Technical Data - ABB REL650 series Technical Manual

Section 7
Current protection
7.8.7
7.9
7.9.1
248
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'.

Technical data

Table 119: UC2PTUC (37) Technical data
Function
Low-set step of undercurrent limit, (step 1)
High-set step of undercurrent limit, (step 2)
Time delayed operation of low-set step, (step 1)
Time delayed operation of high-set step, (step 2)
Reset ratio
Thermal overload protection, one time constant
Fahrenheit/Celsius LFPTTR/LCPTTR (26)
Identification
Function description
Thermal overload protection, one time
constant, Fahrenheit
Thermal overload protection, one time
constant, Celsius
Setting range
IBase in
(5.0-100.0)% of
steps of 1.0%
IBase in
(5.0-100.0)% of
steps of 1.0%
(0.000-60.000) s in steps of
1 ms
(0.000-60.000) s in steps of
1 ms
<105%
IEC 61850 IEC 60617
identification identification
LFPTTR
LCPTTR
1MRK 506 335-UUS A
Accuracy
± 1.0 % of I
n
± 1.0 % of I
n
± 0.5 % ± 25 ms
± 0.5 % ± 25 ms
ANSI/IEEE C37.2
device number
26
26
Technical manual