ABB REF545KB133AAAA｜Feeder Terminals｜

These feeder terminals integrate a comprehensive set of functions, including:

Protection functions
Measurement functions
Power quality functions
Control functions
Condition monitoring functions
General functions
Communication functions
Standard functions

The individual function blocks are described in detail in the ABB technical documentation package “Technical Descriptions of Functions” (1MRS 750889-MCD).

Protection Functions

Protection is one of the most important capabilities of the REF 54_ feeder terminal family. The protection function blocks operate independently, with each function block having its own:

Parameter settings
Setting groups
Fault recording capability
Event data storage
Protection logic

The feeder terminals support both modern sensor technologies and conventional instrument transformers.

Current-Based Protection

Protection functions based on current measurement can use:

Rogowski coil sensors
Conventional current transformers (CTs)

Rogowski coil technology provides advantages such as:

Wide measurement range
High linearity
Reduced saturation effects
Compact installation design
Voltage-Based Protection

Voltage protection functions can be implemented using:

Voltage dividers
Conventional voltage transformers (VTs/PTs)

The supported protection functions depend on the selected functionality level of the feeder terminal. The available protection options are defined in the “Functionality levels, protection functions” ordering table.

Typical protection functions available in the REF 54_ family include:

Overcurrent protection
Earth-fault protection
Undervoltage protection
Overvoltage protection
Frequency protection
Directional protection
Circuit breaker failure protection
Thermal overload protection
Auto-reclosing functions
Fault recording