ABB RET630 - Three-Phase Inrush Current Detection; Thermal Overload Protection, Two Time Constants

Table 41. Three-phase inrush current detection (INRPHAR)
Characteristic Value
Operation accuracy At the frequency f = f
n
Current measurement:
±1.5% of the set value or ±0.002 x I
n
Ratio I2f/I1f measurement:
±5.0% of the set value
Reset time +35 ms / -0 ms
Reset ratio Typical 0.96
Operate time accuracy +30 ms / -0 ms
Table 42. Three-phase inrush detection (INRPHAR) main settings
Parameter
Function Value (Range) Step
Start value (Ratio of
the 2nd to the 1st
harmonic leading to
restraint)
INRPHAR 5...100 % 1
Operate delay time INRPHAR 0.02...60.00 s 0.001
Table 43. Thermal overload protection, two time constants (T2PTTR)
Characteristic
Value
Operation accuracy At the frequency f = f
n
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% or ±1000 ms
1)
Overload current > 1.2 x Operate level temperature, Current reference > 0.50 p.u.
Table 44. Thermal overload for protection, two time constants (T2PTTR) main settings
Parameter
Function Value (Range) Step
Temperature rise T2PTTR 0.0...200.0 deg 0.1
Max temperature T2PTTR 0.0...200.0 deg 0.1
Operate temperature T2PTTR 80.0...120.0 % 0.1
Weighting factor p T2PTTR 0.00...1.00 0.01
Short time constant T2PTTR 60...60000 s 1
Current reference T2PTTR 0.05...4.00 pu 0.01
Transformer Protection and Control 1MRS756788 A
RET630
Product version: 1.0 Issued: 15.09.2009
ABB 35