What type of transformer provides the ability to measure the flow of power in the system?

Current transformers are specifically designed to measure the flow of electrical current in a system. They achieve this by producing a reduced current that is proportional to the current flowing through their primary winding. This allows for safe measurement and monitoring of high currents without directly connecting measuring instruments to the high voltage lines.

In the context of power measurement, current transformers play a crucial role in protecting and monitoring the electrical grid. By measuring the current, they contribute to determining the power flow, as power can be calculated by knowing both the voltage and the current in the system.

While voltage transformers also have an important role in measuring voltage and providing isolation, they do not directly measure power flow like current transformers do. Power transformers are typically used for voltage conversion and electrical isolation, rather than measurement. Isolation transformers serve to isolate circuits rather than measure parameters like current or power. Therefore, current transformers are the correct choice for measuring the flow of power in the electrical system.