ABB RELION 620 Series Technical Manual page 614

Section 4
Protection functions
4.4.1.10
4.4.2
4.4.2.1
4.4.2.2
4.4.2.3
4.4.2.4
608
Technical revision history
Table 547: NSPTOC Technical revision history
Technical revision
B
C
D
E
Phase discontinuity protection PDNSPTOC
Identification
Function description
Phase discontinuity protection
Function block
A070688 V1 EN
Figure 311: Function block
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
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.
Operation principle
The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "On" and "Off".
Change
Minimum and default values changed to 40 ms for
Operate delay time setting
the
Step value changed from 0.05 to 0.01 for the
multiplier setting
Internal improvement
Internal Improvements
IEC 61850 IEC 60617
identification identification
PDNSPTOC I2/I1>
1MRS757644 F
Time
ANSI/IEEE C37.2
device number
46PD
/I exceeds the set limit.
2 1
620 series
Technical Manual