In the transformer planning process, the choice of wiring method is often not paid attention to. The three-phase transformer has A/B/C three-phase winding on the 1/2 side. The connection between them has a great impact on the operation performance of transformers, especially distribution transformers, and directly affects the quality of power supply. Therefore, the choice of wiring method is also a very important task for transformer planning cameos.
A terminal transformer is a transformer primary and secondary winding in a combination of ways indicated in wiring; The in-phase high and low voltage windings of the transformer are all wound on the same core column and are wound by the same main magnetic chain. When the main magnetic flux changes, there is a certain polarity relationship between the induced potential in the high and low voltage windings.
At any given moment, the potential at one end of the high-voltage winding is positive, as is the potential at the other end of the low-voltage winding. The end of the same polarity between two windings is called the same end of the same title and is denoted as "·" and vice versa. Regarding the synonym ending, it is denoted as "-".
The transformer terminal group is a method of indicating the combination of the primary winding and the secondary system.
The common transformer winding has two connections, namely, "triangle connection" and "star connection"; The transformer coupling group "d indicates a triangular connection, "n" indicates a star connection with the neutral line, Y indicates a star, and n indicates a neutral band; '11' indicates the interline voltage on the primary side of the transformer and the secondary side of the transformer, with the line voltage UAB lagging UAB 330 degrees (30 degrees or higher).
The transformer wiring group is indicated by a capital letter of the primary side (or primary side) wiring mode, and by a lowercase letter of the secondary side (or secondary side) wiring mode.
y (or y) is a stellar connection, and d (or d) is a triangular connection. The digital is indicated by a clock, which is used to indicate the phase relationship between the first and second lateral voltages. The transverse voltage phasor is used as a minute hand and is fixed at the position of the clock point, and the secondary voltage phasor is used as an hour hand.
"YN, DL1", where 11 means that when the primary-side voltage phase is pointed to the 12:00 position of the clock as a thin needle, the line voltage phasor of the secondary side is located at the 11:00 position of the clock. That is, the line voltage UAB on the secondary side lags 330 degrees behind the primary voltage UAB (or 30 degrees ahead).
Two winding transformers formed by combining four end groups: "Y,Y,,d,Y,Y,d" and "d,d". Use only "Y,Y" and "Y,d". Since the band is also connected to the neutral line Y and both non-spaced, from the neutral there is no sign that is not added with the addition of the letter n after the neutral line Y. n indicates that the neutral score has a preemptive advantage there. YN0 wiring group, UAB and UAB together, refer to minute hand 12. The "12" terminal in the new group, in the table a "0" bit is simply said: the primary and three different sequences or their articulation ends in the secondary windings of the transformer to end on each side by induced alternating current corresponding to which the phase angle to the reference is different.
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