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Difference between Core Type and Shell Type Transformer

Difference between Core Type and Shell Type Transformer The main difference between Core type and Shell Type Transformer is the constructional difference of their core and winding arrangement. In core type transformer, the magnetic core consists of two limbs and two yokes whereas in Shell type transformer, there are three limbs and two yokes. In core type transformer , the HV (High Voltage) and LV (Low Voltage) winding are wound on both the limbs. The winding are wound in such a manner to minimize the leakage flux. For this purpose, first LV winding is wound over which HV winding is wound. This also have advantage of lesser insulation requirement for having insulation between the LV winding and the core. Figure below shows a simple diagram of core type transformer. Shell Type Transformer: In Shell type transformer, the winding are interleaved or sandwiched on the central limb as shown in figure below. The LV winding is placed near the yoke and its size is made half of that of other win...
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Difference between Step-up and Step-down Transformer

Difference between Step-up and Step-down Transformer The main difference between step-up and step-down transformer is that, step-up transformer increases the voltage whereas a step-down transformer decreases the voltage. The secondary voltage of step-up transformer is more than that of its primary voltage whereas the secondary voltage of step-down transformer is less than its primary voltage. In fact, these two terms, i.e. step-up or step-down has significance from operational point of view. From construction and design point of view, there is no difference between step-up and step-down transformer. A given transformer can be used as step-up or step-down transformer. If the HV (High Voltage) winding is connected to supply main and LV (low voltage) winding to load, the transformer works as Step-down transformer. This is because, the transformer is delivering the power at a decreased voltage at secondary terminal. Figure below shows a step-down transformer. In the above figure, HV windin...
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Conductance: What is it? (Definition, Units & Formula)

Conductance: What is it? (Definition, Units & Formula) What is Conductance? Conductance (also known as electrical conductance ) is defined as the potential for a substance to conduct electricity Conductance is the measure of how easily electrical current (i.e. flow of charge) can pass through a material. Conductance is the inverse (or reciprocal) of electrical resistance, represented as 1/R. To have a better understanding of conductance, one must recall the resistance of an object. In a qualitative sense, the resistance tells us how difficult it is for an electrical current to pass. The resistance between two points can be defined in the quantitative sense as the difference in voltage that is needed to carry a unit current across the two specified points. The resistance of an object is represented as the ratio of the voltage across something to the current passing through it. The resistance is measured in Ohms. The conductance of a component is a determination of how quickly c...
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Synchronous And Asynchronous Motors – Where To Use Them?

The following information deals with the general working principles of Synchronous and Asynchronous motors, their advantages and where are they normally used and what can be achieved using each of these motors. Synchronous and Asynchronous Motors – Working Principles Synchronous Motors This is a typical AC electrical motor that is capable of producing synchronous speeds. In these motors, both the stator and the rotor rotate at the same speed thus achieving synchronization. The basic working principle is, when the motor is connected to the mains, electricity flows into the stator windings, producing a rotating electromagnetic field. This is in turn induced on to the windings in the rotor which then starts rotating. An external D.C source is required to lock the rotor’s rotating direction and position with that of the stator. As a result of this interlocking, the motor has either to run synchronously or not run at all. Asynchronous Motors The working principle of asy...
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Star Delta Starter

Star Delta Starter: Circuit Diagram, Working Principle & Theory What is Star Delta Starter A   star delta starter   is the most commonly used method for the starting of a   3 phase induction motor . In star delta starting an   induction motor   is connected in through a   star connection   throughout the starting period. Then once the motor reaches the required speed, the motor is connected in through a   delta connection.  A star delta starter will start a motor with a star connected stator winding. When motor reaches about 80% of its full load speed, it will begin to run in a delta connected stator winding.     A s tar delta starter is a type of reduced voltage starter. We use it to reduce the starting current of the motor without using any external device or apparatus. This is a big advantage of a star delta starter, as it typically has around 1/3 of the inrush current compared to a DOL starter .     T...
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