controlling other system devices.

Electrical Characteristics

• Nominal Input Voltage: 110–125 VDC

• Current Consumption: ~50 mA

• Galvanic Isolation: High dielectric strength ensures protection from surges and faults.

Accuracy and Signal Handling

• Optimized for 0.2 class measurement accuracy for both protection and metering applications.

• Supports high linearity even during fault conditions up to 40× rated current.

• Frequency range compatible with 50/60 Hz systems.

Hardware Robustness

• Low burden on external CTs and VTs prevents transformer saturation.

• Thermal design tolerates short-term overloads and continuous operation within rated limits.

• Compliance with IEC 60255-1 and IEC 61850 standards ensures substation-grade reliability.

Technical Specifications

Applications

• Interfaces with CTs and VTs for voltage and current scaling in substations.

• Monitors switchgear auxiliary contacts and control circuits.

• Suitable for protection, metering, and control within REL670, RET670, and REC670 IEDs.

Maintenance and Safety Note

Never remove the 1MRK000173-BE while the primary system is energized. Always short external CT circuits before service. Ensure the module’s rated current matches the PCM600 configuration to maintain protection accuracy.

FAQ

Q: What is the primary function of the 1MRK000173-BE module?
A: It scales high-voltage/current signals from CTs and VTs to levels suitable for the IED while providing electrical isolation.

Q: How many input/output channels does it have?
A: 8 binary inputs and 10+2 output channels.

Q: Is it compatible with all Relion 670 IEDs?
A: Yes, it supports RET670, REL670, and REC670 series.

Q: Can it operate safely under fault conditions?
A: Yes, the module maintains linearity up to 40× rated current and meets IEC standards for protection.