ABB Relion 630 Series RET630 Product Manual page 40

Transformer Protection and Control
RET630
Product version: 1.1
Table 44. Three-phase thermal overload protection for transformers (T2PTTR)
Characteristic
Operation accuracy
1)
Operate time accuracy
1) Overload current > 1.2 x Operate level temperature, Current reference > 0.50 p.u.
Table 45. Three-phase thermal overload protection for transformers (T2PTTR) main
settings
Parameter
Temperature rise
Max temperature
Operate temperature
Weighting factor p
Short time constant
Current reference
Table 46. Three-phase current inrush detection (INRPHAR)
Characteristic
Operation accuracy
Reset time
Reset ratio
Operate time accuracy
40
Function
T2PTTR
T2PTTR
T2PTTR
T2PTTR
T2PTTR
T2PTTR
Value
At the frequency f = f
n
Current measurement: ±1.5% of the set value
or ±0.002 x I (at currents in the range of
n
0.01...4.00 x I )
n
±2.0% or ±1000 ms
Value (Range)
0.0...200.0 deg
0.0...200.0 deg
80.0...120.0 %
0.00...1.00
60...60000 s
0.05...4.00 pu
Value
At the frequency f = f
n
Current measurement:
±1.5% of the set value or ±0.002 x I
Ratio I2f/I1f measurement:
±5.0% of the set value
+35 ms / -0 ms
Typical 0.96
+30 ms / -0 ms
1MRS756978 D
Issued: 2011-05-18
Step
0.1
0.1
0.1
0.01
1
0.01
n
ABB