Abstract: In order to effectively solve the problem of the damage of main transformer caused by short-circuit current impact on low and medium voltage side of main transformer, a transformer current limiting device based on eddy current drive is presented.The device connected the current-limiting reactor and fast switch in parallel to the transformer high-voltage side bus.By the current-limiting characteristics and the short-circuit current calculation before and after the access system, the device greatly reduced the short-circuit current and the main transformer fault caused by short-circuit in the low-voltage side of the main transformer was solved, which avoided the problems of low voltage and high loss caused by traditional current limiting technology, and suppressed the impact of short-circuit current on other devices.