ABB REF545KM133AAAB｜Feeder Terminals｜

1. Condition Monitoring Functions

The REF 54_ feeder terminals include dedicated condition monitoring function blocks to supervise the health and performance of primary equipment and protection circuits.

Available monitoring functions include:

Energizing current and voltage input circuit supervision
Monitors the integrity of current transformer (CT) and voltage transformer (VT) input circuits.
Detects abnormal conditions such as broken wires or signal loss.
Operation time counter
Records the operating time of equipment.
Supports maintenance planning based on operating hours.
Circuit breaker electrical wear monitoring
Calculates circuit breaker contact wear based on switching operations and interrupted currents.
Helps optimize breaker maintenance intervals.
Scheduled maintenance monitoring
Provides maintenance reminders based on predefined time intervals or operating conditions.
Trip circuit supervision
Continuously monitors the trip circuit availability.
Detects failures in the breaker trip path before a fault occurs.
Circuit breaker travel time monitoring
Measures breaker opening and closing travel times.
Identifies mechanical problems such as slow operation or increased operating time.
2. General Functions

The REF 54_ terminals provide additional general-purpose functions that can be used within programmable logic configurations.

Typical applications include:

MMI backlight activation
Controls the local operator interface display backlight.
Switchgroup functions
Enables configurable grouping and control of settings or signals.
Reset functions
Allows resetting of:
Operation indications
Latched output signals
Registers
Disturbance recorder data

These functions improve operator interaction, system flexibility, and event management.

3. Communication Functions

The REF 54_ feeder terminal supports serial communication interfaces for integration with substation automation systems.

Supported communication protocols:

Protocol Application
SPA bus ABB proprietary communication protocol for relay monitoring and control
LON (Local Operating Network) High-performance substation communication network for distributed automation

Communication functions allow:

Remote monitoring
Parameter setting
Event and alarm reporting
Data exchange with higher-level control systems
4. Standard Logic Functions

Standard functions provide programmable logic capabilities for feeder automation and control applications.

They are commonly used for:

Interlocking
Prevents incorrect switching operations.
Ensures safe operating sequences.
Alarm processing
Generates and manages operational alarms.
Control sequencing
Implements automated switching sequences and operational procedures.
Flexible Logic Configuration

The logic functions can be freely interconnected with:

Protection functions
Measurement functions
Power quality functions
Control functions
Condition monitoring functions
General-purpose functions

Additional connection possibilities include:

Digital inputs and outputs
LON network inputs and outputs

These connections are configured using the Relay Configuration Tool, allowing users to create customized protection and automation schemes without additional hardware.