Directional Negative-Sequence Overcurrent Protection (Dnspdoc); Low-Voltage Ride-Through Protection (Lvrtptuv) - ABB REX640 Product Manual

REX640
Product version: 1
Table 110. Directional negative-sequence overcurrent protection (DNSPDOC)
Characteristic
Operation accuracy
Start time 1)2)
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite time mode
Suppression of harmonics
1) Measurement mode NPS, NPS current before fault = 0.0 × I
1000 measurements
2) Measured with static signal output (SSO)
Table 111. Directional negative-sequence overcurrent protection (DNSPDOC) main settings
Parameter
Start value
Directional mode
Operate delay time
Characteristic angle
Table 112. Low-voltage ride-through protection (LVRTPTUV)
Characteristic
Operation accuracy
1)2)
Start time
Reset time
Operate time accuracy
Suppression of harmonics
Number of Start phases = 1 out of 3, results based on statistical distribution of 1000 measurements
1) Tested for
2) Includes the delay of the signal output contact
64
I = 2 × set Start value
Fault
, f = 50 Hz, fault NPS current with nominal frequency injected from random phase angle, results based on statistical distribution of
n n
Function
DNSPDOC
DNSPDOC
DNSPDOC
DNSPDOC
Value
Depending on the frequency of the measured current: f
Current:
±1.5% of the set value or ±0.002 × I
Voltage:
±1.5% of the set value or ±0.002 × U
Phase angle:
±2°
Minimum Typical
31 ms 34 ms
Typically 40 ms
Typically 0.96
<35 ms
±1.0% of the set value or ±20 ms
RMS: No suppression
DFT: -50 dB at f = n × f , where n = 2, 3, 4, 5,...
n
Peak-to-Peak: No suppression
Value (Range)
0.05...5.00 × I
n
1 = Non-directional
2 = Forward
3 = Reverse
40...300000 ms
-179...180°
Value
Depending on the frequency of the measured voltage:
f ±2 Hz
n
±1.5% of the set value or ±0.002 × U
Typically 40 ms
Recovery time setting
Based on maximum value of
±1.0% of the set value or ±20 ms
DFT: -50 dB at f = n × f , where n = 2, 3, 4, 5,...
n
1MRS759144 A
±2 Hz
n
n
n
Maximum
37 ms
Step
0.01
-
10
1
n
ABB