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Power system analyses

Power system analyses are an essential part of electrical power system design. Calculations and simulations are performed to verify that the electrical system, including the system components, are correctly specified to perform as intended, withstand expected stress and be protected against failures.

International standards and local regulations are used as basis for robust system designs. They include requirements and recommendations for protection of personell and equipment, system response and equipment performance. Together with equipment ratings, regulations and standards form the basis for evaluation of calculation and simulation results.

We utilize several software packages for power system analyses. Calculations and simulation using phasors as well as instantaneous quantities are performed. Instantaneous quantities are typically used when higher accuracy or higher level of detailing is required.

We perform power system analyses in all project phases; from early concept, through engineering, to "as built" and throughout the operational phase of the installation. The level of detailing and accuracy of the models and results increase towards the "as built" and operational phases. For many installations, the models are validated by measurements of the electrical system performance in operation. A validated "as built" model provides significant advantages when used for decision support throughout the installation's operational phase and for verification of proposed future installation modifications.

Power system analyses include:

  • Load flow analyses
  • Short circuit and fault analyses
  • Protective device co-ordination and settings
  • Harmonic analyses
  • Dynamic and transient analyses
  • Earthing studies
  • Switching over voltages and insulation co-ordination

 

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