{"schemaVersion":1,"slug":"combined-ct-vt-yard-application-reference","name":"Combined CT-VT yard application reference","kind":"symbol","abbreviation":"CCYAR","aliases":["High-voltage primary equipment references","switchyards High-voltage primary equipment references","switchyards","Switchyards","Primary current and voltage","Assigned secondary measurement circuits"],"category":"power-distribution","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Groups the current and voltage measurement roles of the selected combined instrument transformer.","description":["Groups the current and voltage measurement roles of the selected combined instrument transformer. High-voltage primary equipment carries, interrupts, measures or conditions the main power circuit. Its function, insulation arrangement and equipment boundaries need to be distinguished from the secondary signals used to control it.","In a switchyard equipment diagram, the primary reference identifies the electrical role of an installed component while the linked equipment schedule and manufacturer drawing supply its exact construction and dimensions. For this reference, the drawing identifies “Primary current and voltage” at the input and “Assigned secondary measurement circuits” at the output. Each measuring function has its own characteristics.","Read the connected power path before interpreting a secondary output or alarm. These original educational component references provide no product dimensions, dielectric rating, installation clearance or construction approval. 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: Primary current and voltage. Identify its source device or document and the state represented on the drawing.","Follow the named output: Assigned secondary measurement circuits. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Each measuring function has its own characteristics.","Read the connected power path before interpreting a secondary output or alarm. These original educational component references provide no product dimensions, dielectric rating, installation clearance or construction approval."],"drawingChecklist":["Label the source and connection reference for primary current and voltage.","Identify the destination and defined state of assigned secondary measurement circuits.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Each measuring function has its own characteristics."],"distinction":"Each measuring function has its own characteristics. 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":"Switchyards"},{"label":"Input / boundary","value":"Primary current and voltage"},{"label":"Output / connection","value":"Assigned secondary measurement circuits"},{"label":"Lookup label","value":"CCYAR is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-hv-primary","relevance":"Public technical context for high-voltage primary equipment references. Primary switching equipment and instrument-transformer interfaces. The application text and educational graphic are independently authored; the publisher does not certify this representation."}],"related":["power-transformer","capacitor-voltage-transformer","shunt-reactor-primary-neutral-reference"],"artwork":"pi26-combined-ct-vt-yard-application-reference","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"switchyards","family":"hv-primary","input":"Primary current and voltage","output":"Assigned secondary measurement circuits"},"plainEnglish":{"title":"What this block does","introduction":"Groups the current and voltage measurement roles of the selected combined instrument transformer.","example":"In a switchyard equipment diagram, the primary reference identifies the electrical role of an installed component while the linked equipment schedule and manufacturer drawing supply its exact construction and dimensions. For this reference, the drawing identifies “Primary current and voltage” at the input and “Assigned secondary measurement circuits” at the output. Each measuring function has its own characteristics.","drawings":"Start at the named input: Primary current and voltage. Identify its source device or document and the state represented on the drawing. Follow the named output: Assigned secondary measurement circuits. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Primary current and voltage"},{"name":"Output","meaning":"Assigned secondary measurement circuits"},{"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":["Primary current and voltage","CCYAR","Assigned secondary measurement circuits"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"Gas-insulated switchgear","url":"https://www.hitachienergy.com/products-and-solutions/high-voltage-switchgear-and-breakers/gas-insulated-switchgear"}],"profileId":"power-installation-hv-primary"},"url":"https://eloragrid.ai/symbols/combined-ct-vt-yard-application-reference","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/combined-ct-vt-yard-application-reference.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pi26-hv-primary","publisher":"Hitachi Energy","title":"Gas-insulated switchgear","url":"https://www.hitachienergy.com/products-and-solutions/high-voltage-switchgear-and-breakers/gas-insulated-switchgear","scope":"Primary switching equipment and instrument-transformer interfaces.","type":"manufacturer","checkedOn":"2026-11-03","reuse":"link-only","relevance":"Public technical context for high-voltage primary equipment references. Primary switching equipment and instrument-transformer interfaces. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}