ABB Relion 620 Series - Three-Phase Thermal Overload Protection, Two Time Constants T2 PTTR

4.1.6.9 Technical data
Table 330: T1PTTR Technical data
Characteristic Value
Operation accuracy Depending on the frequency of the measured
current: f
n
±2 Hz
Current measurement: ±1.5% of the set value
or ±0.002 × I
n
(at currents in the range of
0.01...4.00 × I
n
)
Operate time accuracy ±2.0% of the theoretical value or ±0.50 s
4.1.6.10 Technical revision history
Table 331: T1PTTR Technical revision history
Technical revision Change
C Removed the Sensor available setting param-
eter
D
Added the AMB_TEMP input
E Internal improvement.
F Internal improvement.
4.1.7 Three-phase thermal overload protection, two time
constants T2PTTR
4.1.7.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Three-phase thermal overload pro-
tection, two time constants
T2PTTR 3Ith>T/G/C 49T/G/C
4.1.7.2 Function block
Figure 170: Function block
1
Overload current > 1.2 × Operate level temperature
1MRS757644 H Protection functions
620 series
Technical Manual
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