{"schemaVersion":1,"slug":"current-transformer-with-primary-conductor-indication","name":"Current transformer with primary conductor indication","kind":"symbol","abbreviation":"CT PRI","aliases":["HXF1T33","VXF1T33"],"category":"measurement-protection","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEC","Manufacturer"],"summary":"This CT representation explicitly identifies the primary conductor passing through the measurement location.","description":["This CT representation explicitly identifies the primary conductor passing through the measurement location. It helps readers distinguish the power path from the instrument-transformer secondary connections."],"readingNotes":["Preserve the primary direction and polarity reference where directional protection uses the measurement.","The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation."],"drawingChecklist":["Mark primary conductor","Cross-reference secondary polarity","Identify connected meter or relay"],"distinction":"A conductor passing through a CT window is not an electrically connected secondary winding.","facts":[{"label":"Drawing role","value":"Current measurement"},{"label":"Representation scope","value":"Functional concept; not an official standard graphic or a product footprint"},{"label":"Public vendor block reference","value":"HXF1T33, VXF1T33 (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-ct","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."},{"sourceId":"instrument-transformers","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."}],"related":["current-transformer","ct-test-terminal"],"artwork":"edu-current-transformer-with-primary-conductor-indication","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/symbols/current-transformer-with-primary-conductor-indication","illustration":{"url":"https://eloragrid.ai/library/illustrations/current-transformer-with-primary-conductor-indication.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"autodesk-ct","title":"Current transformer symbol variants","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-40AAEF4A-AC3F-4B3D-90A5-A9E0707C1241.htm","type":"cad-reference","scope":"Current transformers, secondaries and conductor indications; vendor block identifiers are distinct from IEC symbol identifiers.","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":"instrument-transformers","title":"Indoor current and voltage transformers","publisher":"ABB","url":"https://www.abb.com/gb/en/areas/electrification/medium-voltage/grid-components/core-components/indoor-instrument-transformers","type":"manufacturer","scope":"Public current- and voltage-transformer product families. Ratings, terminals and dimensions depend on the model.","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."}]}