ABB Relion 630 Series RET630 Product Manual page 41

ABB
Transformer Protection and Control
RET630
Product version: 1.1
Table 47. Three-phase current inrush detection (INRPHAR) main settings
Parameter
Start value (Ratio of
the 2nd to the 1st
harmonic leading to
restraint)
Operate delay time
Table 48. Transformer differential protection for two-winding transformers (TR2PTDF)
Characteristic
Operation accuracy
1)2)
Operate time
Reset time
Reset ratio
Retardation time
Suppression of harmonics
1) Differential current before fault = 0.0 × I
2) Includes the delay of the output contact value and f
Function
INRPHAR
INRPHAR
Biased low stage
Instantaneous high
stage
, f = 50 Hz. Injected differential current = 2.0 × set operate value
n n
= 50 Hz
n
Value (Range)
5...100 %
0.02...60.00 s
Value
At the frequency f = f
n
±1.5% of the set value or ±0.002 × I
Typical 35 ms (±5 ms)
Typical 17 ms (±5 ms)
< 30 ms
Typical 0.96
< 35 ms
DFT: -50 dB at f = n x f
n
...
1MRS756978 D
Issued: 2011-05-18
Step
1
0.001
n
, where n = 2, 3, 4, 5,
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