DEVICE FOR MEASURING CURRENT AND OPEN-CIRCUIT LOSS OF POWER TRANSFORMERS AT LOW VOLTAGE Russian patent published in 2006 - IPC G01R31/06 

FIELD: power engineering.

SUBSTANCE: device can be used for testing power transformers during start-setting-up works as well as for complex inspection of power transformers. Device has adjusted ac voltage source provided with control input, commutating body having control input, and multi-vector meter with additional control output. Device also has analog-to-digital unit, energy-independent memory unit, computational unit, liquid crystal display, port for communication with computer. Circuit of the device is also provided with three-wire cable which connects terminals of commutating unit with object to be measured. Device simplifies process of measurement, eliminates affect of components of current and voltage of multiple frequencies of main harmonic. Readings of current, voltage, frequency and power of open-circuit loss are fixed simultaneously to exclude affect of error of measuring circuit's losses (connecting wires and so on). Data of measurement are kept in electronic form in energy-independent memory of the device; the data can be sent to personal computer for making database and for keeping them in archive.

EFFECT: improved precision; improved efficiency.

4 cl, 2 dwg