Device for determining interturn short circuits. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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A simple attachment to the avometer, the circuit of which is shown in the figure, makes it possible to detect interturn short circuits of up to three or four turns in transformers, chokes and other parts with windings.
The prefix is a low-frequency generator, assembled according to a three-point scheme, with capacitive feedback through capacitors C1 and C2. The role of the inductance of the generator circuit is played by the tested coil. The potentiometer R4 serves to maintain a constant current flowing through the transistor T1, when the internal resistance of the battery supplying the generator changes. Plugs of the avometer probes are inserted into the sockets Gn1 and Gn2. The probe tips are connected to the terminals of the part to be tested. Socket Gn1 is also a power switch. To do this, it is cut along the entire length. The socket halves are closed with a plug inserted into it, the power is turned on. Single-pole plugs, indicated by arrows at the bottom of the diagram, are included in the avometer sockets for measuring alternating voltage.
The operation of the device is based on a decrease in the amplitude of the generated voltage when connecting a part with an interturn circuit, since in this case the quality factor of the circuit is significantly reduced. A decrease in voltage is noted by an avometer connected to the device.
The calibration of the assembled device is carried out as follows. Prepare the device for measurements by connecting an avometer and probes to it as described above. Then, a serviceable unified row regulator of the PPC-70 type with a core inserted inside the coil is attached to the probes. By adjusting the potentiometer R4, the avometer shows an alternating voltage value of 1,5 V. Then the probes are disconnected from the PPC-70, the device plugs are removed from the sockets of the avometer, and I measure the collector current of the transistor T1 using the last one. The resulting tone value should be further set using the K4 potentiometer before checking any part. Note the voltage fluctuations. which the avometer will show when connecting other serviceable parts, the avometer readings are tabulated and guided by this table during checks.
Author: V. Dmitriev, Rostov-on-Don; Publication: N. Bolshakov, rf.atnn.ru
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