Two reaction theory of salient pole synchronous alternator free download as pdf file. The theory proposes to resolve the given armature mmfs into two mutually perpendicular components, with one located along the axis of the rotor of the salient pole. Full text of maurice blondel, s philosophy of action see other formats. Jul 12, 20 blondels two reaction theory theory of salient pole machine. A stator inside the watthour meter is made up of one current coil and one voltage coil. Dec 06, 2017 what is salient pole alternator theory of andrew blondel. In blondels two reaction theory, if i a is armature current per phase, r a is armature resistance, x d is direct axis synchronous reactance, x q is quadrature axis synchronous reactance and v is the terminal voltage, then the voltage in phase with direct axis will be. His investigations led to the publication in french of empirical theory of synchronous generator in 1899, introducing the two reaction theory capolino, 2004. Sep 20, 2015 blondels two reaction theory theory of salient pole machine. Parallel operation of alternators necessity of parallel operation of alternators, methods of synchronisation dark lamp method and bright lamp. Due to this, the mmfs of armature and field act upon the same magnetic circuit all the time hence can be added vectorially. Voltage in phase with direct axis blondels two reaction theory.
We use your linkedin profile and activity data to personalize ads and to show you more relevant ads. Two reaction theory salient pole synchronous machine circuit. Professor andre blondel has put forward the two reaction theory. Electrical machines ii two marks questions with answers 2014. Blondels two reaction theory, phasor diagram, direct axis and quadrature axis synchronous reactances, power angle characteristics, slip test. Synchronous machines i an extension of blondels tworeaction. Blondels two reaction theory salient pole machine theory. Explain blondels two reaction theory for salient pole synchronous machine. Pdf two reaction theory of synchronous machines generalized. Owing to the di erence in magnetic paths, armature current can be resolved into two components, i d and i q i d. In case of salient pole machines the air gap is not uniform in length around the inner periphery of the armature.
E o i q along e o armature reactance has two components direct axis armature reactancex ad associated with i d quadrature axis armature reactancex aq. Pdf a new equivalent circuit of a salientpole synchronous. Two reaction model of salient pole machines, phasor. Blondel, maurice internet encyclopedia of philosophy. Alternatorslecture 6slip test,two reaction theory youtube. The theory proposes to resolve the given armature mmfs into two mutually perpendicular components. Sep 03, 2016 ac machines two reaction model of salient pole machines, phasor diagram of salient pole machines. Salient pole alternators and blondels two reaction theory brainkart. Blondels theorem and how it relates to metering learn metering. Mar 12, 2017 36 in blondels two reaction theory, if ia is armature current per phase, ra is armature resistance, xd is direct axis synchronous reactance, xq is quadrature axis synchronous reactance and v is the terminal voltage, then the voltage in phase with direct axis will be. Apr 20, 2012 persentation on slip test onsalient pole synchronous machine. The contribution also includes a direct comparison between the space phasor theory on the one hand and the space vector theory and the generalized machine theory on the other in order to make clear where the essential differences between these theories lie.
Two reaction theory of salient pole synchronous alternator scribd. This is the third part of a series of papers on the subject of synchronous machines. This two reaction theory was given by professor andre blondel so it is named as blondel two reaction theory. Parallel operation of alternators necessity of parallel operation of alternators, methods of synchronisation dark. Neglecting saturation, their different effects are considered by assigning to each an appropriate value of armaturereaction reactance, respectively x a d and x a q. Pdf this paper examines a shortcoming of the classical phasor diagram of a salientpole. Neglecting saturation, their different effects are considered by assigning to each an appropriate value of armaturereaction reactance, respectively xad and xaq. Mannan page 1 of 11 alternators two reaction analyses 2, ch. Jun 14, 2015 blondels tworeaction theory considers the effects of the quadrature and directaxis components of the armature reaction separately. Salient pole alternators and blondels two reaction theory. Tworeaction theory of synchronous machines, part i. Blondels two reaction theory theory of salient pole machine. Using two reaction theory of salient pole synchronous.
It is minimum along the polar axis and maximum along the inter polar axis. Mar 28, 2015 blondels tworeaction theory considers the effects of the quadrature and directaxis components of the armature reaction separately. Principle of operation, self starting methods, phasor diagram, load angle. Two reaction theory of synchronous machines generalized method of analysis part i. Among many other important authors in the 20th century, blondel is responsible for the new theology, that played such a great role in the deliberations and arguments of the second vatican co. I and iian extension of blondels tworeaction theory, iiitorqueangle characteristics under transient conditions, ivsinglephase shortcircuits, vthreephase shortcircuits. This paper examines a shortcoming of the classical phasor diagram of a salientpole synchronous machine based on the wellestablished two reaction theory. I of the work of blondel, dreyfus, and doherty land nickle.
Full text of maurice blondel,s philosophy of action. Nicklesynchronous machines, i an extension of blondels two reaction theory. Neglecting saturation, their different effects are considered by assigning to each an appropriate value of armature reaction. Blondels theorem, named after its discoverer, french electrical engineer andre blondel, is the result of his attempt to simplify both the measurement of electrical energy and the validation of such measurements. In nonsalient rotor alternators, air gap length is constant and reactance is also constant. Blondels two reaction theory which gives the method of analysis of disturbing effects caused by a. It is known as the direct axis or d axis component. Blondels two reaction theory theory of salient pole. The reluctances of the magnetic circuits on which m.
Tworeaction theory of synchronous machines generalized. So for example, to meter a single phase twowire service accurately according to blondels theorem we would need a watthour meter with one stator because we have two wires. It is known that in case of nonsalient pole type alternators the air gap is uniform. Explain how the direct and quadrature axis synchronous reactances are. They introduced new definitions of armature leakage reactance and armature reaction reactance which have been adopted and are in present use. Maurice blondel 18611949 blondels importance has largely been in theological and catholic philosophical circles in france, germany, spain, italy, and quebec. Synchronous machine an overview sciencedirect topics. Jun 15, 2015 the blondel s two reaction theory hence considers the results of the cross and direct reaction components separately and if saturation is neglected, accounts for their different effects by assigning to each an appropriate value for armature reaction reactive respectively x aq and x ad. The theorem provides the basis for correctly metering power in polyphase circuits. Two reaction theory salient pole synchronous machine two reaction theory was proposed by andre blondel. Components acting along the pole axis called direct axis 2. Electrical machines expected mcq pdf 7 for coal india limited. Blondels two reaction theory considers the effects of the quadrature and directaxis components of the armature reaction separately. Blondel treated salient pole machines by resolving the fundamental space.
Synchronous machines i an extension of blondels tworeaction theory. The vector diagram for a salient pole synchronous generator, connected to the infinite bus, based on wellknown blondels tworeaction theory, is given in figure 2. Blondels two reaction theory two reaction theory proposed by blondel. In case of salient pole machines regulation is found out by applying blondels two. For a salient pole synchronous machine, derive an expression for power developed as a function of load angle. The advantages of the matrixtransformation theory and the laplace transform method are demonstrated.
Synchronous machines notes part2 electric equipment. Hence the armature flux and field flux cannot vary sinusoidally in the air gap. Appraisal of the application of the tworeaction theory to unsaturated. Due to uniform air gap, the field flux as well as armature flux very sinusoidally in the air gap. Two reaction theory of salient pole synchronous alternator. Theory of salient pole machine blondels two reaction theory direct axis and quadrature axis synchronous reactances phasor diagram and determination of xd and xq by slip test.
In salient pole type alternators the length of the air gap varies and the reluctance also varies. Blondels two reaction theory salient pole machine theory mcqs with answers q1. Theory of salient pole machine blondels two reaction theory direct axis and quadrature axis synchronous reactances phasor diagram and determination of x d and x q by slip test. Blondel two reaction theory salient pole alternators theory. The revised tworeaction theory is illustrated using the mathematical model of a. Name enrolment number roll number chanchal jain slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. It is shown that park s transformation is equivalent to a change from a synchronous machine to a d.
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