![]() Then we proceed to calculate as follows:. N2a = Secondary current (Is) calculated / (current density/200)įor these values of primary and secondary currents we choose the corresponding SWG and Turns per sqcm from the wire table. N1a = Primary current (Ip) calculated / (current density/200) So depending on the current densities choosen we now calculate the values of primary and secondary currents that are to searched in wire table for selecting SWG:. It is opted as, the temperature rise for the intermittent operational cases are less for the continuous operational cases. For non-continuous or intermittent mode of operation of transformer one can choose a higher density up to 400A/cm² i.e., twice the normal density to economize the unit cost. The above mentioned wire table is for a continuous rating at current density of 200A/cm². It is the current carrying capacity of a wire per unit cross sectional area. The width of the tongue of laminations is approximately given by:.Secondary turns (n2) = Turns per volt(Tpv) * secondary voltage(V2) * 1.03 (Assume that there is 3% drop in transformer windings). ![]() Primary turns (n1) = Turns per volt(Tpv) * Primary voltage(V1).for ordinary Steel stampings and 1.3Wb/sq cm for CRGO stampings, depending on the type to be used. Dimension of Transformer stampings (Core table):įor operation on mains supply, the frequency is 50HZ, while the flux density can be taken as 1Wb/sq cm.
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