An Improved Mobile Calibration Standard for Transformer Loss Measurement Systems

Existing mobile calibration standard used for on-site calibration of transformer loss measurement systems has been upgraded. Master-slave configuration of programmable power sources is replaced with the external triggering and synchronization method which ensures the system stability below 50 ppm. Resolution in phase-settings between voltage and current generation is now improved about 2-digits down to 1 m degrees. And, measurement results are automatically evaluated with the corrected calibration values of system components.