Lissajous figure analytical method based transformer power frequency signal sensor system

The invention aims at solving measurement and switching of online voltage and current values confirming to requirements in a Lissajous figure analytical method and discloses a Lissajous figure analytical method based transformer power frequency signal sensor system. According to the technical scheme, the Lissajous figure analytical method based transformer power frequency signal sensor system comprises a mutual inductor and a signal processing circuit; the mutual inductor is used for collecting voltage or currents of a transformer; the signal processing circuit comprises two input ends and an output end. The Lissajous figure analytical method based transformer power frequency signal sensor system can effectively restrain common mode interference, switches differential signals into single-ended signals and meanwhile filters harmonic signals other than power frequency fundamental waves.