6.5.2 SETTING GUIDELINES (DIRECTIONAL ELEMENT)
With directional earth faults, the residual current under fault conditions lies at an angle lagging the polarising
v
oltage. Hence, negative RCA settings are required for DEF applications. This is set in the cell I> Char Angle in the
relevant earth fault menu.
We recommend the following RCA settings:
● Resistance earthed systems: 0°
● Distribution systems (solidly earthed): -45°
● Transmission systems (solidly earthed): -60°
P64x Chapter 9 - Current Protection Functions
P64x-TM-EN-1.3 221
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