A box-type substation transformer — interchangeably called a compact substation, prefabricated substation, or packaged substation — is a factory-assembled unit that contains the transformer, high-voltage (HV) switchgear, low-voltage (LV) distribution panels, protection and. A box-type substation transformer — interchangeably called a compact substation, prefabricated substation, or packaged substation — is a factory-assembled unit that contains the transformer, high-voltage (HV) switchgear, low-voltage (LV) distribution panels, protection and. Therefore, transformers in the construction industry are not just simple power conversion tools, but "power fortresses" that require reinforcement. In current construction power supply, box-type substations are the absolute protagonists. These compact and self-contained units have revolutionized the way power is distributed, offering significant advantages in. Larson Electronics manufactures and distributes a wide variety of three phase and single phase portable power distribution systems. From skid mounted temporary power distribution substations to dolly cart mounted transformers, these power distribution panels are designed for use in construction. Construction site transformers provide a 110V RLV supply and are available in ratings from 3 kVA to 20 kVA, single-phase and three-phase options, in a range of enclosure designs. Different distribution arrangements of 16A and 32A sockets and / or hard wired lighting outlets with MCB protection and.