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  • THEORY
  • MODELING  &  TOOLS
  • PSSE TUTORIALS
  • PYTHON
  • PSSE AUTOMATION
  • SHORT CIRCUIT
  • FAQ
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MODELING and TOOLS

  • TLine, Gen, Xfmr Estimators
  • TLine, Gen, Xfmr Code Creators
  • Generation Plant Modeling
  • Cable Parameter Estimator
  • ----------------- TOOLS -----------------
  • Compensated Bus ΔV
  • Interpolation Calculator
  • Ferranti Calculator
  • Line Dropping Calculator
  • Long Line Model Calculator
  • Motor Starting Calculator
  • Parallel Xfmr Flow Calculator
  • Power Factor Calculator
  • Phase-Shifting Xfmr Power Flow
  • PST Flicker Calculator
  • PU - Physical Calculator
  • PU Base Change Calculator
  • Series Capacitor Voltage Rise
  • Series Line Compensation
  • SIL Calculator & St.Clair Plot (us)
  • SIL Calculator & St.Clair Plot (metric)
  • Two Bus Line Flow Calculator
  • Test Report Calculator (2W)
  • Test Report Calculator (3W)
  • Δ - T - Δ Converter (3W)
  • Xfmr Tap Calculator
  • Z-Y Converter

Motor Starting Calculator

Method1... Use Locked Rotor Code

Method2... Use Starting / Running Current Factor

If the System Three Phase Short Circuit MVA is Known at the Point of Motor Connection... The Motor Starting Voltage Dip can be Estimated:

Less than 80% starting voltage is generally considered unacceptable.
The required torque may be inadequate to reach full speed and the resulting voltage dip could affect other loads connected to the same circuit.
An 80% motor terminal voltage will reduce the torque by 36%.

A realistic motor start analyis requires that the motor be modeled
at a bus with the nominal voltage = motor nameplate voltage.
This requires modeling the step down transformers and impedances.

NEMA motor codes
Defaults Equations
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