When we use DC voltage in a transformer, we know that the DC source will be damaged. However, in DCACLab, we can see that the simulation is accurate and the DC source in the transformer is operational. Thus, we are perplexed.
What happens when a DC voltage is applied to a transformer primary coil?
We should not use DC sources in transformers, Due to its low resistance, the primary winding of a transformer acts as a short circuit across the terminals of the DC source when a DC voltage is applied. This causes a large amount of current to flow through the winding, which causes the winding to overheat. The source or the winding will eventually become damaged. The impact of current on a winding is affected by the applied DC voltage, transformer rating, winding resistance, and the strength of the DC source. “If 5Vdc is applied to a 50KVA transformer, nothing will happen!”
When DC voltage is applied, we can’t not get any output of the voltage in the secondary side of the transformers. But a sudden spike can be recorded due to the initial current inrush and nothing else later.
For this reason, Oscilloscope can’t show the accurate simulation or DC source will be damaged. We should use AC source in the transformer instead of DC source.