{"schemaVersion":1,"slug":"ansi-three-phase-star-autotransformer","name":"ANSI/IEEE Three-phase star autotransformer form","kind":"symbol","abbreviation":"AT 3PH Y","aliases":["HXF1T19","VXF1T19","IEEE 3 Phase Autotransformer Star Connected","ANSI Three-phase star autotransformer"],"category":"power-distribution","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEEE / ANSI","Manufacturer"],"summary":"IEEE-library reference for three-phase star autotransformer, with its operating meaning, connection notes and public vendor block identity.","description":["This reference locates three-phase star autotransformer in Autodesk's IEEE-oriented transformers family. A three-phase star-connected autotransformer has electrically shared winding portions arranged in a three-phase star connection. Its neutral and tap connections need explicit identification. The public library uses HXF1T19 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.","Determine how the common star point and any accessible neutral are used by the design. A star autotransformer is electrically different from a star-star two-winding transformer. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted."],"readingNotes":["Determine how the common star point and any accessible neutral are used by the design.","The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation."],"drawingChecklist":["Show star point","State winding voltage ratios","Reference tap terminals"],"distinction":"A star autotransformer is electrically different from a star-star two-winding transformer.","facts":[{"label":"Convention evidence","value":"Autodesk IEEE Symbol Preview: Transformers; published form: 3 Phase Autotransformer Star Connected."},{"label":"Public vendor block","value":"HXF1T19. Vendor library token, not an IEEE symbol number."},{"label":"Drawing role","value":"Winding connection"},{"label":"Identifier status","value":"The short label is a functional lookup label, not an assigned IEC or IEEE symbol number. Any separately listed Autodesk code is a verified vendor block name."},{"label":"Artwork scope","value":"Original educational geometry. Exact standard graphics, product ratings and terminal pinouts are not certified."}],"references":[{"sourceId":"ansi-autodesk-68d02867-7a98-47d1-a83f-dbad1ddb616f","relevance":"Public IEEE-oriented Transformers table explicitly lists HXF1T19 as 3 Phase Autotransformer Star Connected. This supports the vendor convention context, not reproduction of the publisher graphic."}],"related":["three-phase-star-autotransformer","power-transformer","voltage-transformer"],"artwork":"s28-ansi-three-phase-star-autotransformer","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEEE / ANSI","form":"3 Phase Autotransformer Star Connected","reference":"Autodesk IEEE Symbol Preview: Transformers, block HXF1T19. Matching functional counterpart linked separately. Independently drawn educational geometry; not a certified IEEE glyph or database identifier.","counterpart":"three-phase-star-autotransformer"},"plainEnglish":{"title":"What does ANSI/IEEE Three-phase star autotransformer form mean?","introduction":"This reference locates three-phase star autotransformer in Autodesk's IEEE-oriented transformers family. A three-phase star-connected autotransformer has electrically shared winding portions arranged in a three-phase star connection. Its neutral and tap connections need explicit identification. The public library uses HXF1T19 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.","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.","drawings":"Determine how the common star point and any accessible neutral are used by the design. A star autotransformer is electrically different from a star-star two-winding transformer. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted.","terms":[{"name":"Winding","meaning":"A coil of conductor inside an electrical machine or transformer."},{"name":"Phase","meaning":"One of the related AC waveforms in a power system."},{"name":"Terminal","meaning":"An identified point where a conductor connects."}],"diagram":"flow","steps":["Identify the device and form","Read the connections and state","Check the equipment reference"],"caption":"A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.","sources":[{"label":"Autodesk IEEE Symbol Preview — Transformers","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-68D02867-7A98-47D1-A83F-DBAD1DDB616F.htm"}],"detail":"IEEE-library reference for three-phase star autotransformer, with its operating meaning, connection notes and public vendor block identity. A star autotransformer is electrically different from a star-star two-winding transformer.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/ansi-three-phase-star-autotransformer","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/ansi-three-phase-star-autotransformer.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"ansi-autodesk-68d02867-7a98-47d1-a83f-dbad1ddb616f","title":"Autodesk IEEE Symbol Preview — Transformers","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-68D02867-7A98-47D1-A83F-DBAD1DDB616F.htm","type":"cad-reference","scope":"Verified public IEEE-oriented vendor catalogue. Block names identify vendor symbols, not IEEE standard symbol numbers. Linked only; graphics and CAD files are not redistributed. IEEE/ANSI 315-1975 is a historical graphics reference with Inactive-Reserved status; this page does not certify current standards compliance.","checkedOn":"2026-10-14","reuse":"link-only","relevance":"Public IEEE-oriented Transformers table explicitly lists HXF1T19 as 3 Phase Autotransformer Star Connected. This supports the vendor convention context, not reproduction of the publisher graphic."}]}