What device is used for phasing two transformers in parallel?

The device used for phasing two transformers in parallel is a multimeter. This tool is essential for verifying that the voltage, phase, and frequency of both transformers are synchronized before connecting them in parallel. When transformers are paralleled, it is crucial that they are in phase to prevent circulating currents, which can lead to equipment damage.

A multimeter can measure the voltage output of each transformer and confirm that both are operating at the same voltage and phase relationship. It can also check for the polarity of the transformer windings; if the polarities are not aligned, connecting them could result in a destructive short circuit.

Other devices, while useful in measuring electrical parameters, are not as suitable for this specific task. A voltmeter only measures voltage but doesn't provide information on phase, while an oscilloscope can display waveforms but may not be practical for simple phase checks in transformers. An amperemeter focuses solely on current measurement, which is not adequate for confirming proper phasing before paralleling transformers.