In this paper, the micro-phasor measurement system is developed to support phasor\nidentification of distribution transformers for the distribution mapping management system (DMMS)\nof Taiwan Power Company (TPC). The one pulse per second signal (1PPS) from the global positioning\nsystem (GPS) is used to synchronize the voltage sampling between reference and measurement sides.\nBy receiving 1PPS from GPS, the phasor measurement of three-phase voltage at the reference site\nof the substation is stored in the master station with a time-stamp. This paper proposes a timing\nsynchronous module with an embedded temperature compensated crystal oscillator (TCXO) to\ngenerate highly accurate timing for field measurement of underground distribution facilities. Mobile\ncommunication network is used to compare measurement results between reference and field sides\nof voltage angle that define distribution transformer phasor. This paper also designs and develops an\napplication for mobile devices by importing DMMS database, which is used to search the attributes of\nthe distribution transformers for measurement at the field. After the transformer phasor is identified,\nthe results are stored in the mobile device to update the attributes of distribution transformers\nin DMMS.
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