Transient Recovery Voltages Measurement and Surge Protection of the LV Vacuum Circuit Breakers

摘要

In low voltage power electrical circuits where switching operations are made through the contactors or vacuum circuit breakers, switching transient overvoltages (TRV) occurs. When disconnect a vacuum contactor in between this device and consumer electromagnetic energy accumulates and thus overvoltages are generated which additional overcharge the electrical insulation. To prevent undesirable switching overvoltages while switching inductive circuits, the transient overvoltages must be limited to the lowest possible values and for this dedicated devices are known as transient surge suppressors or transient voltage suppressors (TVS). A measuring circuit for transient switching overvoltage allows determination of their shape and maximum values obtained from using new types of transient voltage suppressors. The study was performed using a data acquisition board connected to a PC via a USB connection and HP VEE Pro 8.0 software, also used to design the theoretical model of switching transient overvoltages parameters.