1MAC309294-MB F Section 4
Protection functions
RER620 179
Technical Manual
4.1.7 Phase discontinuity protection 46PD
4.1.7.1 Identification
4.1.7.2 Function block
Figure 78: Function block
4.1.7.3 Functionality
The phase discontinuity protection 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.
4.1.7.4 Operation principle
The function can be enabled and disabled with the Operation setting. The corresponding
parameter values are Enable and Disable.
The operation of phase discontinuity protection can be described by using a module
diagram. All the blocks in the diagram are explained in the next sections.
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Phase discontinuity protection PDNSPTOC I2/I1> 46PD
To Next Page
Loading...
