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ETAP follows recommended procedures to determine the required transformer size based on the use of factors including altitude, temperature, insulation, number of phases, cooling stage, etc.
ETAP enables you to use the operating values from load flow calculations or use total connected load as represented in the one-line diagrams. Tap Optimization enables you to plot the Mvar delivery curve versus generator voltage. |
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- Sizing based on actual connected or operating load
- ANSI & IEC standard types, classes, & ratings
- Considers ambient temperature, altitude, load growth, & load factors
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- ANSI/IEEE C57.116 Standard
- Optimize unit transformer turns ratio
- Considers system voltage variation
- Considers generation station auxiliary load
- Generator reactive capacity vs. voltage plots
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- ANSI/IEEE C57.116-1994
- IEC 60076-2 (liquid)
- IEC 60726 (dry)
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- Elevation & temperature factors
- Limit short circuit current
- Growth & load factors
- Include optional load projection
- Include optional spare loads
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- Voltage varying generator power flows
- Voltage varying transformer power flows
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- Primary & secondary lines/cables
- Auxiliary connected loads
- Local generation
- Calculated Mvar delivery curve
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- Operating load or connected load
- Required size
- One size larger & one size smaller
- Rated & maximum MVA
- Typical impedance values
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- Generator Mvar output vs. system voltage
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