{"schemaVersion":1,"slug":"delta-delta-transformer","name":"Delta-delta transformer","kind":"symbol","abbreviation":"TX D-D","aliases":["HXF1T13","VXF1T13"],"category":"power-distribution","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEC","Manufacturer"],"summary":"A delta-delta transformer uses delta-connected windings on both sides.","description":["A delta-delta transformer uses delta-connected windings on both sides. The drawing communicates the winding connections while the vector group and device ratings specify the actual transformer arrangement."],"readingNotes":["Check phase-displacement notation when interconnecting supplies.","The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation."],"drawingChecklist":["Label both winding voltages","State vector group","Reference protection CT connections"],"distinction":"Two delta windings do not provide a star neutral point.","facts":[{"label":"Drawing role","value":"Winding connection"},{"label":"Representation scope","value":"Functional concept; not an official standard graphic or a product footprint"},{"label":"Public vendor block reference","value":"HXF1T13, VXF1T13 (Autodesk identifiers; not IEC symbol numbers)"},{"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."}],"references":[{"sourceId":"autodesk-transformers","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."},{"sourceId":"pub-symbol-three-phase-transformers","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."}],"related":["power-transformer","voltage-transformer"],"artwork":"edu-delta-delta-transformer","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/symbols/delta-delta-transformer","illustration":{"url":"https://eloragrid.ai/library/illustrations/delta-delta-transformer.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"autodesk-transformers","title":"Power, potential and autotransformer symbols","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-C1FE1690-DBF4-4F69-85C4-28E41F0A6392.htm","type":"cad-reference","scope":"Power transformers, voltage transformers, winding counts, screens and autotransformers.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."},{"id":"pub-symbol-three-phase-transformers","title":"AutoCAD Electrical: Three-phase transformer connections","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-EB13DB13-01EE-4541-BED7-19B9001BE8FC.htm","type":"cad-reference","scope":"Public vendor catalogue naming and functional variants. Vendor block names are not IEC identifiers. Linked for reference; no graphics or CAD files are redistributed.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."}]}