Load requirements for current transformers
(1) The accuracy level of the current transformer
Current transformers are divided into different accuracy levels according to the size of the error during measurement. The accuracy level refers to the maximum error when the primary current is the rated value within the specified secondary load range.
(2) 10 percent error curve of current transformer
The 10 percent error curve of the current transformer is the relationship curve between the multiple n of the primary current and the maximum allowable secondary load impedance of the current transformer under the condition that the error of the current transformer does not exceed ±10 percent .
(3) The rated capacity of the current transformer
The rated capacity of the current transformer refers to the capacity of the secondary coil output when the current transformer operates under the rated secondary current and rated secondary impedance.
Since the secondary current of the current transformer is the standard value (5A or 1A), its capacity is also expressed by the rated secondary impedance. Because the error of the current transformer is related to the secondary load, the same current transformer will have different rated capacity when used in different accuracy levels.
The requirement of the current transformer for the load is that the sum of the load impedance cannot exceed the rated secondary impedance value of the transformer.
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