4.4.2.2 Function block
A070688-ANSI V1 EN
Figure 299: Function block
4.4.2.3 Functionality
The phase discontinuity protection function 46PD is used for detecting unbalance
situations caused by broken conductors.
The function picks up and trips 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.
46PD trips 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 “Enable” and “Disable”.
The operation of 46PD can be described by using a module diagram. All the modules in
the diagram are explained in the next sections.
GUID-1A3E3A3D-D45B-4A88-8D65-CBE389ED1518 V1 EN
Figure 300: Functional module diagram
Section 4 1MAC059074-MB A
Protection functions
594 615 series ANSI
Technical Manual
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