Experimental Investigation of Changes in Iron and Copper Losses in the Transformer

Abstract

The idle run test in transformers is done to find the iron losses of the transformer. In the no-load test, the secondary winding ends of the transformer are open-circuited, and the rated-rated voltage is applied to the primary winding ends. Since the current drawn from the network in idle operation is small, no-load copper losses are neglected, and all idle power drawn is considered iron losses. The study examined the variation of iron losses at various voltage values applied to the transformer's primary. The iron losses showed a non-linear change depending on the applied voltage. When a load is connected to the secondary of the transformer, it has been observed that as the load increases, the iron losses do not change depending on the load and remain constant. Short circuit tests find copper losses in transformers. The test is done from the primary or secondary side. Since the applied voltage is small in the quick circuit test, iron losses are neglected. The copper losses at various loads were calculated by increasing the load connected to the secondary transformer.