GEK-113308
MIWII Directional Power Protection System
2-7
2 PRODUCT DESCRIPTION
2.5 POWER ELEMENTS
2
MAXIMUM POWER - REVERSE
MINIMUM POWER- REVERSE
2.5.1
PROGRAMMABLE POWER ELEMENT(32_X) MIWII1000-MIWII2000
MIWII1000 provides three programmable power directional elements and MIWII2000 provides four programmable power
directional elements. Power is calculated in a single phase, considering the connection in voltage transformers.
For cases where the transformer voltage is phase-to-ground, the calculation will be:
P = 3*V*I* cos
Φ
Q = 3*V*I* sen
Φ
S = 3*V*I
where:
P = Active power in Secondary watts
Q = Reactive power in reactive VA
S = Apparent power in VA
V = Selected voltage (phase-to-ground)
I = Used current (from the same phase as voltage)
Φ
= Angle between current and voltage
For cases where the transformer is in phase-to-phase connection, the power value will be:
P =
√
3*V*I* cos (
Φ
-30º)
