Regulation of alternator by synchronous impedance method pdf

Regulation of alternator by synchronous impedance method pdf
Voltage Regulation of Synchronous Machine (Alternator) by E.M.F Method or Synchronous Impedance Method. Posted by Electrical Edition. Alternator. Voltage regulation of synchronous machine by EMF method or synchronous impedance method. In this post we are going to learn how to calculate voltage regulation of synchronous machine by EMF method or synchronous impedance method…
12/07/2013 · The main advantages of this method is the value of synchronous impedance Z s for any load condition can be calculated. Hence regulation of the alternator at any load condition and load power factor can be determined. Actual load need not be connected to the alternator and hence method can be used for very high capacity alternators.
1.1 INTRODUCTION TO EXCITATION SYSTEM The basic function of an excitation system is to provide necessary direct current to the field winding of the synchronous generator.
synchronous reactance, synchronous impedance, experimental determination -phasor diagram of a loaded alternator. Voltage regulation -EMF, MMF, ZPF and ASA methods – numerical problems. 11 III Theory of salient pole machine -Blondel’s two reaction theory -direct axis and quadrature axis synchronous reactances – phasor diagram and determination of Xd and Xq by slip test. Parallel …
From the above figure consider the field current If = OA that produces rated alternator voltage per phase.html 6/11 .C and S. the synchronous impedance ZS is constant.C.C. Assumptions in the Synchronous Impedance Method The following assumptions made in the synchronous Impedance Method are given below.
Synchronous Impedance or E.M.F. Method for finding a Voltage Regulation. The Synchronous Impedance Method or Emf Method is based on the concept of replacing the effect of armature reaction by an imaginary reactance.
UNIT-IV Voltage Regulation of Alternators 31-39 UNIT-V Parallel Operation of Alternator 40-47 UNIT – polyphase induction motor with negligible leakage impedance as shown by the dashed curves f and b in Fig. 1.2. The resultant torque-speed characteristic which is the algebraic sum of the two component curves shows that if the motor were started by auxiliary means it would produce torque

SYNCHRONOUS GENERATOR QUESTION AND ANSWER

Alternator Synchronous Generator Definition and Types of
Synchronous impedance method gives result which is higher than the original value. That’s why it’s called the ‘pessimistic method’. Armature turn or mmf method gives value which is lower than the original value. That’s why it’s called the ‘optimistic method’. Hence, the most accurate method of
The synchronous impedance model of the synchronous machine is based on the linearity assumption and will hold for the unsaturated region of machine operation …
Energise the alternator with field unexcited and driven close to synchronous speed by a prime mover. 2. Measure the line voltage and line current of the alternator. 3. Find Xd and Xq by the following expressions Xd =
Synchronous machines can also be used as motors, but they are usually built in very large sizes. The synchronous motor operates at a precise synchronous speed, and hence is a constant-speed motor. Unlike the induction motor, whose operation always involves a lagging power factor, the synchronous motor possesses a variable-power-factor characteristic, and hence is suitable for power-factor
REGULATION OF A THREE PHASE ALTERNATOR (By Synchronous Impedance and MMF Method) Aim: – To determine the regulation of a 3-phase alternator by
The synchronous impedance ZS , found is always more than its value under normal voltage conditions and saturation. Hence, the value or regulation so obtained is always more, than that found from an actual test. That is why it is called pessimistic method.
Electrical Machines-II. Experiment No. 2 Experiment No. 2 1.0 Title:To Determine voltage regulation of three-phase Alternator by Synchronous Impedance method.

Please ASK FOR regulation of alternator by synchronous impedance method BY. REGULATION OF 3 PHASE ALTERNATOR BY EMF AND MMF METHOD EMF METHOD. REGULATION OF 3 PHASE ALTERNATOR BY ZPF AND ASA METHOD.
EMF method: This method is also known as synchronous impedance method.Here the magnetic circuit is assumed to be unsaturated. In this method the MMFs (fluxes) produced by rotor and stator are replaced by their equivalent emf, and hence called emf method.To predetermine the regulation by this method the following information is to be determined.Armature resistance/phase of the alternator, …
Determine the value of Isc and field current that gives the rated alternator voltage per phase. the synchronous impedance Zs will then be equal to the open circuit voltage divided by the short circuit current at the field current which gives the rated e.m.f. per phase.

In this method Zs synchronous impendce is directly proportional to No load induce emf Eo ie.. Zs=(Voc/Isc) At same filed current From oc test we have Voc From sc test we have Is * Therefore Xs^2=(Zs^2-Ra^2) * From above pic Zs(unsaturated)>Zs(satu…
It is conducting OC and SC tests on the given three phase alternator and determining the regulation by synchronous impedance method.
What is Regulation of alternator by synchronous impedance method? Find answers now! No. 1 Questions & Answers Place.
to find the percentage regulation of 3-phase alternator by synchronous impedance method at various power factor and load vector diagram of how regulation of alternator is affected by power factor what are assumptions during slip test
The measurement of synchronous impedance IDEALS
Ans: The voltage regulation of an alternator is defined as the change involtage Ans: (i) Synchronous impedance method/EMF Method (ii) Ampere turn method / MMF method (iii) ASA Method (iv) ZPF/ Potier triangle Method 19. Why the EMF method of estimating voltage regulation is also called pessimistic method? Ans: The value of voltage regulation estimated by EMF method is …
An alternator is such a machine which converts mechanical energy from a prime mover to AC electric power at specific voltage and frequency. It is also known as synchronous generator.
ZPF method takes into consideration the armature resistance and leakage reactance voltage drops as EMF quantities and the effect of armature reaction as MMF quantity.This is the reality hence the results obtained by this method are nearer to the reality the those obtained by synchronous impedance method and ampere-turns method.The only drawback of ZPF method is that the separate curve for
Page 1 MAHARASHTRA STATE BOARD OF TECHNICAL EDUCATION ? 7 Electrical Machines-II Experiment No. 2 Experiment No. 2 1.0 Title:- To Determine voltage regulation of three-phase Alternator by Synchronous Impedance method. 2.0 Prior Concepts:- – Working principle and construction of Alternator.
A no load voltage is induced in the stator coils of alternator when rotor is rotated by a prime mover. When a balanced load is connected across stator winding a balanced set of 3 phase currents flow with a phase relation with no load voltage depending on nature of load.
Write different methods for determining the voltage regulation of synchronous generator. Define regulation of Alternator. What are the components of synchronous impedance?
EE8401 Question Paper ELECTRICAL MACHINES 2. EE8401 Question Paper Electrical Machines 2 Regulation 2017 Anna University free download. Electrical Machines 2 Question Paper EE8401 pdf …
8/05/2018 · Voltage Regulation of Alternator by EMF Method and SOLVED PROBLEMS synchronous impedance method regulation of synchronous generator EMF Method Voltage Regulation of Alternator by EMF Method
ELECTRICAL MACHINES LAB II. 2 S.NO Name of Experiment Page NO 1 To pre determine the regulation of an alternator at full load at different power factors using synchronous impedance and MMF methods. 5 To pre determine the regulation of an alternator at full load at different power factors using 6 V and inverted V curves of a 3-phase synchronous motor. 7 To determine positive sequence – navigation principles of positioning and guidance pdf Regulation of a three phase alternator by synchronous impedance & m.m.f methods 8. V and inverted V curves of a three phase synchronous motor 9. Equivalent circuit of a single phase induction motor 10. Determination of Xd and Xq of a Salient pole synchronous machine Additional Experments 1. Parallel Operation of Two Single Phase Transformers. 2. Measurement of sequence Impedance of a …
Contents Defination Methods to determine voltage regulation 1) Synchronous Impedance method 2) MMF Method 3) Zero Power Factor Method 3. • A convenient way to compare the voltage behaviour of two generators is by their voltage regulation (VR).
regulation of non-salient pole alternators. In emf method, the effect of armature reaction is represented as a In emf method, the effect of armature reaction is represented as a fictitious reactance X
LEROY SOMER SERVICE AND OPERATING MANUAL 2327 en – 11.2011 / o ALTERNATORS 8 1.2 GENERAL DESCRIPTION 1.2.1 Generator The synchronous generator is an alternating-current
Regulation of Alternator – Free download as Word Doc (.doc / .docx), PDF File (.pdf), Text File (.txt) or read online for free. Scribd es red social de lectura y publicación más importante del mundo.
8 Authorsanddesignersarequiteunanimousin assumingsynchronousimpedancetobeaconstantquantity, orverynearlyso,andalmostallpredeterminationsof
Synchronous Generators Dr. Suad Ibrahim Shahl 1 II. Synchronous Generators Synchronous machines. are principally used as Ventilation or Cooling of an Alternator • The slow speed salient pole alternators are ventilated by the fan action of the salient poles which provide circulating air. • Cylindrical rotor alternators are usually long, and the problem of air f low requires very special
Important..!About regulation of an alternator by emf mmf and zpf method is Not Asked Yet ? .. Please ASK FOR regulation of an alternator by emf mmf and zpf method BY CLICK HERE….Our Team/forum members are ready to help you in free of cost…
Why is the synchronous impedance method of estimating voltage regulation considered as pessimistic method? Compared to other methods, the value of voltage regulation obtained by the synchronous impedance method is always higher than the actual valuei.e actual value is lower than the results obtained and therefore this method is called the pessimistic method.
The voltage-regulation of a synchronous generator is the voltage rise at the terminals when a given load is thrown off, the excitation and speed remaining constant. The voltage-
The regulation of an alternator can be determined by various methods. In case of small capacity alternators it can be determined by direct loading test while for large capacity alternators it can be determined by synchronous impedance method.
MEASUREMENT OF SYNCHRONOUS IMPEDANCE BY THE SHORT CIRCUIT METHOD. The usual method of measuring synchronous impedance is by the short circuit test, which consists in running the alter- nator at normal speed with its armature short circuited thru an ammeter- and leads of negligible resistance and inductance. The field is excited to give various armature currents. The open circuit, …
Electrical Machines-III Important Questions Pdf file – EM
The synchronous impedance of an alternator can be determined using the open-circuit and short-circuit characteristics of the alternator shown in Figure (a). For a given field current, say OS 1 , the corresponding no-load voltage is Q 1 S 1 , and the corresponding armature current is R 1 S 1 .
11/01/2015 · Synchronous Impedance of a Wye-Connected Alternator The voltage regulation of a three-phase alternator can also be determined using the synchronous impedance method. Figure 12–24 shows the circuit used to determine the synchronous impedance of a …
In this way we have calculated the voltage regulation of synchronous machine by direct load test method. For larger capacity machines voltage regulation can be calculated by Indirect method. In the next post we can see how to calculate voltage regulation of synchronous machine by Indirect method.
Synchronous impedance Then, Synchronous reactance, Fig – 5 shows the phasor diagram of the alternator, supplying full load current of I a ampere, lagging the terminal voltage V by an angle . The open circuit voltage E 0 of the alternator is given by, Phosor sum The diagram has been drawn with the current as the reference phasor and is self explanatory.
The main advantages of this method is the value of synchronous impedance Z s for any load condition can be calculated. Hence regulation of the alternator at any load condition and load power factor can be determined. Actual load need not be connected to the alternator and hence method can be used for very high capacity alternators.
22/11/2015 · How does electron move around nucleus? Gryzinski’s free-fall atomic models for chemical elements – Duration: 6:25. Barthek88 231,704 views
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EE8401 Question Paper ELECTRICAL MACHINES 2. EE8401 Question Paper Electrical Machines 2 Regulation 2017 Anna University free download. Electrical Machines 2 Question Paper EE8401 pdf …
An alternator is such a machine which converts mechanical energy from a prime mover to AC electric power at specific voltage and frequency. It is also known as synchronous generator.
LEROY SOMER SERVICE AND OPERATING MANUAL 2327 en – 11.2011 / o ALTERNATORS 8 1.2 GENERAL DESCRIPTION 1.2.1 Generator The synchronous generator is an alternating-current
UNIT-IV Voltage Regulation of Alternators 31-39 UNIT-V Parallel Operation of Alternator 40-47 UNIT – polyphase induction motor with negligible leakage impedance as shown by the dashed curves f and b in Fig. 1.2. The resultant torque-speed characteristic which is the algebraic sum of the two component curves shows that if the motor were started by auxiliary means it would produce torque
A no load voltage is induced in the stator coils of alternator when rotor is rotated by a prime mover. When a balanced load is connected across stator winding a balanced set of 3 phase currents flow with a phase relation with no load voltage depending on nature of load.
Page 1 MAHARASHTRA STATE BOARD OF TECHNICAL EDUCATION ? 7 Electrical Machines-II Experiment No. 2 Experiment No. 2 1.0 Title:- To Determine voltage regulation of three-phase Alternator by Synchronous Impedance method. 2.0 Prior Concepts:- – Working principle and construction of Alternator.
22/11/2015 · How does electron move around nucleus? Gryzinski’s free-fall atomic models for chemical elements – Duration: 6:25. Barthek88 231,704 views
synchronous reactance, synchronous impedance, experimental determination -phasor diagram of a loaded alternator. Voltage regulation -EMF, MMF, ZPF and ASA methods – numerical problems. 11 III Theory of salient pole machine -Blondel’s two reaction theory -direct axis and quadrature axis synchronous reactances – phasor diagram and determination of Xd and Xq by slip test. Parallel …
Regulation of Alternator – Free download as Word Doc (.doc / .docx), PDF File (.pdf), Text File (.txt) or read online for free. Scribd es red social de lectura y publicación más importante del mundo.
8/05/2018 · Voltage Regulation of Alternator by EMF Method and SOLVED PROBLEMS synchronous impedance method regulation of synchronous generator EMF Method Voltage Regulation of Alternator by EMF Method
Energise the alternator with field unexcited and driven close to synchronous speed by a prime mover. 2. Measure the line voltage and line current of the alternator. 3. Find Xd and Xq by the following expressions Xd =
Why is the synchronous impedance method of estimating voltage regulation considered as pessimistic method? Compared to other methods, the value of voltage regulation obtained by the synchronous impedance method is always higher than the actual valuei.e actual value is lower than the results obtained and therefore this method is called the pessimistic method.
Write different methods for determining the voltage regulation of synchronous generator. Define regulation of Alternator. What are the components of synchronous impedance?