Feeder Terminal
REF 541, REF 543, REF 545.
1MRS750443-MBG
44
The REF 541, REF 543 and REF 545 feeder
terminals differ from each other as to the
number of digital inputs and outputs as fol-
lows.
Terminals can optionally be ordered with an
ANSI front panel.
The functionality level determines the extent
of the selection of function blocks available
for the feeder terminal. For more detailed
information on the separate function blocks
included in each selection, please consult
your relay supplier.
Number of inputs/outputs
Number of inputs/outputs
REF 541
REF 543
REF 545
Digital inputs
15
25
34
Trip circuit supervision inputs
2
2
2
Power outputs (NO single-pole)
0
2
3
Power outputs (NO double-pole)
5
9
11
Signal outputs (NO)
2
2
4
Signal outputs (NO/NC)
5
5
8
Self-supervision outputs
1
1
1
Functionality levels, protection functions
FUNCTIONALITY LEVELS
ANSI
Code
IEC
Symbol
Function
Code
REF541/3/5
CONTROL
REF541/3/5
BASIC
REF541/3/5
MULTI
SHORT CIRCUITS
51-1
3I >
Three-phase non-directional
overcurrent, low-set stage
NOC3Low
X
X
51-2
3I >>
Three-phase non-dir.
overcurrent, high-set stage /
blockable overcurrent
NOC3High
X
X
51-3
3I >>>
Three-phase non-dir.
overcurrent, inst. stage /
blockable overcurrent
NOC3Inst
X
X
67-1
3I > ->
Three-phase directional o/c,
low-set stage
DOC6Low
X
X
67-2
3I >> -> Three-phase directional o/c,
high-set stage / blockable
overcurrent
DOC6High
X
X
67-3
3I >>> -> Three-phase directional o/c,
high-set stage / blockable
overcurrent
DOC6Inst
X
X
EARTH-FAULTS
51N-1
Io >
Non-directional earth-fault,
low-set stage
NEF1Low
X
X
51N-2
Io >>
Non-directional earth-fault,
high-set stage
NEF1High
X
X
50N-3
Io >>>
Non-directional earth-fault,
instantaneous stage
NEF1Inst
X
X
67N-1
Io > ->
Directional earth-fault,
low-set stage
DEF2Low
X
X
67N-2
Io >> -> Directional earth-fault,
high-set stage
DEF2High
X
X
67N-3
Io >>> -> Directional earth-fault,
instantaneous stage
DEF2Inst
X
X
59N-1
Uo >
Residual overvoltage,
low-set stage
ROV1Low
X
X
59N-2
Uo >>
Residual overvoltage,
high-set stage
ROV1High
X
X