Determination of the number of turns of the windings of a power transformer. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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When the type of transformer is not known or data is not available, the number of turns of each winding can be determined using an avometer. Using an ohmmeter, determine the location of the terminals of all the windings of the transformer. If there are gaps between the coil and the magnetic circuit, an additional winding is wound with a thin wire over the windings. The more turns the winding has, the more accurate the measurement results will be.
If there is no space on the transformer coil for an additional winding, then a part of the outer winding can be used instead of an additional winding. To do this, carefully open the outer insulation layer of the coil in order to gain access to the last winding layer, made, as usual, turn to turn. A certain number of turns are counted from the end of this winding in the "naked" layer. Carefully peel off the enamel of the last counted turn.
When measuring, one probe of the voltmeter is connected to the end of the winding, a needle is clamped into the other probe. An ohmmeter measures the resistance of all windings, the winding with high resistance is primary. In the case when there are still windings with high resistance, one of the windings with low resistance is taken as the primary one and a low alternating voltage is applied to it, for example, 6 V from any power transformer. Apply voltage to the primary winding and measure the voltage on all windings. If a low resistance winding was used as the primary winding, then the primary winding of the transformer is determined.
After applying mains voltage to it, the voltage is measured again on all windings. Using the voltage measurement data on each winding, the number of turns is determined by the formula:
Wp=UpWadd/Uadd,
where Wp is the number of turns of any winding; Up - voltage on this winding; Udop - voltage on the additional winding; Wadd - the number of turns of the additional winding.
Author: V.F. Yakovlev
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