US 11,754,641 B2
Transformer test system and method
Lam Truong Nguyen, Coppell, TX (US); and Yuan Wei, Flower Mound, TX (US)
Assigned to AVO Multi-Amp Corporation, Dallas, TX (US)
Filed by AVO Multi-Amp Corporation, Dallas, TX (US)
Filed on Oct. 5, 2021, as Appl. No. 17/494,586.
Claims priority of provisional application 63/088,338, filed on Oct. 6, 2020.
Prior Publication US 2022/0107365 A1, Apr. 7, 2022
Int. Cl. G01R 31/62 (2020.01); H01H 9/00 (2006.01)
CPC G01R 31/62 (2020.01) [H01H 9/0005 (2013.01); H01H 2009/0061 (2013.01)] 20 Claims
OG exemplary drawing
1. A method for testing a transformer, the method comprising:
applying an input voltage to any two secondary taps of the transformer in order to induce an induced voltage in a primary winding of the transformer;
measuring the induced voltage in the primary winding, and measuring secondary voltages in a plurality of secondary windings of the transformer;
simultaneously measuring phase angles as a function of the secondary voltages and the induced voltage;
calculating a plurality of winding ratios based on the induced voltage measurement, the secondary voltage measurements, and the phase angle measurements; and
identifying all secondary taps based on the phase angle measurements and the plurality of winding ratios.