ABB Relion 630 Series RET630 Product Manual page 39

ABB
Transformer Protection and Control
RET630
Product version: 1.1
Table 42. Negative-sequence overcurrent protection (NSPTOC)
Characteristic
Operation accuracy
1)2)
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite time mode
Operate time accuracy in inverse time mode
Suppression of harmonics
1) Operate curve type = IEC definite time, negative sequence current before fault = 0.0, f
2) Includes the delay of the signal output contact
3) Maximum Start value = 2.5 × I
Table 43. Negative-sequence overcurrent protection (NSPTOC) main settings
Parameter
Start value
Time multiplier
Operate delay time
Operating curve
1)
type
1) For further reference please refer to the Operating characteristics table
I = 2 × set Start
Fault
value
I = 10 × set Start
Fault
value
, Start value multiples in range of 1.5 to 20
n
Function
NSPTOC
NSPTOC
NSPTOC
NSPTOC
Value
At the frequency f = f
n
±1.5% of the set value or ±0.002 × I
Typical 23 ms (±15 ms)
Typical 16 ms (±15 ms)
< 40 ms
Typical 0.96
< 35 ms
±1.0% of the set value or ±20 ms
±5.0% of the theoretical value or ±20 ms
DFT: -50 dB at f = n × f
n
...
n
Value (Range)
0.01...5.00 pu
0.05...15.00
0.04...200.00 s
Definite or inverse time
Curve type: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
13, 14, 15, 17, 18, 19
1MRS756978 D
Issued: 2011-05-18
n
3)
, where n = 2, 3, 4, 5,
= 50 Hz
Step
0.01
0.05
0.01
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