4.4.1.10
Technical revision history
Table 241:
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
4.4.2
Phase discontinuity protection PDNSPTOC
4.4.2.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Phase discontinuity protection
PDNSPTOC
I2/I1>
46PD
4.4.2.2
Function block
A070688 V1 EN
Figure 110:
Function block
4.4.2.3
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.
4.4.2.4
Operation principle
The function can be enabled and disabled with the
Operation
setting. The
corresponding parameter values are "On" and "Off".
Section 4
1MRS757454 D
Protection functions
234
611 series
Technical Manual
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