lengths of these signals are controlled by a pulse timer,
tPulse
. The PICKUP and TRIP
output signals can be reset instantaneous or time delay with the time setting,
tReset1
.
An included blocking step is used to block UC2PTUC (37) when the power is shut off. The
blocking step operates when all three phase currents are below the set value of
IBlk
.
Step 2 is exactly designed as step 1. All corresponding output signals and settings of step
2 are suffixed with ‘2’.
7.8.7
Technical data
Table 119:
UC2PTUC (37) Technical data
Function
Setting range
Accuracy
Low-set step of undercurrent limit, (step 1)
(5.0-100.0)% of
IBase in
steps of 1.0%
± 1.0 % of I
n
High-set step of undercurrent limit, (step 2)
(5.0-100.0)% of
IBase in
steps of 1.0%
± 1.0 % of I
n
Time delayed operation of low-set step, (step 1)
(0.000-60.000) s in steps of
1 ms
± 0.5 % ± 25 ms
Time delayed operation of high-set step, (step 2)
(0.000-60.000) s in steps of
1 ms
± 0.5 % ± 25 ms
Reset ratio
<105%
7.9
Thermal overload protection, one time constant
Fahrenheit/Celsius LFPTTR/LCPTTR (26)
7.9.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Thermal overload protection, one time
constant, Fahrenheit
LFPTTR
26
Thermal overload protection, one time
constant, Celsius
LCPTTR
26
Section 7
1MRK 506 335-UUS A
Current protection
248
Technical manual
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