Power transformer type and characteristics

Power transformer type and characteristics of commonly used power transformer classification can be summarized as follows: (1) by the number of phases: (1) single-phase power transformer: for single-phase load and three-phase power transformer group. (2) three-phase power transformer: three-phase system for the rise and fall voltage. (2) by cooling: (1) dry power transformer: rely on air convection cooling, generally used for local lighting, electronic circuits and other small-capacity power transformers. (2) oil-immersed power transformers: rely on oil for cooling medium, such as oil from the cold, oil-immersed air-cooled, oil-immersed water, forced oil circulation. (3) by the use of points: (1) Power Transformer: transmission and distribution system for the rise and fall voltage. (2) Instrument 10kva single phase transformer: such as voltage transformers, current transformers, for measuring instruments and relay protection devices. (3) test transformer: can produce high voltage, high voltage test of electrical equipment. (4) special transformers: such as electric furnace transformers, rectifier transformers, transformers and so on. (4) according to the form of winding: (1) dual-winding transformer: used to connect the two power system voltage level. (2) three-winding transformer: generally used for power system regional substation, connecting three voltage levels. (3) auto-transformer: used to connect different voltage power system. Can also be used as an ordinary step-up or down after the transformer. (5) according to the core form: (1) core prefabricated compact transformer: for high voltage power transformer. (2) amorphous alloy transformer: Amorphous alloy core transformer is a new magnetic materials, no-load current decreased by about 80%, is the ideal energy-saving effect of distribution transformers, especially for rural power grids and developing areas Load rate is low. (3) shell-type transformers: for high-current special transformers, such as electric furnace transformers, welding transformers; or for electronic equipment and television, radio and other power transformers.