116 / 2024-04-13 14:29:45

Simulation Study on Arc Reignition Characteristics and Its Suppression of HVDC Relays

HVDC relay,arc,arc reignition,suppression,contact erosion

Arc reignition is a key problem that restricts the improvement of arc extinguishing performance and the reduction of contact erosion in high-voltage direct current (HVDC) relays. In this paper, the arc reignition characteristics of HVDC relays are studied by simulation, the influence of arc reignition on contact erosion is analyzed, and the suppression effect of different improvement measures on arc reignition is further studied. First, the arc simulation model of the HVDC relay is established, and the electrical, thermal, and dynamic characteristics of the arc and the phenomenon of arc reignition are calculated. According to the distribution of the electric field and flow field, the cause of arc reignition occurring at the corner of the contact near the edge of the gap is clarified. Second, the influence of the re-ignited arc on the erosion characteristics of the contact is studied by the heat flux acting on the contact surface, and the influence has been proven not to be ignored. Finally, the effects of contact dislocation, adding a transverse baffle in the arc extinguishing chamber, enlarging contact fillet, and increasing contact breaking velocity on arc reignition are further studied. It is clear that the effective measure to suppress arc reignition is to reasonably increase the breaking velocity.