{"schemaVersion":1,"slug":"ct-polarity-reference-transfer","name":"CT polarity-reference transfer","kind":"symbol","abbreviation":"CPT","aliases":["Current-transformer secondary arrangements","substations Current-transformer secondary arrangements","substations","Substations","CT polarity marks","Consistent relay polarity reference"],"category":"measurement-protection","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Carries the primary and secondary polarity relationship through the measurement drawing.","description":["Carries the primary and secondary polarity relationship through the measurement drawing. A current-transformer secondary arrangement carries a measuring current from a defined primary location to metering or protection inputs. Core identity, polarity and the connected circuit determine the measurement's meaning.","In a substation protection panel, separate CT cores can supply metering and protection circuits with different duties. A test boundary must preserve the secondary arrangement required by the selected CT and test device. For this reference, the drawing identifies “CT polarity marks” at the input and “Consistent relay polarity reference” at the output. Polarity is not inferred from page orientation.","Trace every secondary connection and the assigned earthing point against the actual connection diagram. These illustrations explain circuit roles and never prescribe a live CT switching or disconnection procedure. The functional block is an independent explanation of this named application. Equipment-specific ratings, terminal connections and operating conditions must be established in the project documentation."],"readingNotes":["Start at the named input: CT polarity marks. Identify its source device or document and the state represented on the drawing.","Follow the named output: Consistent relay polarity reference. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Polarity is not inferred from page orientation.","Trace every secondary connection and the assigned earthing point against the actual connection diagram. These illustrations explain circuit roles and never prescribe a live CT switching or disconnection procedure."],"drawingChecklist":["Label the source and connection reference for ct polarity marks.","Identify the destination and defined state of consistent relay polarity reference.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Polarity is not inferred from page orientation."],"distinction":"Polarity is not inferred from page orientation. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram.","facts":[{"label":"Representation","value":"Functional block"},{"label":"Installation focus","value":"Substations"},{"label":"Input / boundary","value":"CT polarity marks"},{"label":"Output / connection","value":"Consistent relay polarity reference"},{"label":"Lookup label","value":"CPT is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"instrument-transformers","relevance":"Public technical context for current-transformer secondary arrangements. Current and voltage measurement transformers and their secondary interfaces. The application text and educational graphic are independently authored; the publisher does not certify this representation."}],"related":["current-transformer","ct-test-terminal","ct-secondary-shorting-test-boundary"],"artwork":"pi26-ct-polarity-reference-transfer","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"substations","family":"ct-secondary","input":"CT polarity marks","output":"Consistent relay polarity reference"},"plainEnglish":{"title":"What this block does","introduction":"Carries the primary and secondary polarity relationship through the measurement drawing.","example":"In a substation protection panel, separate CT cores can supply metering and protection circuits with different duties. A test boundary must preserve the secondary arrangement required by the selected CT and test device. For this reference, the drawing identifies “CT polarity marks” at the input and “Consistent relay polarity reference” at the output. Polarity is not inferred from page orientation.","drawings":"Start at the named input: CT polarity marks. Identify its source device or document and the state represented on the drawing. Follow the named output: Consistent relay polarity reference. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"CT polarity marks"},{"name":"Output","meaning":"Consistent relay polarity reference"},{"name":"Application reference","meaning":"An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections."}],"diagram":"flow","steps":["CT polarity marks","CPT","Consistent relay polarity reference"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"Indoor current and voltage transformers","url":"https://www.abb.com/gb/en/areas/electrification/medium-voltage/grid-components/core-components/indoor-instrument-transformers"}],"profileId":"power-installation-ct-secondary"},"url":"https://eloragrid.ai/symbols/ct-polarity-reference-transfer","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/ct-polarity-reference-transfer.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"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 technical context for current-transformer secondary arrangements. Current and voltage measurement transformers and their secondary interfaces. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}