Why should the current-induced power supply (CT power supply) meet the requirements of short-term resistance to current shock?

Due to various reasons, such as inrush current and short circuit fault, the power system may flow several times the normal working current on the conductor. According to the different withstand voltage levels of the power grid, it is required that the equipment can withstand the short-term heavy current shock with the amplitude of 20kA, 3 1.5kA, 40kA and 50kA and the duration of 1s, 2s and 4s without being damaged, and the current induction power supply is mostly used for pursuing power supply. The equipment is required to work normally at tens of amperes, so the range of current it bears reaches thousands of times. Without special design, the current induction power supply module is easy to be damaged under the impact of large current, which is one of the main reasons why the common ct power collection device is difficult to popularize on a large scale.