The 1st Field Test of Smart Phase Identification System, developed by Smart Grid Research Center, TGGS, in PEA’s Nakhon Chaisri Branch. On average, it takes about 40 min for a survey time of meter’s connected phase per transformer. We have received a greatly appreciated feedback from PEA’s engineers and technicians. We would like to express our sincere thanks to PEA for supporting this R&D project.