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
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