A boosting transformer refers to a transformer that can instantly start the voltage. There are relatively few transformer manufacturers in China that can effectively achieve instantaneous boosting. Boosting transformers have strong ability to instantly start and boost the voltage, and the boosting effect is good. The difference is that the non excited voltage regulating switch does not have the ability to switch gears with load, because this type of tap changer has a short-term disconnection process during the gear shifting process. Disconnecting the load current will cause arcing between the contacts to burn out the tap changer or short circuit, so the transformer must be powered off during gear shifting. Therefore, it is generally used for transformers that do not have strict voltage requirements and do not require frequent gear adjustment.