Mindblown: a blog about philosophy.
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Phasor Diagram of a Synchronous Generator
In this article we discuss one of the easiest methods of making a phasor diagram for a synchronous generator. Now, let us write the various notations for each quantity at one place, this will help us to understand the phasor diagram more clearly. In this phasor diagram we are going to use: Ef which denotes excitation voltage…
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Power Derivation in Synchronous Motors
In order to derive various conditions for power in both alternators and synchronous motors, let us consider the general problem of power flow through inductive impedance. The circuit diagram shown below consists of voltage source E1, voltage source E1 and load which consists of one resistor in series with an inductor. Now if we assume…
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Rating of Alternator
Power rating of an alternator is defined as the power which can be delivered by an alternator safely and efficiently under some specific conditions. Increasing load increases losses in the alternator, which leads to a temperature rise of the machine. The conductor and insulator parts of the machine have some specific overheating withstand limits. The…
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Armature Winding of Alternator
Armature winding in an alternator may be either closed type open type. Closed winding forms star connection in armature winding of alternator.There are some common properties of armature winding. First and most important property of an armature winding is, two sides of any coil should be under two adjacent poles. That means, coil span =…
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Working Principle of Electric Generator
When a conductor moves in a magnetic field, an emf is induced across the conductor. This is the only basis on which each and every rotating electric generator works (such as portable generators). According to Faraday’s law of electromagnetic induction, when a conductor links with a changing flux, it will have an induced emf across…
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Equt. Circuit of Trans. referred to Primary and Secondary
What is the Equivalent Circuit of a Transformer? The equivalent circuit diagram of a transformer is a simplified circuit in which the impedance, resistance and leakage reactance of the transformer can be more easily calculated. The equivalent impedance of transformer is an important parameter to be calculated. This calculation requires the equivalent circuit of transformer…
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Resistance and Leakage Reactance
Leakage Reactance of Transformer All the flux in transformer will not be able to link with both the primary and secondary windings. A small portion of flux will link either winding but not both. This portion of flux is called leakage flux. Due to this leakage flux in transformer, there will be a self-reactance in…
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EMF Equation of Transformer
Emf Equation of Transformer EMF Equation of transformer can be established in a very easy way. Actually in electrical power transformer, one alternating electrical source is applied to the primary winding and due to this, magnetizing current flowing through the primary winding which produces alternating flux in the core of transformer. This flux links with…
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Eddy Current Theory and Applications
What is Eddy Current According to Lenz’s law, a conducting loop when subjected to varying magnetic field gets an emf induced into it causing flow of current in a direction opposing the change causing it. The case goes similar to when instead of a conducting closed loop, the change in magnetic field through a conducting…
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Efficiency of Transformer
Introduction of Efficiency of Transformer Transformers form the most important link between supply systems and load. Transformer’s efficiency directly affects its performance and aging. The transformer’s efficiency, in general, is in the range of 95 – 99 %. For large power transformers with very low losses, the efficiency can be as high as 99.7%. The…
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