Index

# RELAYS 101

### K0 Calculation

Enter Z0 and Z1 magnitudes and angles. Output is an example calculation for K0. Different protective relay manufacturers may have different methods of computing K0. K0 is the value known as Zero Sequence Compensation Factor. This is the value used in ground fault relaying to allow for accurate distance measurement. Compensation is needed because the phase and ground impedances are different. Unlike the phase fault distance measurements where (typically) both phases involved in the fault have the same impedance. K0 is only needed for accurate distance measurement in phase to ground faults.

K0 = (Z0-Z1)/3Z1

Z0 Magnitude : Z0 Angle (deg) :

Z1 Magnitude : Z1 Angle (deg) :

K0 Magnitude : K0 Angle (deg) :
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