Standard measurements include:

Three-phase current
Neutral current
Three-phase voltage
Residual voltage
System frequency
Active power
Reactive power
Power factor

Additional measurement functions are also available depending on the selected configuration.

Pulse Counter Inputs

As standard, the REF 54x provides pulse counter inputs for integrating external metering devices such as energy meters or water and gas flow meters.

The number of available pulse inputs depends on the product model:

Model Pulse Counter Inputs
REF 541 7
REF 545 10

These inputs support advanced monitoring and utility metering applications.

Disturbance Recorder

The integrated transient disturbance recorder captures detailed information during system disturbances, supporting post-fault analysis and troubleshooting.

Recording capabilities include:

Up to 16 analog current or voltage waveforms
Up to 16 digital logic signals

Sampling rates are:

2.0 kHz at 50 Hz system frequency
2.4 kHz at 60 Hz system frequency

The user can configure the recording duration based on:

Number of analog channels used
Selected sampling frequency
Desired recording length

The total number of stored recordings varies according to these settings.

COMTRADE Export

Recorded disturbance data can be exported using the DR-Collector Tool, which converts the recordings into the industry-standard COMTRADE format.

The DR-Collector Tool is supported by:

CAP501
CAP505 relay engineering software

This allows engineers to perform detailed disturbance analysis using standard power system analysis tools.

Power Quality Functions

The REF 54x includes integrated power quality monitoring, enabling continuous evaluation of voltage and current waveform quality in accordance with international standards.

Harmonic Analysis

The device measures:

Total Harmonic Distortion (THD) of voltage
Total Harmonic Distortion (THD) of current
Total Demand Distortion (TDD) of current
Individual harmonic components up to the 13th harmonic

These measurements help identify harmonic distortion caused by nonlinear loads and support compliance with power quality requirements.

Voltage Quality Monitoring

The REF 54x also monitors short-duration voltage variations, including:

Voltage sags
Voltage swells
Short interruptions

These measurements are performed in accordance with IEC 61000-4-30, ensuring standardized and accurate power quality assessment.

Graphical Power Quality Analysis

The LIB 510 software provides visualization and analysis tools for:

Harmonic spectra
Voltage sag events
Voltage swell events
Short interruption records

These graphical tools simplify troubleshooting, reporting, and long-term power quality monitoring.

Key Benefits
Independent protection functions with dedicated settings and event recording
Support for both conventional CTs/VTs and modern Rogowski coils and voltage dividers
Comprehensive electrical measurements for system monitoring
Integrated pulse counter inputs for external metering applications
High-speed disturbance recording with COMTRADE export capability
Built-in harmonic and power quality analysis
IEC 61000-4-30 compliant voltage quality monitoring
Advanced visualization using ABB CAP501, CAP505, and LIB 510 software
Flexible configuration for utility and industrial medium-voltage feeder applications

The ABB REF 54x Feeder Terminal integrates advanced protection, precise measurement, disturbance recording, and power quality monitoring into a single intelligent platform, providing utilities and industrial users with a reliable solution for modern feeder automation and power system management.