Red Seal Industrial Electrician Exam 2025 – 400 Free Practice Questions to Pass the Exam

The primary function of a current transformer (CT) is indeed to produce an output current that is proportional to the primary current. This principle allows CTs to measure high currents safely by transforming them into lower currents that can be easily handled by measuring instruments and protective devices.

CTs are essential in electrical systems for monitoring and controlling electrical load, ensuring system protection, and providing data for other equipment like relays and meters. When current flows through the primary winding of the CT, it generates a magnetic field, inducing a current in the secondary winding that maintains a specific ratio with respect to the primary current. This characteristic makes CTs invaluable in both industrial and commercial applications, as they allow for accurate measurement and monitoring of electrical currents without direct high-voltage exposure.

The other options do not accurately represent the role of a current transformer. For instance, increasing voltage for distribution is a function of a transformer but not of a current transformer. Converting AC to DC involves rectification processes, which are outside the scope of what a CT does. Measuring voltage fluctuations pertains to voltage transformers or other measurement devices, not current transformers. Therefore, the correct choice highlights the fundamental operation of current transformers in measuring electrical currents.