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: b
Explanation: The current transformers is divided into 2 types. They are I) measuring
current transformer and II) protective current transformer
Current transformers (CTs) can be classified based on several different criteria, each serving a particular set of purposes or applications in electrical engineering. Here are the primary classifications:
1. Core Type and Shell Type
– Core Type: In core type transformers, the primary winding is wound around the core. These are often used in high-voltage applications.
– Shell Type: Shell type transformers encase the primary and secondary windings with the core material, providing better magnetic circuit characteristics.
2. Winding Configuration
– Single Ratio: These transformers have a single primary to secondary winding ratio, fixed for a specific application.
– Multi Ratio: These come with taps that can adjust the turns ratio, accommodating various conditions and requirements.
3. Insulation Type
– Dry Type: These transformers do not use liquid for cooling and are often used in indoor applications for safety reasons.
– Oil Immersed: These use oil both for insulation and cooling, suitable for high voltage and power level applications.
4. Application Based Classification
– Protection CT: Designed for protective relay applications, focusing on accuracy at higher fault currents.
– Metering CT: These are used for metering and measuring electricity usage, requiring high accuracy at standard load currents.
5. Installation Location
– Indoor CT: Specifically designed for indoor use, often with less robust insulation since they are not exposed to the elements.
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