{"schemaVersion":1,"slug":"voltage-transformer","name":"Voltage transformer","kind":"symbol","abbreviation":"VT / PT","aliases":["potential transformer","PT","voltage instrument transformer","HXF1PT","VXF1PT"],"category":"measurement-protection","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEC","IEEE / ANSI"],"summary":"A transformer providing a voltage signal for metering or protection.","description":["A voltage transformer provides a secondary voltage related to the voltage on its primary winding. VT and PT, for potential transformer, are common terms encountered in power drawings. Its representation identifies a measurement function; winding connections, fuses, earthing and secondary circuits need their own documented detail.","A single line diagram places the VT at the system connection being measured. The associated schematic shows how that voltage reaches a meter, relay or control system. A power transformer can look similar in a simplified drawing, so the label and context matter."],"readingNotes":["Check the measured voltage connection and the number of windings or secondaries shown.","Read polarity, ratio and secondary earthing from the specified device documentation."],"drawingChecklist":["Identify the measured bus or feeder.","Record the specified ratio and accuracy information.","Cross-reference primary and secondary protection and terminals."],"distinction":"A VT supplies a voltage measurement; a power transformer supplies a power circuit. A shared transformer-like outline does not make their functions interchangeable.","facts":[{"label":"Quantity represented","value":"Voltage"},{"label":"Alternative term","value":"Potential transformer"},{"label":"Device data","value":"Model-specific winding and terminal information"},{"label":"Public Autodesk reference names","value":"HXF1PT, VXF1PT (vendor identifiers, not IEC symbol IDs)"}],"references":[{"sourceId":"autodesk-transformers","relevance":"Public potential- and voltage-transformer categories."},{"sourceId":"instrument-transformers","relevance":"Manufacturer instrument-transformer information."}],"related":["current-transformer","power-transformer","27-undervoltage","59-overvoltage"],"artwork":"vt","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/symbols/voltage-transformer","illustration":{"url":"https://eloragrid.ai/library/illustrations/voltage-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 potential- and voltage-transformer categories."},{"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":"Manufacturer instrument-transformer information."}]}