74
Time delayed residual overcurrent protection
(TEF)
Chapter 5
Current
Table 84:
Output signals for the TEF (TEF--) function block
3.6
Setting parameters
Path in local HMI: Settings/Functions/Groupn/EarthFault/TEF
Table 85:
Settings for the TEF (TEF--) function
Signal
Description
TRIP
Trip by TEF
TRSOTF
Trip by earth fault switch onto fault function
START
Non directional start
STFW
Forward directional start
STRV
Reverse directional start
Parameter
Range
Default
Unit
Description
Operation
Off, On
Off
-
Operating mode for TEF function
IMeasured
I4, I5
I4
-
Current signal used for earth fault func-
tion
Characteristic
Def, NI, VI, EI,
LOG
Def
-
Time delay characteristic for TEF protec-
tion
IN>
5 - 300
Step: 1
5
% of Inb
Start current for TEF function (I4b or I5b)
IMin
100 - 400
Step: 1
100
% of IN
Minimum operating current
t1
0.000 -
60.000
Step: 0.001
0.000
s
Independent time delay
k
0.05 - 1.10
Step: 0.01
0.05
-
Time multiplier for dependent time delay
tMin
0.000 -
60.000
Step: 0.001
0.050
s
Min. operating time for dependent time
delay function
Summary of Contents for REL 551-C1*2.5
Page 1: ...Technical reference manual ProtectIT Line differential protection terminal REL 551 C1 2 5 ...
Page 23: ...14 Introduction to the technical reference manual Chapter 1 Introduction ...
Page 39: ...30 Technical data Chapter 2 General ...
Page 63: ...54 Blocking of signals during test BST Chapter 3 Common functions ...
Page 71: ...62 Line differential protection phase segregated DIFL Chapter 4 Line differential protection ...
Page 89: ...80 Thermal phase overload protection THOL Chapter 5 Current ...
Page 101: ...92 Event function EV Chapter 7 Logic ...
Page 163: ...154 Terminal diagrams Chapter 11 Diagrams Figure 39 REL 551 C1 with DC switch ...