Development of network impedance measurement techniques for low-voltage distribution lines - validation of measurement method using harmonics on a full-scale experimental distribution line

The impedance when various equipment, including the distribution line and consumer equipment connected to the distribution line, are operating is called network (or on-line, effective) impedance. Methods for measuring the network impedance in power distribution systems where various consumer equipment are in operation require a basic understanding of the situation using a full-scale distribution line before making measurements on actual distribution lines. A prototype measuring device has been developed to assess network impedance using harmonic currents generated by load from the fundamental frequency up to 9 kHz. This device was used to conduct network impedance measurements on a full-scale experimental distribution line at the Akagi Testing Center of CRIEPI. This paper reported the validation of the measuring equipment for the network impedance on a full-scale experimental distribution line. It provided insights into the behavior of network impedance when the consumer equipment is in operation.