Characteristic Value
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,…
4.3.1.10 Technical revision history
Table 420: NSPTOC Technical revision history
Technical revision Change
B Minimum and default values changed to 40
ms for the
Operate delay time
setting
C Step value changed from 0.05 to 0.01 for the
Time multiplier
setting
D Internal improvement
E Internal Improvements
4.3.2 Phase discontinuity protection PDNSPTOC
4.3.2.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Phase discontinuity protection PDNSPTOC I2/I1> 46PD
4.3.2.2 Function block
Figure 206: Function block
4.3.2.3 Functionality
The phase discontinuity protection function PDNSPTOC is used for detecting
unbalance situations caused by broken conductors.
The function starts and operates when the unbalance current I
2
/I
1
exceeds the set
limit. To prevent faulty operation at least one phase current needs to be above the
minimum level. PDNSPTOC operates with DT characteristic.
The function contains a blocking functionality. It is possible to block the function
output, timer or the function itself, if desired.
3
Maximum
Start value
= 2.5 × I
n
,
Start value
multiples in range of 1.5...20
1MRS758755 C Protection functions
REC615 & RER615
Technical Manual
415
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