In medium voltage equipment, the roles of protection and measurement transformers are as follows:

1. Protection Transformers: These transformers are used to protect equipment in the power system from overcurrent, short circuits, and other electrical faults. They prevent equipment damage by detecting abnormal current or voltage and triggering circuit breakers or other protective devices.
   
   

2. Measurement Transformers: These transformers are used for accurate measurement of current and voltage in the power system. They convert high voltage or high current into lower, measurable values so that instruments and control devices can safely read and analyze them.
   
   

Overall, protection and measurement transformers play a critical role in ensuring the safe and reliable operation of the power system.