Control Transformer Home Page
Custom Transformers for Industrial Applications

Frequently Asked Questions

This section is for informational purposes only and should not be used as a design tool or to generate technical specifications. For further details, please contact CTI and discuss with a representative for clarification. Search for terms or questions by entering words or phrases in the text box and clicking Search, by selecting a category from the drop-down list and clicking Show. Then simply click on the linked term or question below.

Question: What is Exciting Current?

Answer: Exciting current, when used in connection with transformers, is the current or amperes required getting the transformer to the point where it will operate. A certain amount of energy is required to overcome the internal resistance of the steel core. The exciting current on most transformers varies from approximately 10% on small sizes of about 1 KVA and smaller to approximately .5% to 4% on larger sizes up to 1000 KVA. The exciting current is made up of two components, one of which is a real component and is in the form of losses or referred to as no-load watts; the other is in the form of reactive power and is referred to as KVAR.

« Back