What is Potier method?
Potier triangle method: This method depends on the separation of the leakage reactance of armature and its effects. It is used to obtain the leakage reactance and field current equivalent of armature reaction. It is the most accurate method of voltage regulation.
What is the Zpf method of finding voltage regulation?
Procedure to Obtain Voltage Regulation by ZPF Method First of all, we draw the phasor diagram of the alternator at lagging power factor as shown in the figure. In the phasor diagram, The phasor OA represents the terminal phase voltage (V) at full-load. It is taken as the reference phasor, thus drawn horizontally.
What is air gap line in Potier method?
The line OB tangent to O.C.C. is drawn called an air-gap line. The point P is obtained at rated terminal voltage while the alternator delivering full-load current at ZPF lagging. From P, PQ is drawn equal to OA and a line QR parallel to air-gap line which intersects O.C.C. at point R.
What is Zpf test?
Zero Power Factor (ZPF) for regulation of alternator: This Zero power factor (ZPF) method is used to determine the voltage regulation of synchronous generator or alternator. This method is also called Potier method.
Is zero power factor possible?
Generally, the occurrence of the Zero Power factor is not possible in practice because there is no pure capacitive and pure inductive load available. Any capacitive or inductive load has some resistance. The lagging power factor can be improved by Capacitors, synchronous motors, etc.
What is the slip test?
The slip test is a simple no-load test, which is used to determine the direct-axis and quadrature-axis synchronous reactances of a salient-pole synchronous machine. In this test, a small voltage at rated frequency is applied to the 3-phase stator winding of the synchronous machine.
In which circuit the power factor is zero?
purely inductive circuit
Power Factor Values For the purely inductive circuit, the power factor is zero, because true power equals zero.
What is XD and XQ?
‘xd’ and ‘xq’ (direct axis and quadrature axis reactance) of a salient pole alternator.
Why it is called as slip test?
What is the SI unit of EMF?
Despite its name, electromotive force is not actually a force. It is commonly measured in units of volts, equivalent in the metre–kilogram–second system to one joule per coulomb of electric charge.
What is difference between MMF and EMF?
When there is a current flow through the conductor coil, a force is produced to drive the magnetic flux or magnetic field lines. This force is called MMF or magnetomotive force. The EMF or electromotive force is the force responsible for the flow of electrons or current in a closed circuit.