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d
Explanation: The rating of the secondary current is the maximum current that can be
passed through the secondary windings. It is 5 A for the current transformer.
The value of the rated secondary current in the context of transformers and electrical engineering is typically set to a standard value for ease of use and compatibility with protective relays and metering equipment. The most common value is 5 Amperes (A) for CTs (Current Transformers). This standardization allows for simpler design and universal applicability of secondary equipment such as relays and meters, regardless of the primary current magnitude.