ABB 500TRM02 1MRB150011R0001 Terminal/Input-Output Board
The ABB 500TRM02 (Part Number: 1MRB150011R0001) is a high-performance Transformer Module (or Terminal/Input-Output Board) belonging to the ABB REB500 busbar protection family.
It acts as the physical interface for analog signals, specifically designed to convert and isolate high-level current and voltage signals from primary equipment into low-level signals for digital processing.
Technical Parameter Table
| Parameter | Specification |
| Model Number | 500TRM02 |
| Order Code | 1MRB150011R0001 |
| Function | Analog Input Transformer / Signal Conditioning |
| Number of Channels | Typically 10 to 12 Analog Inputs (CT/VT) |
| Rated Input Current | 1A or 5A (Software/Hardware selectable) |
| Rated Input Voltage | 100V – 120V AC (Nominal) |
| Isolation Voltage | 2.5 kV AC (between primary and secondary) |
| Burden | < 0.1 VA per channel (Current); < 0.25 VA (Voltage) |
| Operating Temperature | -25°C to +60°C |
| Weight | ~0.50 kg |
Product Advantages and Features
High-Accuracy Isolation: Uses high-grade magnetic transformers to ensure a clean, isolated signal, protecting sensitive CPU boards from high-voltage transients.
Mill-Duty Robustness: Designed with a ruggedized housing to withstand the vibration, dust, and temperature extremes of power plants and petrochemical facilities.
Fast Sampling Integration: Optimized to support the REB500’s sub-cycle tripping speed requirements by providing zero-phase-shift signal conversion.
Versatile Signal Handling: Can be configured to handle both Current Transformer (CT) and Voltage Transformer (VT) inputs in a single module.
Modular Design: Facilitates easy hot-swapping or system expansion in 19-inch rack-mounted protection schemes.
Application Cases
Substation Automation: Acts as the primary analog interface for REB500 bay units, measuring feeder currents for differential protection.
Transformer Protection: Monitoring currents at the primary and secondary ends of power transformers to detect internal faults.
Load Management: Provides real-time analog data to SCADA systems for power dispatching and grid stability monitoring.
Retrofit Projects: Used to bridge the gap between existing analog CT/VT wiring and modern digital IEC 61850 protection systems.
Installation and Maintenance
Installation
CT Short-Circuiting: Critical! Never disconnect the current transformer wiring from the module while the primary circuit is energized. Always short-circuit the CT secondary terminals first to avoid lethal high voltages.
Grounding: Ensure the M8 grounding screw on the module or the subrack is connected to the station ground to maintain the integrity of the isolation barrier.
Terminal Tightness: Check that all screw terminals are torqued correctly; loose connections on CT circuits can lead to arcing and module failure.
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Maintenance
Phase Accuracy Check: During scheduled outages, perform a secondary injection test to ensure the 500TRM02 is converting values within its ±0.5% accuracy range.
Visual Inspection: Check for signs of localized overheating (discoloration) near the input terminals, which may indicate a high-burden or poor connection.
Cleaning: Use a lightly moistened cloth with mild detergent to clean the front panel. Do not allow liquids to enter the module casing.
Other Models in the Same Series
Model Description
500TRM01 Standard Analog Input Transformer (Earlier Revision)
500TRM03 Specialized high-current version for industrial drives
500BIO01 Binary Input/Output interface module
500CPU05 Central Processing Unit that processes the TRM signals
500CUM05 Central Unit Management Module
Peer Tip: When replacing a 500TRM02. double-check your CT Ratio settings in the HMI.
If the new module is installed but the settings are not refreshed, you may receive “Differential Current Alarm” errors due to scaling mismatches.