Table 38. Negative phase-sequence overcurrent protection (NSPTOC) main settings
Parameter Function Value (Range) Step
Start value NSPTOC 0.01...5.00 pu 0.01
Time multiplier NSPTOC 0.05...15.00 0.05
Operate delay time NSPTOC 0.04...200.00 s 0.01
Operating curve
type
1)
NSPTOC Definite or inverse time
Curve type: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
13, 14, 15, 17, 18, 19
1) For further reference please refer to the Operating characteristics table
Table 39. Three-phase thermal overload (T1PTTR)
Characteristic
Value
Operation accuracy At the frequency f = f
n
Current measurement: ±0.5% 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 ±0.50 s
1)
Overload current > 1.2 x Operate level temperature, Current reference > 0.50 p.u.
Feeder Protection and Control 1MRS756380 A
REF630
Product version: 1.0 Issued: 15.09.2009
ABB 35
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