Potier triangle or zero power factor method the potier triangle determines the voltage regulation of the machines. The methods employed for determination of regulation are emf or synchronous impedance method, mmf or ampere turns method and the zpf or potier triangle method. For finding voltage regulation of an alternator, the method which gives most accurate result is a. Presumably you are talking about something called the zero power factor method. Voltage regulation of alternator and solved example youtube. The regulation of a 3phase alternator may be predetermined by conducting the open circuit oc and the sort circuit sc tests.
Total excitation fr is calculated by adding far and ff1. By gradually cutting out the rheostat r 3, reading of the ammeter a 2,01020a is adjusted to the rated current of the alternator and the corresponding field current a 1, 012a is noted down. Synchronous machines notes part2 electric equipment. Avoid direct contact with any voltage source and power line voltages. The main limitation of this method is that the method gives large values of synchronous reactance. The voltage regulation of an alternator can be determined by various. Voltage regulation of alternator and solved example. Stator the stator or armature is an iron ring, formed of laminations of silicon steel with. Zero power factorzpf or potier triangle method for regulation of. But while calculating voltage regulation of synchronous machine by zero power factor method or potier method we separate armature leakage reactance and armature reaction effects and calculate voltage regulation so we get almost correct value of voltage regulation by zero power factor method or potier method. The following are the three methods which are used to predetermine the voltage regulation of smooth cylindrical type alternators synchronous impedance emf method ampereturn mmf method potier zpf method 26. Actual load need not be connected to the alternator and hence method can be used for very high capacity alternators. Voltage regulation of an alternator by emf and mmf methods. Regulation of 3phase alternator by zpf and asa methods.
Regulations on 3phase salient pole alternator by slip test. Automatic voltage regulation of alternator used in ukai pp page link. Also, what do you mean by pre determining voltage regulation. Feb 18, 2017 if you like my content subscribe for more weekly content as it will not disappoint you lecture by rizwan faraday sir. To determine the regulation of the alternator by this method occ, scc and zpf test details and characteristics are required. Mmf method of voltage regulation mmf method is also known as ampere turn method. Regulation of 3phase alternator by emf and mmf methods.
Zpf test is conducted by connecting the alternator to zpf load and exciting the alternator in such way that the alternator supplies the rated current. Slip test measurement of direct and quadrature axis reactance and predetermination of regulation of salient pole synchronous machines. Mmf method of voltage regulation its phasor diagram. Asa method of voltage regulation pdf the best free software. The potier triangle determines the voltage regulation of the machines.
In the operation of an alternator, the armature resistance drop ir a and armature leakage reactance drop ix l are actually emf quantities while the armature reaction is basically mmf quantity. In this experiment, the emf and mmf methods are used. The main advantages of this method is the value of synchronous impedance z s for any load condition can be calculated. Blondels two reaction theory, phasor diagram, direct axis and quadrature axis synchronous reactances, power angle characteristics, slip test. Cs3361 alternator voltage regulator fet driver the cs3361 integral alternator regulator integrated circuit provides the voltage regulation for automotive, 3. Mar 28, 2015 during the operation of the alternator, resistance voltage drop iara and armature leakage reactance drop iaxl are actually emf quantities and the armature reaction reactance is a mmf quantity. The voltage regulation of an alternator is defined as the rise in voltage when fullload is removed. The graph of the potier triangle is shown in the figure below. If you like my content subscribe for more weekly content as it will not disappoint you lecture by rizwan faraday sir. Dec 07, 2019 the voltage regulation of an alternator is defined as the change in its terminal voltage when the full load is removed, keeping field excitation and speed constant, divided by the rated terminal voltage. Performance of synchronous generator connected to infinite bus, under constant power. Mmf method is used for determining the voltage regulation of an alternator or synchronous generator is also called ampere turns method or rotherts mmf method. It drives an external logic level n channel enhancement power fet for control of the alternator field current. So if v ph rated terminal voltage eph no loadinduced e.
Load regulation percent 100 x voltage no load voltage full load divided by voltage full load. Voltage regulation of an alternator is defined as the change in terminal. The magnitude of this change depends not only on the load but also on the load power factor. Voltage regulation of alternator by mmfampere turn method. How to find voltage regulation of alternator by zpf method and solved problems potier triangle method regulation of synchronous. Jun 11, 2015 voltage regulation of synchronous generator by mmf method. Potier triangle or zero power factor method circuit globe. Methods of finding voltage regulation in synchronous generator. Methods to determine voltage regulation of alternator. It might help if you describe what this method is that you are talking about. Regulation of 3phase alternator by zpf and asa methods 9. Voltage regulation of alternator by zpf method and solved. Inspite of these short comings, due to the simplicity of constructions the asa modified from of m. Stardelta starting of a three phase induction motor 10.
No load and blocked rotor test on 3phase induction motor. 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. The rheostat r 3 is brought to its initial position cutin and tpst s 2 is closed. The voltage regulation of all alternator is defined as the rise in voltage when full load is removed field excitation and speed remaining the same divided by the rated terminal voltage. Nov 22, 2015 voltage regulation of alternator and solved example. Line regulation is another measure of voltage regulation. Short questions and answers ee1251 electrical machines ii. Factors affecting alternator size alternator on load synchronous reactance vector diagrams of loaded alternator voltage regulation rotherts m. The individual harmonic voltage distortion levels can be established by performing this calculation for the p. Mmf method for determining voltage regulation of alternator. Steps for calculating voltage regulation of synchronous by zero power factor method or potier method using potier reactance. To start induction motor by rotor resistance starter 8. This method depends on the separation of the leakage reactance of armature and their effects.
The synchronous impedance method is based on the concept of replacing the effect of armature reaction by an imaginary reactance the magnetomotive force mmf. Voltage regulation of synchronous generator by mmf method. Which of the method more accurate for determine the voltage. This mmf method is based on the results of open circuit test and short circuit test on an alternator.
Hence regulation of the alternator at any load condition and load power factor can be determined. Apr 20, 2016 normally for voltage regulation calculation, we use methods like. Synchronous impedance method armature turn or mmf method zero pf or potier method synchronous impedance method gives result which is higher than the original value. Zero power factorzpf or potier triangle method for. Jun 04, 2015 voltage regulation it is clear that with change in load, there is a change in terminal voltage of an alternator. Automatic voltage regulation of alternator used in ukai pp posted by.
1129 426 707 682 29 1173 164 1172 817 901 360 373 1088 270 90 1428 684 526 687 541 626 552 867 558 737 475 337 191 233 1030 238 1313 574 1192 771 1365 922 563 459 706 496 1184 435 1399 798 1351 1188