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