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
Содержание Relion REC615
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