Non-symmetry calculations

Non-symmetrical and single-phase conditions are implemented using the method of symmetrical components (ІЕС 60909).

The following types of non-symmetry are implemented in DAKAR: transversal asymmetry, longitudinal asymmetry (open phase), and shunt reactors asymmetry (open phase).

Unlike most industrial programs for calculating short-circuit currents, DAKAR takes into account the actual electromotive force of power supplies based on steady state. This allows to obtain the actual rated short-circuit currents.

Required data

Results

models of electrical network elements

network model
power transmission lines models
transformer models
OLTC and NLTC models
generation models
PV and WPP models

neutrals operational modes

symmentry of nodes, lines, and reactors

Results

all types of short circuits

currents in the place of short circuit
voltages in the place of short circuit
currents in electrical network components
voltages in the electrical network nodes
power supply currents
total resistance of the electrical network relative to the location of the short circuit

single-phase circuit

currents in the place of circuit
voltage in circuit
selection/testing of an arc-quenching reactor
currents in electrical network components
voltages in the electrical network nodes
power supply currents
total resistance of electrical network relative to the location of the circuit

asymmetric network mode

assessment of permissible asymmetry in generator currents
phase currents in electrical network components
phase and interphase voltages in the electrical network nodes