ABB RED615 Technical Manual page 391

1YHT530004D05 D
615 series
Technical Manual
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Figure 205: Functional module diagram. I_x1 and I_x2 represent the phase
currents of winding 1 and winding 2
Differential calculation
TR2PTDF operates phase-wise on a difference of incoming and outgoing currents.
The positive direction of the currents is towards the protected object.
I
W 1
Winding 1
(usually HV)
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Figure 206: Positive direction of the currents
I I I
W 1 W 2
= +
d
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Protection functions
I
W 2
Winding 2
(usually LV)
Section 4
(Equation 44)
385