Burden of a Current Transformer

A current transformer converts a high primary current with a secondary winding around a magnetizable core to a lower secondary current. A current transformer is passive, therefore no external power supply is connected, and what is secondary connected forms a load for the current transformer. In short, the connecting wires and the connected meter form the load of the current transformer. In technical terms this is called load in VA. This load is of influence on the accuracy of the current transformer.

In the design of the current transformer, internal losses and the external load of the current transformer are taken into account. The current transformer acts as a power source.

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