The coefficient of transformation is one of key parameters of any transformer. If this indicator is unknown, it can be defined independently in the experimantalny way.
Instruction
1. Prepare the auxiliary transformer developing on a secondary winding tension about 3 V. Eto there can be, for example, a filament winding of the transformer from any damaged device equipped with the vacuum and luminescent indicator. Do not allow short circuit of this winding at all.
2. On the test transformer by means of an ohmmeter or the device replacing it find a winding with the smallest resistance. Pay at measurements attention to a difference even in ohm shares. It contains the smallest number of rounds. At measurements do not concern current carrying parts to exclude blow by self-induction tension.
3. Give tension to 3 V from the auxiliary transformer on the winding with the smallest number of rounds defined in the way stated above via the safety lock on 0.25 A. At first connect the auxiliary transformer to the examinee, and only then give supply voltage on the auxiliary transformer. Give it also via the safety lock of the same face value. Do not touch elements of primary chain.
4. Parallel to a transformer winding with the smallest number of rounds connect the voltmeter of alternating current. Write down its indications.
5. Begin to connect the same voltmeter to other windings of the transformer. If necessary, switch limits. Remember that high tension can act on other windings. Every time write down indications and also arrangement of conclusions of these windings. Do not allow during measurements even short-term short circuits.
6. Having ended an experiment, cut off power the auxiliary transformer then investigate installation.
7. To define transformation coefficient between any two windings of the transformer, divide tension on one of them into tension on another. If desired, make the table of coefficients of transformation for all combinations of its windings.