What is the burden of the instrument transformer?

The burden of an instrument transformer refers to the load impedance that it presents to the secondary circuit. In other words, it's the impedance that the secondary winding of the transformer sees when it's connected to the measuring or protection circuit.

For current transformers (CTs), the burden is typically expressed in ohms and represents the impedance of the connected measuring or protection devices. For potential transformers (PTs), the burden is also expressed in ohms and represents the impedance of the connected load.

The burden is an important consideration because it affects the accuracy of the instrument transformer's output. If the burden is too high, it can cause voltage or current distortion and lead to inaccuracies in measurement or protection. Conversely, if the burden is too low, it can overload the transformer and cause overheating or damage. Matching the burden of the instrument transformer to the requirements of the measuring or protection circuit is essential for reliable operation.



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