Electrical

High Frequency Transformers In this category we study (1) Audio frequency (AF) transformer (2) Intermediate frequency (IF) transformer. (1) Audio Frequency (AF) Transformer Audio frequency range is 20 Hz to 20 kHz These transformers are especially designed for connecting different telephone systems to each other keeping their respective power supplies ‘isolated’. Following are the functions … Read more

Comparison (similarity/difference) between Two Winding Transformer and Autotransformer Sr. No. Point of comparison Two winding Transformer Auto Transformer 1 Two types Step down and step up Similar types 2 Cost More Less 3 Construction Core and two winding Core and only one winding 4 Weight of copper Wc (1 – k) Wc  which is < … Read more

Core Cross Section For small core type transformers simple rectangular section limbs with rectangular coils are used. However for large capacity transformers circular coils are used instead of rectangular coils, as a circle gives reduced length of mean turn (due to minimum perimeter for a particular area) which reduces requirement of conductor material, which in … Read more

Transformer Core Q. Explain core, core cross section, yoke cross section of transformer. Core of the transformer is the main magnetic circuit and it offers low reluctance path for the flux. Special attention is given to core as it controls important operating characteristics such as no load current, losses, efficiency etc. hence high resistance and … Read more

Shell Type Transformer Q. Explain working of shell type transformer. In this type of transformer core covers the larger portion of windings. As shown in Figure windings are wound on central portion of the limb, which carries total flux while the side limbs completes the flux path and carry half. In this high voltage and … Read more

Core Type Transformer Q. Explain core type transformer. Core type transformer In this type of transformer winding covers the large portion of core. Windings (LV and HV) are wound on the limb of the core which is made up of laminations. Fig. 1.2.1 shows the construction of core type transformer. The laminations which connects two … Read more

Types of Autotransfomer Q. What are the two different types of Autotransformer?       Type No.1 : Step down Autotransformer       Type No.2 : Step up Autotransformer Generally stepdown type is universally used to get a variable voltage from a supply (primary) Relations of Primary / Secondary Voltage, Currents and Transformation Rations … Read more