current chopping in CB is the incident of arc current interruption before normal current zero is reached.If This current is enough to deliver a voltage which is greater than restriking voltage then the arc will continue again. But gradually the current falls and certainly the voltage also reduces and finally fall down the restriking voltage and ultimately arc is extinguished. It results in voltage oscillation in the line which affects the electrical equipments. I think it is severe in Vacuum circuit breakers (VCB)