1. Structure-Based Classification
Wound Type: The primary winding is physically wound on the core along with the secondary winding.
Bar Type: Uses a busbar or conductor as the primary winding without additional winding turns.
Bushing Type: The primary winding is a bushing carrying current, and the CT is built around it.
Core Balance Current Type: Used in differential protection systems to detect leakage currents.
Ring Type: Has a toroidal (ring-shaped) core, with the primary conductor passing through its center.
2. Service-Based Classification
Measuring CT: Used for measurement applications such as metering and monitoring current.
Protection CT: Designed for protection applications in electrical systems (e.g., overcurrent, differential, and relay protection).
Special Type Protection CT: Used in special protection schemes like restricted earth fault protection.
Dual Purpose CT: Serves both measurement and protection functions.
Single Ratio Multiple Core: Has a fixed transformation ratio with multiple cores for different functions.
Multiple Ratio Multiple Core: Offers multiple transformation ratios, useful for various protection and metering applications.
3. Insulation-Based Classification
Air Support: Uses air as an insulating medium.
Dry Type: Uses solid insulation like epoxy resin instead of oil or gas.
Oil Insulated: Filled with insulating oil to enhance dielectric strength and cooling.
SF6 Filled: Uses sulfur hexafluoride gas (SF6) for insulation, mainly in high-voltage applications.
4. Tank Design-Based Classification
Dead Tank: The core and winding are housed in a grounded metallic tank, providing better protection.
Live Tank: The tank itself is at high voltage, commonly used in outdoor installations.
This classification helps in selecting the right type of CT for different applications in power systems, ensuring accurate measurement and reliable protection.
Thanks For Reading ❤️
Artical by Lyriqon.
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