7.8.5
Settings
Table 117:
UC2PTUC (37) Group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
Operation
Disabled
Enabled
-
-
Disabled
Operation Disable / Enable
I1Mode
1 out of 3
2 out of 3
3 out of 3
-
-
1 out of 3
Number of phases required to operate for step
1
I1<
5.0 - 100.0
%IB
1.0
10.0
Current setting for step 1 in % of IBase
t1
0.000 - 60.000
s
0.001
5.000
Time delay for step 1
tReset1
0.000 - 60.000
s
0.001
0.000
Reset time delay for step 1
I2Mode
1 out of 3
2 out of 3
3 out of 3
-
-
1 out of 3
Number of phases required to operate for step
2
I2<
5.0 - 100.0
%IB
1.0
30.0
Current setting for step 2 in % of IBase
t2
0.000 - 60.000
s
0.001
2.000
Time delay for step 2
tReset2
0.000 - 60.000
s
0.001
0.000
Reset time delay for step 2
tPulse
0.01 - 2.00
s
0.01
0.10
Operate pulse duration
IBlk
5.0 - 100.0
%IB
1.0
5.0
Current setting for blocking in % of IBase
Table 118:
UC2PTUC (37) Non group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
GlobalBaseSelector
1 - 6
-
1
1
Selection of one of the Global Base Value
groups
7.8.6
Operation principle
Time delayed 2-step undercurrent protection (UC2PTUC, 37) function generates output
signals PICKUP and TRIP. The 2-steps in the function are identical, hence, only step1 is
explained below.
UC2PTUC (37) function compares the magnitude of the measured current with a set
current level,
I1<
. The undercurrent function operates and generates output signals,
PICKUP and PU_ST1, when the magnitude of the measured current is smaller than the set
current level
I1<
.
The low current condition also starts a definite time delay,
t1
. The current measuring
condition is based on a selected number of phases involved for operation according to
setting parameter,
I1Mode
. When the low current condition continues for longer time than
the set time
t1
, the UC2PTUC (37) function generates trip signals, TRIP and TRST1. The
1MRK 506 335-UUS A
Section 7
Current protection
247
Technical manual
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