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 240: Function block
4.4.2.3 Functionality
The phase discontinuity protection 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".
The operation of phase discontinuity protection can be described by using a module
diagram. All the modules in the diagram are explained in the next sections.
Section 4 1YHT530004D05 D
Protection functions
452 615 series
Technical Manual
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