there is none
my question is what is the formula for pressure?
The excitation current is provided by a small self-excited pilot generator, attached to the same shaft as the alternator's rotor.
To test the excitation current of a transformer, you can perform an open-circuit test, where the primary winding is connected to the rated voltage while the secondary winding is left open. Measure the current flowing through the primary winding using an ammeter; this current is the excitation current. It's essential to ensure the transformer is at the specified voltage and frequency during the test for accurate results. Additionally, record the voltage and power factor for further analysis if needed.
the expression for calculating maximum current through the zener diode is : Izmax=Pzmax / Vz
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The formula for calculating current in a circuit when given the values of power and resistance is i p/a.
Ratio Analysis = Current Asset / Current Liabilities
E=Vt + Ia jXS Where E excitation voltage Vt Terminal voltage Stator Current Ia Xs synchronous Reactance
The formula for calculating resistance in an electrical circuit is R V/I, where R is the resistance, V is the voltage, and I is the current.
The formula for calculating the percent of weight loss is: (Initial weight - Current weight) / Initial weight x 100.
The formula for calculating weight loss percentage is: (Initial Weight - Current Weight) / Initial Weight x 100.
The formula you are looking for is I = Watts/ Voltage, I = 3000/voltage.
This is the current level needed to energize a transformer to its rated voltageThe clue is in the name! 'Excitation' means to create a magnetic field. So the excitation current is the current drawn from the supply which sets up the magnetic field around the core.
The formula for calculating the maximum voltage in an electrical circuit is V I R, where V is the voltage, I is the current, and R is the resistance.
I = E/R or Current = Voltage/Resistance (Ohm's Law)
Excitation current Io = Iw + Iu
Over Excitation is a condition when the Excitation System is providing too much field current and as a result, the rotor of the generator will over heat. The Excitation System is equipped with an Over Excitation Limiter. This limiter acts to reduce the Excitation Current if this condition exists Underexcitation is a condition when the generator is not getting enough Excitation Current. If the generator does not get enough Excitation Current, it can be un-synchronized with the grid. We call this slipping a pole. If this occurs, the generator can be severely damaged. Kelly Thompson Engineering Lead Siemens Energy Alpharetta GA