{"schemaVersion":1,"slug":"residual-voltage-winding-connection-reference","name":"Residual-voltage winding connection reference","kind":"symbol","abbreviation":"RWCR","aliases":["Voltage-transformer secondary arrangements","substations Voltage-transformer secondary arrangements","substations","Substations","Residual winding connections","Residual-voltage output"],"category":"measurement-protection","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Identifies the winding connection used to provide the assigned residual-voltage measurement.","description":["Identifies the winding connection used to provide the assigned residual-voltage measurement. A voltage-transformer secondary arrangement connects a defined primary voltage measurement to protection, metering or control inputs. Winding identity, fuse protection and the voltage reference must remain visible across the drawing.","In a substation bay, one voltage circuit can feed protection while a separately identified winding supplies metering. A voltage-selection circuit must make clear which bus or line measurement is being used. For this reference, the drawing identifies “Residual winding connections” at the input and “Residual-voltage output” at the output. Residual measurement depends on the winding arrangement.","Show the primary measurement point, secondary connection, protective devices and relay reference. A missing measurement can resemble a real system disturbance unless the voltage-circuit health is supervised appropriately. 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: Residual winding connections. Identify its source device or document and the state represented on the drawing.","Follow the named output: Residual-voltage output. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Residual measurement depends on the winding arrangement.","Show the primary measurement point, secondary connection, protective devices and relay reference. A missing measurement can resemble a real system disturbance unless the voltage-circuit health is supervised appropriately."],"drawingChecklist":["Label the source and connection reference for residual winding connections.","Identify the destination and defined state of residual-voltage output.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Residual measurement depends on the winding arrangement."],"distinction":"Residual measurement depends on the winding arrangement. 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":"Residual winding connections"},{"label":"Output / connection","value":"Residual-voltage output"},{"label":"Lookup label","value":"RWCR is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"instrument-transformers","relevance":"Public technical context for voltage-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":["voltage-transformer","potential-test-switch","vt-secondary-fuse-supervision-interface"],"artwork":"pi26-residual-voltage-winding-connection-reference","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"substations","family":"vt-secondary","input":"Residual winding connections","output":"Residual-voltage output"},"plainEnglish":{"title":"What this block does","introduction":"Identifies the winding connection used to provide the assigned residual-voltage measurement.","example":"In a substation bay, one voltage circuit can feed protection while a separately identified winding supplies metering. A voltage-selection circuit must make clear which bus or line measurement is being used. For this reference, the drawing identifies “Residual winding connections” at the input and “Residual-voltage output” at the output. Residual measurement depends on the winding arrangement.","drawings":"Start at the named input: Residual winding connections. Identify its source device or document and the state represented on the drawing. Follow the named output: Residual-voltage output. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Residual winding connections"},{"name":"Output","meaning":"Residual-voltage output"},{"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":["Residual winding connections","RWCR","Residual-voltage output"],"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-vt-secondary"},"url":"https://eloragrid.ai/symbols/residual-voltage-winding-connection-reference","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/residual-voltage-winding-connection-reference.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 voltage-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."}]}