Table 73. Negative-sequence overcurrent protection (NSPTOC) main settings
Parameter
Function
Value (Range)
Step
Start value
NSPTOC
0.01...5.00 × I
n
0.01
Time multiplier
NSPTOC
0.025...15.000
0.005
Operate delay time
NSPTOC
40...200000 ms
10
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, see the Operation characteristics table
Table 74. Phase discontinuity protection (PDNSPTOC)
Characteristic
Value
Operation accuracy
Depending on the frequency of the measured current: f
n
±2 Hz
±2% of the set value
Start time
<70 ms
Reset time
Typically 40 ms
Reset ratio
Typically 0.96
Retardation time
<35 ms
Operate time accuracy in definite time mode
±1.0% of the set value or ±20 ms
Suppression of harmonics
DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
Table 75. Phase discontinuity protection (PDNSPTOC) main settings
Parameter
Function
Value (Range)
Step
Start value
PDNSPTOC
10...100%
1
Operate delay time
PDNSPTOC
100...30000 ms
1
Min phase current
PDNSPTOC
0.05...0.30 × I
n
0.01
Table 76. Residual overvoltage protection (ROVPTOV)
Characteristic
Value
Operation accuracy
Depending on the frequency of the measured voltage: f
n
±2 Hz
±1.5% of the set value or ±0.002 × U
n
Start time
1)2)
Minimum
Typical
Maximum
U
Fault
= 2 × set
Start value
48 ms
51 ms
54 ms
Reset time
Typically 40 ms
Reset ratio
Typically 0.96
Retardation time
<35 ms
Operate time accuracy in definite time mode
±1.0% of the set value or ±20 ms
Suppression of harmonics
DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
1)
Residual voltage before fault = 0.0 × U
n
, f
n
= 50 Hz, residual voltage with nominal frequency injected from random phase angle, results based on statistical distribution of 1000
measurements
2)
Includes the delay of the signal output contact
1MRS759144 A
REX640
Product version: 1
ABB
53
Summary of Contents for RELION REX640
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