Circuit DescriptionA 12-pulse rectifier is used as the current source to provide a DC test current, while a voltage oscillation circuit provides the recovery voltage after current switching. Auxiliary breakers and spark gaps are implemented in the circuit to connect these two sources to the test object at specific intervals. The specific implementation is as follows:12-Pulse Rectifier: The rectifier is controlled to provide a DC test current to the test breaker (TB) through a smoothing reactor L