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Winding connection designations

High Voltage Always capital letters

Delta - D

Star - S

Interconnected star - Z

Neutral brought out - N

Low voltage Always small letters

Delta - d

Star - s

Interconnected star - z

Neutral brought out - n

Phase displacement

Phase rotation is always anti-clockwise.

(international

adopted convention)

Use the hour indicator as the indicating phase

displacement

angle. Because there are 12 hours on a clock, and a

circle

consists out of 360°, each hour represents 30°.

Thus 1 = 30°, 2 = 60°, 3 = 90°, 6 = 180° and 12 = 0°

or

360°.

The minute hand is set on 12 o'clock and replaces the

line

to neutral voltage (sometimes imaginary) of the HV

winding.

This position is always the reference point.

Because rotation is anti-clockwise, 1 = 30° lagging

(LV

lags HV with 30°)and 11 = 330° lagging or 30°

leading (LV

leads HV with 30°)

To summarise:

Dd0

Delta connected HV winding, delta connected LV

winding, no phase shift between HV and LV.

Dyn11

Delta connected HV winding, star connected LV

winding with

neutral brought out, LV is leading HV with 30°

YNd5

Star connected HV winding with neutral brought out,

delta

connected LV winding, LV lags HV with 150°

" So there is no specification of Dy11.. it will be

Dyn11 "

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Q: What is the difference between Dyn-11 and Ynd-11?
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