Fixed Tap Changer (Fixed Tap Changer) and On-Load tap changer (OLTC) are both devices used to regulate the output voltage of a Transformer, but they work differently and in different application scenarios. Here are the differences between the two types of transformers:Fixed Tap Transformer (Fixed Tap Transformer)Working principle Fixed tap-changer transformers usually have only one or a few pre-set tap-changer positions, which determine the ratio of the transformer. When the transformer ratio ne