By J. G. Horner
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Extra resources for Dictionary of terms used in the theory and practice of mechanical engineering
Its function is to lower the voltage levels for distribution 1st level purposes. iii) Distribution Transformers – located at small distribution substation. It lowers the voltage levels for 2nd level distribution purposes. g. Potential Transformer (PT) , Current Transformer (CT) 2 EEEB344 Electromechanical Devices Chapter 2 2. The Ideal Transformer 1. Definition – a lossless device with an input winding and an output winding. 2. Figures below show an ideal transformer and schematic symbols of a transformer.
L = vBl sin θcd out of the page 4. Segment da same as segment bc, v x B is perpendicular to l. Thus, eda = 0 Total induced voltage on the loop eind = eba + ecb + edc + ead = vBl sin θab + vBl sin θcd = 2 vBL sinθ since θab = 180º - θcd and sin θ = sin (180º - θ ) Alternative way to express eind: If the loop is rotating at a constant angular velocity ω, then the angle θ of the loop will increase linearly with time. θ = ωt also, the tangential velocity v of the edges of the loop is: v= r ω where r is the radius from axis of rotation out to the edge of the loop and ω is the angular velocity of the loop.
In the figure above, the net magnetomotive force is Fnet = NPiP - NSiS This net magnetomotive force must produce the net flux in the core, so Fnet = NPiP - NSiS = φ R Where R is the reluctance of the core. The relationship between primary and secondary current is approx Fnet = NPiP - NSiS ≈ 0 as long as the core is unsaturated. Thus, NPiP ≈ NSiS iP N S 1 = = iS N P a In order for the magnetomotive force to be nearly zero, current must flow into one dotted end and out of the other dotted end. As a conclusion, the major differences between an ideal and real transformer are as follows: a) An ideal transformer’s core does not have any hysteresis and eddy current losses.
Dictionary of terms used in the theory and practice of mechanical engineering by J. G. Horner