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What is the current CT range?
Current transformers (CTS) are devices used to measure alternating current (AC) in electrical circuits. They are designed to resign high currents to a safe and manageable level for measurement and protection purposes. CTs have a wide range of current ratings, typically ranging from a few milliamps to several thousand amps, depending on the application and specific electrical system requirements.
CT current measurement involves passing the primary current, which is the current to be measured, through the primary winding of the CT. The CT then produces a proportional secondary current in its secondary winding, which is directly proportional to the primary current. This secondary current can be measured using a meter or other measuring device to determine the magnitude of the primary current.
The rating of a CT in electrical terms refers to its maximum current capacity or rated current rating. It indicates the maximum current that the CT can accurately measure while maintaining its specified accuracy and performance characteristics. The rating of a TDM is usually expressed in terms of primary current, such as 5A, 100A, 1000A, etc.
To calculate the secondary current (IS) produced by a CT for a given primary current (IP), you can use the formula:
Is = (ip / np) * ns
Or:
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Is the secondary current
IP is the main stream
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NP is the number of turns in the primary winding
NS is the number of turns in the secondary winding
This formula explains the TDM turn ratio, which determines the ratio of primary current to secondary current. By knowing the primary current and turn ratio of the CT, you can calculate the secondary current produced by the CT for accurate current measurement.
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