Switch arc voltage measuring device and measuring method

The invention discloses a switch arc voltage measuring device and measuring method. The measuring device comprises a measuring capacitor unit, a signal acquisition unit and a data processing unit. The measuring capacitor unit comprises a high-voltage arm measuring capacitor and a low-voltage arm measuring capacitor; the signal acquisition unit is connected with the low-voltage arm measuring capacitor and is configured to perform corresponding acquisition and preprocessing on a voltage signal input by the low-voltage arm measuring capacitor; and the data processing unit is connected with the signal acquisition unit, and is configured to determine the arc voltage at the two ends of the switch contact fracture to be measured according to the preprocessed voltage signal data in combination with the voltage division proportional relation of the high-voltage arm measurement capacitance and the low-voltage arm measurement capacitance. According to the switch arc voltage measuring device and the measuring method prov