A pad-mounted transformer, also known as a box-type substation or combined substation, integrates high and low-voltage switchgear and transformers into a complete set of outdoor power transformation and distribution equipment. These substations are compact, aesthetically pleasing, and suitable for use in urban areas and as construction power sources. With the ongoing modernization and urban distribution network upgrades, box-type substations have become widely used in residential power distribution. There are two primary types: European-style and American-style.
To address oil pollution, Jinshida uses a sub-box structure, separating the upper and lower oil tanks. The upper tank contains high-voltage components like load switches and fuses, while the lower tank holds the transformer body and no-load tap changer. This design prevents arc-generated carbonization in the upper tank from contaminating the lower tank, maintaining insulation performance and ensuring reliable operation. The heat generated by the transformer loss in the lower tank is isolated, keeping the upper tank temperature low and enhancing the reliability of high-voltage components. This sub-box structure effectively mitigates oil pollution issues.
