TX Y-Y-D
Star-star-delta three-winding transformer
A star-star-delta transformer includes two star-connected winding sets and a delta tertiary winding.
SLD / Schematic
IEEE / ANSI · TX Y-Y-D
ANSI/IEEE Star-star-delta three-winding transformer form
IEEE-library form of star-star-delta three-winding transformer: a star-star-delta transformer includes two star-connected winding sets and a delta tertiary winding.
In plain English
What does ANSI/IEEE Star-star-delta three-winding transformer form mean?
This reference locates star-star-delta three-winding transformer in Autodesk's IEEE-oriented 3 phase transformers family. A star-star-delta transformer includes two star-connected winding sets and a delta tertiary winding. The schematic needs all three winding ratings and the intended tertiary connection. The public library uses HXF1T15 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.
A simple example
Trace each winding, supply and accessible neutral through the complete machine or transformer connection diagram. Keep the phase arrangement, terminal labels and any clock notation attached to the device; neither the convention label nor this educational outline supplies its ratings.
What the drawings help you do
Trace the tertiary separately so its protection and terminal status remain visible. A delta tertiary is a third winding, not an alternative connection of the main secondary. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted.
This particular reference
IEEE-library form of star-star-delta three-winding transformer: a star-star-delta transformer includes two star-connected winding sets and a delta tertiary winding. A delta tertiary is a third winding, not an alternative connection of the main secondary.
- Winding
- A coil of conductor inside an electrical machine or transformer.
- Phase
- One of the related AC waveforms in a power system.
- Terminal
- An identified point where a conductor connects.
Read the source: Autodesk IEEE Symbol Preview: 3 Phase Transformers
IEEE / ANSI · 3 Phase Star/Star/Delta with 3 Windings
Autodesk IEEE Symbol Preview: 3 Phase Transformers, block HXF1T15. Matching functional counterpart linked separately. Independently drawn educational geometry; not a certified IEEE glyph or database identifier.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
SLD / Schematic · TX Y-Y-D
What it represents
This reference locates star-star-delta three-winding transformer in Autodesk's IEEE-oriented 3 phase transformers family. A star-star-delta transformer includes two star-connected winding sets and a delta tertiary winding. The schematic needs all three winding ratings and the intended tertiary connection. The public library uses HXF1T15 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.
Trace each winding, supply and accessible neutral through the complete machine or transformer connection diagram. Keep the phase arrangement, terminal labels and any clock notation attached to the device; neither the convention label nor this educational outline supplies its ratings.
Trace the tertiary separately so its protection and terminal status remain visible. A delta tertiary is a third winding, not an alternative connection of the main secondary. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted.
How to read it
- Trace the tertiary separately so its protection and terminal status remain visible.
- The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation.
Information to show or reference
- State all three ratings
- Show both neutral arrangements
- Reference tertiary duty
A distinction that matters
A delta tertiary is a third winding, not an alternative connection of the main secondary.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Autodesk IEEE Symbol Preview: 3 Phase Transformers
Public IEEE-oriented 3 Phase Transformers table explicitly lists HXF1T15 as 3 Phase Star/Star/Delta with 3 Windings. This supports the vendor convention context, not reproduction of the publisher graphic.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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