Window-type CTs do not contain a primary winding, instead, the primary conductor is a cable, or a busbar threaded through the window in the center of the toroidal transformer.
All three can either be single-ratio or multi-ratio type. For low and medium voltage applications, there are three main classifications based on construction window, bar, and wound. Types of Current TransformersĬTs are manufactured in various sizes, shapes, and ratings for a broad range of applications. The CTs main function is to transform a large current value into a smaller current value for accurate measurement and protection purposes.ĬTs are used for a wide range of indoor and outdoor applications including switchgears, generators, medium to high voltage circuit breakers, and differential and over current protection of power and distribution transformers.
Current Transformers, a type of instrument transformer, provide a safe way to monitor and measure primary current by producing an alternate, proportional current in its secondary winding. In the field, getting a direct measurement of high currents at high voltages present in power systems can be difficult.
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