Emergency modes

Star: phase A break in a three-phase three-wire symmetric system

Ya = 0


Phase voltages



Currents in receiver phases:



Vector diagram



Short circuit
In a three-phase symmetric system, a short-circuit phase A of the receiver occurred. In case of short circuit of phase A phase resistance



Voltage on receiver phases



Vector diagram



Currents in phases B and C:



The current of phase A is under the first Kirchhoff law.

For node n:



Line wire break


In a symmetric three-phase receiver the line wire A has broken.

The impedance of the phase of the sun is on the full linear voltage of the generator, and the equal resistance of the phases are connected in series and half of the voltage Uc is connected to each of them



The current phase of the sun does not change
Phase and linear currents with IA = 0