ABB RELION 620 Series Technical Manual page 580

Section 4
Protection functions
4.3.5.2
4.3.5.3
4.3.5.4
574
Function block
GUID-A8C4ADB7-8892-422F-8B00-873C47A66A3E V1 EN
Figure 292: Function block
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.
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 F
620 series
Technical Manual