What does the term BURDEN relate to in current transformers?

The term "BURDEN" in the context of current transformers (CTs) specifically refers to the total volt-ampere (VA) load that the secondary circuit of the transformer must support. This concept is crucial because the burden affects both the accuracy and the performance of the current transformer. The burden includes all the devices connected to the secondary side, such as meters, relays, or any other load that draws power from the CT.

Understanding the burden is essential for ensuring that the current transformer operates within its specified limits. If the burden is too high, it can lead to inaccuracies in the measurements taken by the CT and can also cause overheating or damage to the transformer itself. Thus, maintaining an appropriate burden is key to the effective and safe operation of current transformers in electrical systems.