4.4.1.9 NSPTOC Monitored data
Table 741: NSPTOC Monitored data
Name Type Values (Range) Unit Description
START_DUR FLOAT32 0.00...100.00 % Ratio of start time / op-
erate time
NSPTOC Enum
1=on
2=blocked
3=test
4=test/blocked
5=off
Status
4.4.1.10 Technical data
Table 742: NSPTOC Technical data
Characteristic Value
Operation accuracy Depending on the frequency of the measured
current: f
n
±1.5% of the set value or ±0.002 × I
n
Start time
1, 2
Minimum Typical Maximum
I
Fault
= 2 × set
Start
value
I
Fault
= 10 × set
Start
value
23 ms
15 ms
26 ms
18 ms
28 ms
20 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
Operate time accuracy in inverse time mode ±5.0% of the theoretical value or ±20 ms
3
Suppression of harmonics
DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
4.4.2 Directional negative-sequence overcurrent protection
DNSPDOC (ANSI 67Q)
4.4.2.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Directional negative-sequence over-
current protection
DNSPDOC I2> -> 67Q
1
Negative sequence current before fault = 0.0, f
n
= 50 Hz, results based on statistical distribution
of 1000 measurements.
2
Includes the delay of the signal output contact.
3
Maximum
Start value
= 2.5 × I
n
,
Start value
multiples in range of 1.5...20.
1MRS759142 F Protection functions
REX640
Technical Manual
825
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