How many commonly used shapes of current transformer are present?

Current transformers (CTs) are critical components in electrical engineering, used primarily for measuring electric currents by producing a reduced current proportional to the current in its primary circuit, allowing for safe monitoring and control. There are several commonly used shapes of current transformers, each suited to specific applications and installation requirements. The most prevalent types include:

1. Ring Type or Toroidal CT: This CT has a circular core with the conductor passing through the center acting as its primary winding. It is widely used for its accuracy, compact size, and ease of installation.

2. Bar-Type CT: In this configuration, the primary winding consists of a bar of suitable size and material forming an integral part of the transformer. It is known for its simplicity and is typically used for protection purposes in high-current applications.

3. Window or Wound Type CT: This type has an opening where the primary conductor is passed through the center. It differs from the ring type in that it has a primary winding wound on the core. It’s versatile and can be used in various applications, including metering and protection.

4. Split Core CT: This transformer can be opened and clamped around a conductor without disconnecting the circuit it monitors. It’s particularly useful for retrofit applications where disconnecting the power is not practical.

5. Rectangular or Square Type CT: These CTs are designed to fit around bus bars or irregularly shaped conductors, providing flexibility for installation where space constraints exist.

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