Current transformers are connected in relation to the load?

Current transformers (CTs) are designed to provide a way to measure larger currents by producing a smaller, manageable current that can be safely measured. They are connected in relation to the load in a series configuration.

When CTs are connected in series with the load, they help to ensure that the same current flowing through the load also flows through the CT. This configuration allows the CT to accurately reflect the load current, which is crucial for various applications such as monitoring and protection of electrical equipment.

In terms of operational functionality, a series connection allows the CT to measure the full current passing through the line while offering isolation and reducing the high current levels to a lower, safe value for measurement purposes.

Other configurations like parallel, single-phase, or three-phase do not accurately describe the operational relationship of a CT in relation to measuring load current. In parallel configurations, for instance, the current could divide, leading to inaccurate measurements. In single-phase and three-phase contexts, while CTs can be used in both scenarios, the specific question regarding how they are connected to measure the load current most directly points to a series connection.