Determination of the number of turns of the transformer windings. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies
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Determination of the number of turns of the windings of the transformer, if its type and parameters are not known, is carried out as follows.
Using an ohmmeter, determine the location of the terminals of all the windings of the transformer. Since the filament winding of the power transformer and the secondary winding of the output transformer have a small number of turns of a relatively thick wire, these windings can be distinguished from the mains (secondary) winding either by external examination - by the largest diameter of the terminals, if the terminals are made with a winding wire, or by the least resistance, if It is impossible to determine the winding by the diameter of the wire.
If there are gaps between the coil and the matitovod, an additional winding is wound on the coil over the windings (possibly with a thin wire), and the more turns, the more accurate the measurement results will be.
One of the secondary windings is taken as primary and a small (not higher than 5 ... 7 V) alternating voltage is applied to it.
By measuring the voltage on each winding of the transformer, including the additional one, the number of turns of any winding is determined by the formula:
where Ui is the voltage on the i-winding; Udon - voltage on the additional winding; (ωadm - the number of turns of the additional winding.
If there is no room for an additional winding on the transformer coil, part of the outer winding can be used. To do this, carefully open the outer insulation layer of the coil in order to gain access to the last winding layer, usually made turn by turn. A certain number of turns (ωdop) are counted from the end of the winding. One probe of the voltmeter is connected to the end of the winding, the other probe with a needle, piercing the enamel of the last counted turn, measure the alternating voltage Udon on the part of the windings containing (ωadm) turns. In the role of the primary winding, on which the initial voltage falls, any winding of the transformer, including the external one, can be used.
After measuring the voltage on all windings of the transformer, determine the number of turns in each winding according to the above formula.
Author: V.Gakov, Moscow
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