4.3.5.2 Function block
Figure 302: Function block
4.3.5.3 Functionality
The high-impedance differential protection function HIxPDIF is a general
differential protection. It provides a phase-segregated short circuit protection for
the busbar. However, the function can also be used for providing generator, motor,
transformer and reactor protection.
The function starts and operates when the differential current exceeds the set limit.
The operate time characteristics are according to definite time (DT).
The function contains a blocking functionality. It is possible to block the function
outputs, timer or the whole function.
4.3.5.4 Operation principle
The function can be enabled and disabled with the
Operation
setting. The
corresponding parameter values are "On" and "Off".
The operation of HIxPDIF can be described with a module diagram. All the modules
in the diagram are explained in the next sections.
1MRS757644 H
Protection functions
620 series
Technical Manual
583
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