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
343
