Design and Test Analysis of Surge Protective Device Based on Special Industrial Control Signal Acquisition Card

Abstract

Based on a special signal acquisition card of industrial control system, the electrical performance and interface environment of the transmission signal in the card are analyzed. Combined with the transmission line theory and the induced overvoltage theory of transmission line, the protection circuit of surge protective device (SPD) for the signal line and power line of the acquisition card is designed. The simulation impact test of the designed SPD verifies the rationality of the design and the SPD's Reliability. The design idea of SPD for special industrial control signal acquisition card is proposed.