Single-phase pad-mounted transformers are applied in residential power distribution, urban underground pipe networks, small commercial areas, public facilities, and new scenarios. They can convert 10~35kV high voltage to 120V/240V single-phase residential voltage, meeting the power supply needs homes, shops, street lights, and other scenarios. The volume of this type of product is only 1/3 of that of a European-style box transformer of the same, and it is lightweight, easy to install, and requires low infrastructure investment. Adopting an energy-efficient woundcore structure and a fully sealed oil-immersed integrated design it features excellent overload capacity, high continuous operation reliability, easy maintenance, and low operation and maintenance costs. At the same time, the fully enclosed shock-proof design provides a high of safety protection, combined with the advantages of low noise and low loss. The equipment can operate independently as a single unit, or three singlephase transformers can be combined to achieve-phase power supply. The underground installation shortens the length of the low-voltage distribution lines and reduces the power supply radius, which can reduce line loss by more than 5% and significantly improve the power supply quality. The product can adapt to harsh outdoor environments and is an efficient and reliable solution for small and medium-capacity power distribution scenarios.