You will need
- - screwdriver;
- - hammer;
- - multimeter;
- - winding machine with a counter.
- - winding wire;
- - soldering iron, solder and neutral flux;
- - megger
Instruction
1
Make sure that the transformer is collapsible. If the core is assembled by bonding varnish, or by welding, and if the device is sealed in any way, then rewind it unusable.
2
Some transformers have multiple secondary windings. Connecting them in series, you can get different voltages. If some windings are not used, including them is consistent with already used, it is possible to increase the output voltagewithout resorting to disassembly of the transformer.All perepiski do when the power is off. If we remove the voltage after the alteration has not increased, but decreased, then the additional winding is connected in the wrong phasing. Reverse its findings.
3
Making sure that the transformer has a split design, you can begin disassembly. Removing the mounting core, take it easy blows of a hammer, remembering the location of the plates.Releasing the coil from the core, wrap it in a measuring coil having a few dozen turns. Restrain her, pull out insights, and then assemble the transformer.
4
Connect to the measuring winding of the multimeter to measure AC voltage, take the transformer primary winding rated voltage. Dividing the number of turns of the measuring coil on the measured voltage, you get the number of turns per volt.
5
Calculate the new number of turns of the secondary winding, which must include consistently available, according to the following formula:Ndon=(U2-U1)*(Pizma/Uизм), where:
Ndon - the required number of turns of the auxiliary winding;
U2 is a voltage, which is required;
U1 - the voltage of the existing secondary winding;
The pizma - number of turns of the measuring coil;
The Uизм - voltage taken from the measuring coil.Again disassemble the transformer, coil and measuring coil and instead wrap additional. Use wire of the same cross section as that of the existing secondary winding, at the same time, keep the coil diameter is not increased too much, otherwise the core would be impossible to wear. If you comply with this requirement does not work, from alterations of the transformer have to give.
Ndon - the required number of turns of the auxiliary winding;
U2 is a voltage, which is required;
U1 - the voltage of the existing secondary winding;
The pizma - number of turns of the measuring coil;
The Uизм - voltage taken from the measuring coil.Again disassemble the transformer, coil and measuring coil and instead wrap additional. Use wire of the same cross section as that of the existing secondary winding, at the same time, keep the coil diameter is not increased too much, otherwise the core would be impossible to wear. If you comply with this requirement does not work, from alterations of the transformer have to give.
6
Isolate an additional winding, assemble the transformer, then turn on the new winding in series with the secondary. Ensure correct phasing in the manner described above.
7
After the alteration of the transformer in any case not shoot with his power greater than that to which it was originally designed. To calculate this power is to multiply relieves the stress on the current consumption.
8
With the help of a megger, make sure that the leakage between the primary and secondary windings and between each of them and the core is not even after prolonged heating at rated in output power. Make sure that the test does not appear to be a smell of burning, smoke.
