Where is the overcurrent protective device located in a CSP transformer?

The correct choice indicates that the overcurrent protective device is situated on the secondary side inside the tank, positioned between the secondary bushing and the secondary coil. This placement is crucial because it allows the protective device to monitor the current flowing from the transformer to the load on the secondary side. If an overcurrent condition occurs, such as during a short circuit or an overload, the device can quickly engage to disconnect the load, thereby protecting both the transformer and the connected equipment from damage.

This configuration is standard practice in transformer design because it helps ensure that any excessive current is detected close to the source of the potential issue, allowing for rapid response and minimizing risk. Furthermore, having the device securely located inside the tank offers protection from environmental factors that could affect its operation, contributing to overall system reliability and safety.

Other options do not represent the typical placement of overcurrent protection devices in transformers, as they either suggest a location not conducive to effective monitoring of secondary current or imply a setup that might compromise the protection mechanism.