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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 the electrical system. First, the rated voltage must match the system's operating voltage to prevent insulation failure or damage. Second, the accuracy level is crucial, especially for metering and protection applications, as it determines how precisely the transformer can measure or relay current information. Third, the rated primary current and the transformation ratio are essential for matching the transformer to the expected load and ensuring accurate current scaling. Lastly, the power factor and the rated secondary load must be considered to ensure that the transformer operates efficiently under its designed conditions. Additionally, it's important to account for environmental factors such as temperature and humidity, which can affect the transformer’s performance. Proper selection also involves checking the burden capacity of the connected instruments to avoid overloading the secondary circuit. By carefully evaluating these aspects, engineers can select a current transformer that is both reliable and suitable for the intended application.