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Objective

Objective. Provide an analysis of the existing Waltz-Mill system. Determine the affect on the system of adding an additional motor load. Determine the necessary changes to safely add the new load and increase the power factor on T6 and T7. Existing System Analysis With SKM Power Tools Software.

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Objective

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Presentation Transcript

  1. Objective • Provide an analysis of the existing Waltz-Mill system. • Determine the affect on the system of adding an additional motor load. • Determine the necessary changes to safely add the new load and increase the power factor on T6 and T7.

  2. Existing System AnalysisWith SKM Power Tools Software • A Load Flow analysis was performed with the following data.

  3. Existing System AnalysisWith SKM Power Tools Software • The following values will be found under the current conditions • Percent loading for each feeder circuit • Percent loading for each transformer • Nominal voltage and percent voltage drop at each switchgear • Optimal transformer taps

  4. System Analysis with new load • 500hp motor load added to secondary bus T7. • Determine the size of the cable and breaker. • Increase power factor on secondary bus of T6 and T7 to .97 by adding a capacitor bank.

  5. Results and Recommendations • Load flow analysis of existing system before tap optimization. • Includes percent loading for all transformers and feeders.

  6. Results and Recommendations • Tap settings were optimized to minimize loss in the system. Load Flow results with optimized tap settings

  7. Results and Recommendations • The full load ampacity for the motor was found with the equation for FLA. • The breaker was sized at 125% FLA. • The size of the capacitor bank needed to improve the PF to .97 was found with the equation for QB. Added motor and capacitor bank to T7

  8. Results and Recommendations Added capacitor bank to correct T6 power factor to 0.97

  9. Results and Recommendations • The motor drew up to 683.92A • 3-1/C, 500MCM, nonmagnetic cable was chosen (ampacity of 810A) • A GE SK, Spectra motor circuit protector with trip settings between 600-1200A was selected. • This trip current should be set to 800A. Load flow analysis of system with motor and capacitor banks added

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