D05125R01.20
F-PRO 116 User Manual
5-1
5 Protection Functions and Specifications
This section describes the equations and algorithms that are implemented in the F-PRO 116 relay
Protection functions.
The available functions are 50-1, 50-2, 51, 50N-1, 50N-2, 51N, 50G-1, 50G-2, 51G, 64/50SEF-1,
64/50SEF-2, 64/51SEF, 46/50, 46/51, 74TCS-1, 74TCS-2, 49, 50BF, 46BC, 81HBL2, 79. These
functions are explained below with setting ranges and logic diagrams.
The protection functions have user-settable pick-up and drop-off delays. The Alarm and Trip
outputs are initiated when the function's input value exceeds the set pick-up value. When Alarms
or Trips occur, programmable front LEDs turn on and output contacts close. The mapping of
protection functions to LEDs and output contacts is performed in the Output Matrix. The output
contacts and LEDs are user configurable for Self-Reset or Hand Reset.
A complete list of the settings and their range values can be found in “IED Settings and Ranges”
5.1 Current Protection Functions
50/51 Phase Overcurrent
The Phase overcurrent has 2 stages of time delayed or instantaneous (50) and one stage of IDMTL
or time delayed or instantaneous (51) protection.
Phase overcurrent protection is designed to protect feeder, transformer, reactor, capacitor banks
and bus-bar as main or back-up protection depending on application needs. The user can apply
inverse (51), selectable definite time (51) and/or instantaneous overcurrent protection (50).
Each phase current, after the necessary filtering, is compared with the set pickup current value.
When the measured current is greater than the set pickup value, the enabled function will
operate after the pickup delay, according to the set inverse curve (51) or instantaneously (50).
The function is provided with the additional feature of "Inrush Blocking". This is provided to block
the function from operation when second harmonic current is present along with the
fundamental (when used in transformers application). At the time of transformer charging, there
is high magnitude of inrush current which may cause the relay to pick up for the particular
function if inrush blocking is not enabled.
Each stage (50-1, 50-2 and 51) can also be independently blocked via external input status which
can be configured from the input matrix.
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