What are the representation methods for the connection groups of transformer?

2025-10-23 15:24:03

The representation of the combined wiring form of the primary and secondary windings of transformer wiring. There are two common types of transformer winding. That is, in the "triangle connection" and "star connection" and transformer connection groups, "D" represents a triangle connection, "Yn" represents a star connection with a neutral wire, Y represents a star connection, n represents a neutral wire, and "11" represents that the line voltage Uab on the secondary side of the transformer lags behind the line voltage UAB on the primary side by 30 degrees (or 30 degree lead).

Capital letters indicate the wiring method for the primary side (or primary side), while lowercase letters indicate the wiring method for the secondary side (or secondary side). Y (or Y) is a star connection, and D (or D) is a delta connection.

These numbers are represented by a clock, which is used to indicate the phase relationship between the first-order and second-order line voltages. The phase of the primary line voltage is used as the minute hand and fixed at the 12 o'clock position of the clock, while the phase of the secondary line voltage is used as the hour hand.

Yn, d11 ", 11 indicates that when using the phase of the primary line voltage as the minute hand at the 12 o'clock position of the clock, the phase of the secondary line voltage is at the 11 o'clock position of the clock. The line voltage Uab on the secondary side lags behind the line voltage UAB on the primary side by 330 degrees (or 30 degree lead).

The combination of two windings in an transformer forms four wiring lines: "Y, Y", "D, Y", "Y, D", and "D, D". Our country only uses "Y, Y" and "Y, d".

This is because there is no symbol added when there is a neutral line or when there is no neutral line. When there is a neutral line, there are two Y connections with the addition of the text n after the text Y.

N indicates that the neutral point has a contour. The UAB and UAB of the Yn0 wiring group overlap, with the clockwise and minute hands pointing towards 12. In the new wiring group, "12" is represented by "0".