Directional Earth-Fault Protection (Defxpdef) Main Settings; Negative Phase-Sequence Overcurrent Protection (Nsptoc) - ABB RET620 Product Manual

Transformer Protection and Control
RET620
Product version: 2.0
Table 36. Directional earth-fault protection (DEFxPDEF) main settings
Parameter
Start Value
Directional mode
Time multiplier
Operate delay time
1)
Operating curve type
Operation mode
1) For further reference, refer to the Operating characteristics table
Table 37. Negative phase-sequence overcurrent protection (NSPTOC)
Characteristic
Operation accuracy
Start time 1)2)
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite time mode
Operate time accuracy in inverse time mode
Suppression of harmonics
1) Negative sequence current before fault = 0.0, f
2) Includes the delay of the signal output contact
3) Maximum Start value = 2.5 x I ,
n
ABB
Function
DEFLPDEF
DEFHPDEF
DEFLPDEF and DEFHPDEF
DEFLPDEF
DEFHPDEF
DEFLPDEF
DEFHPDEF
DEFLPDEF
DEFHPDEF
DEFLPDEF and DEFHPDEF
Start value
I = 2 x set
Fault
Start value
I = 10 x set
Fault
= 50 Hz, results based on statistical distribution of 1000 measurements
n
Start value multiples in range of 1.5 to 20
Value (Range)
0.010...5.000 x I
n
0.10...40.00 x I
n
1=Non-directional
2=Forward
3=Reverse
0.05...15.00
0.05...15.00
60...200000 ms
40...200000 ms
Definite or inverse time
Curve type: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19
Definite or inverse time
Curve type: 1, 3, 5, 15, 17
1=Phase angle
2=IoSin
3=IoCos
4=Phase angle 80
5=Phase angle 88
Value
Depending on the frequency of the current measured: f
±1.5% of the set value or ±0.002 x I
Minimum Typical
22 ms 24 ms
14 ms 16 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 x f , where n = 2, 3, 4, 5,...
n
1MRS757846 A
Step
0.005
0.01
0.01
0.01
10
10
±2 Hz
n
n
Maximum
25 ms
17 ms
3)
31