Three-phase current sampling circuit of protection device

• Main Authors: ZHANG PENGCHUN, HU YITE, QIU DINGHUI, LIU FENGJIAO, LIU CHAORU, HU YIDA
• Format: Patent
• Language: Chinese; English
• Published: 14.05.2024
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The utility model discloses a three-phase current sampling circuit of a protection device, which is characterized in that the three-phase current sampling circuit comprises three sampling circuits with the same structure, each sampling circuit respectively samples each phase of current, each sampling circuit comprises a current transformer, a sampling unit, a filtering unit and an ADC (Analog to Digital Converter) acquisition module, the current transformer is arranged in a main loop of the protection device, and the filtering unit is arranged in the ADC acquisition module. The sampling unit comprises a third resistor, the output end of the current transformer is connected with the two ends of the third resistor, and the filtering unit comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a thirty-fourth capacitor, a first magnetic bead, a second magnetic bead, a first resistor, a second resistor, a fourth resistor and a fifth resistor. According to the three-phase current sa