The role of the transformer-related symbols, and the relevant transformer model is generally composed of letters and a string of numbers, so what is the difference between these letters and numbers? In general, the transformer model consists of a symbol indicating the number of phases, cooling method, voltage regulation method, winding core, and the transformer capacity, rated voltage, and winding connection.
Letter symbols: D, S, J, L, Z, SC, SG, YD, JMB, BK(C), DDG D for single phase; S for three phases; J for oil immersion from cold; L for windings for aluminum wire ;Z indicates on-load voltage regulation; SC indicates three-phase epoxy casting; SG indicates three-phase dry self-cooling, SG transformer is a pointer
Designed for the voltage of imported equipment is different from the voltage of China's power grid. The design voltage level is below 1000V, and the 380V of the Chinese mainland power grid is converted into different voltages to supply power to the equipment. The main product voltage levels are: input: 380V, 400V, 420V, 440V, output: 440V, 220V, 200V, 127V, 110V, 100V , 36V, 24V, etc. YD indicates the test order
Phase transformer; JMB represents lighting transformer; DDG-single-phase dry low-voltage high-current transformer