Table 97. Three-phase thermal protection for feeders, cables and distribution transformers (T1PTTR) main settings
Parameter
Function
Value (Range)
Step
Env temperature Set
T1PTTR
-50...100°C
1
Current reference
T1PTTR
0.05...4.00 × I
n
0.01
Temperature rise
T1PTTR
0.0...200.0°C
0.1
Time constant
T1PTTR
60...60000 s
1
Maximum temperature
T1PTTR
22.0...200.0°C
0.1
Alarm value
T1PTTR
20.0...150.0°C
0.1
Reclose temperature
T1PTTR
20.0...150.0°C
0.1
Current multiplier
T1PTTR
1...5
1
Initial temperature
T1PTTR
-50.0...100.0°C
0.1
Table 98. Three-phase thermal overload protection, two time constants (T2PTTR)
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 x I
n
(at currents
in the range of 0.01...4.00 x I
n
)
Operate time accuracy
1)
±2.0% of the theoretical value or ±0.50 s
1)
Overload current > 1.2 x Operate level temperature
Table 99. Three-phase thermal overload protection, two time constants (T2PTTR) main settings
Parameter
Function
Value (Range)
Step
Temperature rise
T2PTTR
0.0...200.0°C
0.1
Max temperature
T2PTTR
22.0...200.0°C
0.1
Operate temperature
T2PTTR
80.0...120.0%
0.1
Short time constant
T2PTTR
6...60000 s
1
Weighting factor p
T2PTTR
0.00...1.00
0.01
Current reference
T2PTTR
0.05...4.00 × I
n
0.01
Operation
T2PTTR
1 = on
5 = off
-
1MRS759144 A
REX640
Product version: 1
60
ABB
Summary of Contents for RELION REX640
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