Table 57. Three-phase thermal protection for feeders, cables and distribution transformers (T1PTTR)
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
1)
±2.0% of the theoretical value or ±0.50 s
1) Overload current > 1.2 × Operate level temperature
Table 58. 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 20.0...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 59. 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 60. 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 0.0...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
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