What procedure is used when a transformer rated meter becomes overloaded?

When a transformer-rated meter becomes overloaded, the appropriate procedure is to change the current transformer. Overloading can occur when the current passing through the meter exceeds its rated capacity, which can lead to inaccurate readings or potential damage to the meter.

The current transformer (CT) is a crucial component that steps down high current levels to a more manageable level for the meter to accurately measure. If the CT is undersized for the application, it may not be able to properly handle the excess current, resulting in measurement errors or damage. By replacing the current transformer with one that has a higher rating, the system ensures that the meter can operate within safe limits and provide accurate readings.

In the context of the other options, changing the frequency regulator, power supply, or meter battery does not address the specific issue of overloading. The frequency regulator manages the frequency of the electrical system, which is unrelated to the current measurement. The power supply's role is to provide the necessary energy for the system to function, while the meter battery powers the internal circuitry of the meter, but none of these options would resolve the problem of an overloaded transformer-rated meter.