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How is differential protection calculated for a VAMP 265 relay?

FA180205

28/11/2018

Issue
User wishes to know how differential protection is calculated for VAMP 265 relay

Product Line
VAMP 200 series

Environment
Calculations

Resolution
Differential protection stage in VAMP 265 is calculated based on fundamental frequency phasors which are calculated using discrete Fourier transforms (DFT).
The sampling rate is 32 samples per cycle and the DFT sampling window width is one cycle.
The fundamental frequency current phasors are calculated every ten milliseconds.