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When selecting a current transformer, which parameter should I choose?
The current transformer should be chosen based on four key parameters to ensure proper performance and safety in electrical systems. First, the rated voltage must match the system's operating voltage to avoid overvoltage damage. Second, the accuracy level is crucial, especially for metering or protection applications, as it determines how precisely the CT can measure current. Third, the rated primary current and the transformation ratio are essential for ensuring the CT can handle the expected load and provide accurate secondary output. Lastly, the power factor and the rated secondary load must be considered to ensure the CT operates within its designed capacity and maintains efficiency. Proper selection of these parameters ensures reliable operation, reduces errors, and enhances the overall safety of the electrical system. It's also important to consider environmental conditions and installation requirements when choosing a current transformer.