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Transformers can be classified along multiple independent dimensions: by voltage transformation function, by construction and installation method, by cooling method, by core material and design, by number of phases, by winding arrangement, and by application domain.

A box transformer — also commonly known as a box-type transformer, compact transformer, or compact substation — is a factory-assembled, self-contained electrical distribution unit that integrates a transformer, high-voltage and low-voltage switchgear, protection devices, and auxiliary systems into a single weatherproof enclosure.

A low voltage distribution system is an electrical network that takes power from a step-down transformer and distributes it at standardized low voltages — typically 120 V, 208 V, 240 V, 277 V, or 480 V depending on the region and application.

This article provides a comprehensive comparison of the step-up transformer and step-down transformer, covering how each works, where each is used, their key design differences, and how to choose the right type for a given application.

A three phase oil immersed transformer — also called a three phase oil immersed power transformer — is a static electromagnetic device that transforms electrical energy between voltage levels in a three-phase AC power system.

A mineral oil transformer is a type of oil-immersed transformer in which the core and windings are fully submerged in mineral oil — a refined petroleum-based insulating oil.

An oil type transformer — also commonly known as an oil-immersed transformer — is an electrical transformer in which the magnetic circuit and windings are fully submerged in insulating oil inside a sealed steel tank. The oil performs two essential functions: it acts as a dielectric medium that insulates energized components from each other and from the grounded tank, and it serves as a cooling agent that absorbs and transfers heat generated by the core and windings during operation.

An oil-immersed transformer is a type of electrical transformer in which the magnetic core and windings are fully submerged in insulating oil (also called transformer oil) inside a sealed steel tank.

A residential transformer is a distribution transformer that steps down the medium voltage from the utility's primary distribution feeder  to the low voltage used inside homes: 120/240 V split-phase in the United States and Canada, or 220 V single-phase in many other countries.

An iron core transformer is an electrical transformer whose core is constructed from thin sheets of iron — specifically silicon steel — that are precisely cut, laminated, and stacked into a specific geometric configuration. The iron material provides a low-reluctance path for the magnetic flux that