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Emergency modes

Lecture



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

Ya = 0
Emergency modesEmergency modes

Phase voltages

Emergency modes

Currents in receiver phases:

Emergency modes

Vector diagram

Emergency modes

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 Emergency modes

Emergency modes

Voltage on receiver phases

Emergency modes

Vector diagram

Emergency modes

Currents in phases B and C:

Emergency modes

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

For node n:

Emergency modes

Line wire break

Emergency modes
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 Emergency modes are connected in series and half of the voltage Uc is connected to each of them

Emergency modes

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

Emergency modes

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Electrical Engineering, Circuit design

Terms: Electrical Engineering, Circuit design