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NERC Training

NERC RC Formulas

QuestionAnswer
OHMs Law Voltage = Current x Resistance E or V = I·R, R = V/I, I = V/R
Power (Single Phase) Power = Voltage x Current P = V·I (single phase)
Total Power S = √3 x Vₗ₋ₗ x I
Power (Three Phase) √3 x Vₗ₋ₗ x I x pf
PowerLosses I²∙R all the losses happened due to the Resistance
System Load Total Generation – Net Interchange Actual
Calculating Number of Poles in a Generator or Speed in RPM Np = 7200 is simplified form of: where N is RPM and p is # of poles, f = 60.00 Hz
ACE (NIₐ - NIₛ) - 10B (Fₐ - Fₛ) Iₘₑ Iₘₑ is a term in the ACE equation that can be used to account for any tie line meter errors. It is an operator input value that can be used to manipulate the ACE reading.
Governor Droop MW/Hz ratio 5% = 3 Hz range (60.00 x .05) @ +/- 0.036 Hz the governor will respond in proportion to their MW rating (59.96 Hz)
Power Triangle MVA² = MW²+ MVAR² common values are 3, 4, 5 and 6, 8, 10
Power Factor MW/MVA ratio of real power to total power (efficiency)
Impedance Z²= R² + (XL – XC)² the combination of Resistance, Inductive reactance and Capacitive reactance
Inductive Reactance XL = 2πfL
Capacitive Reactance XC = 1/2πfC
MVAR output MVAR rated x (Voltage actual/Voltage rated)²
ATC (Available Transfer Capability) Total Transfer Capability (TTC) – Reserve Margins TTC is a calculated value based on conditions and expected power flows.
Phase angle degree of difference where one waveform leads/lags another waveform in the power system. It is the angular separation between two currents, two voltages, or current and voltage waves. This is a generic term.
Voltage angle degree of change between two voltages in the system: usually voltage at a bus and a reference voltage.
Power angle The measure of the voltage angle differences between two separated locations in the power system, usually two different buses.
How Does MVAR Travel? from high voltage magnitude to low voltage magnitude
How Does MW Travel? from a higher voltage angle to lower voltage angle (downhill on the power angle)
Created by: Danzel513
 

 



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