The choice of wire for the transformer according to the current in the load. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Electrician's Handbook
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At home, a power step-down transformer is often required to power the assembled structure. When it is not possible to find a suitable one in terms of parameters among the unified standard ones, it has to be made independently. Depending on the type of magnetic circuit used and its power, one of the values of the current density J in wires 2 is usually taken; 2,5 or 3 A/mm sq.
The cross section (Spp) and diameter (d) of the wire are determined from the ratios:
To wind a transformer, it is often necessary to use copper winding wires of the PEV-1, PEV-2 and PETV brands with enamel insulation. Industry according to GOST 7262-78 produces a large list of wire diameters. Of these, the most commonly used sizes are shown in Table. 6.6 Using this table, you can immediately select the desired wire according to the known current through the winding. The table is calculated for three fixed values of current load (current density): 2, 2,5 and 3 A/mmXNUMX.
Table 6.6. Permissible current for winding wires
Author: Shelestov I.P.
See other articles Section Electrician's Handbook.
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