Dry-type Transformer Wiring Link Method

The wiring level of dry-type transformers is the expression of the wiring method of dry-type transformers that are formed by winding resistance and rewinding;
There are two wiring methods for common dry-type transformer winding, namely "trilateral wiring" and "star wiring"; In the connection class of dry-type transformers, "D is expressed as trilateral wiring, "Yn" is expressed as star wiring with neutral wire, Y is expressed as star with neutral wire, Y is expressed as star shape, n is expressed with neutral wire; "11" indicates that the phase voltage Uab on the back side of the dry-type transformer is one time behind the working voltage UAB330 degrees (or 30 degrees ahead). Other expressions of the connection group of dry-type transformers are: English capital letters express the wiring method of the primary side (or primary side), and lowercase letters express the wiring method of the secondary side (or secondary side). Y (or y) is star routing and D (or d) is trilateral routing. The large number adopts the clock notation to express the position correlation of the working voltage of the side line again, the phasor of the working voltage of the side line as the minute hand, the fixed finger refers to the part of the clock at 12 o'clock, and the phase voltage phasor on the side again is used as the second hand.
Power transformer manufacturers introduce "Yn, d11", in which 11 is the expression: when the working voltage phasor of the side line is used as the minute hand to point at the 12 o'clock of the clock, the phase voltage phasor on the side again is at the 11 o'clock part of the clock. That is to say, the phase voltage Uab on the second side is 330 degrees (or 30 degrees ahead) behind the working voltage UAB by one side. The two windings of dry-type transformers produce four wiring grades: "Y, y", "D, y", "Y, d" and "D, d". In China, only "Y,y" and "Y,d" are used. Because when Y is connected, there are also two kinds of neutral and without neutral line, without neutral line does not enhance all marker expression, with neutral line after the English letter Y with English letter n expression. n Neutral points expressed have lead lines. Yn0 wiring level, UAB overlaps UAB and UAB, hour and minute hands are pointed to 12. "12" is expressed as "0" in the new wiring class.