{"schemaVersion":1,"slug":"secondary-injection-voltage-input-boundary","name":"Secondary-injection voltage input boundary","kind":"symbol","abbreviation":"SVIB","aliases":["Switchgear test and commissioning interfaces","switchgear Switchgear test and commissioning interfaces","switchgear","Switchgear","Injection voltage source","Relay voltage input"],"category":"control-circuits","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Identifies the measurement boundary used for an assigned voltage-injection test circuit.","description":["Identifies the measurement boundary used for an assigned voltage-injection test circuit. A test interface separates measurement, command and indication paths so their behavior can be checked in the documented test configuration. The test boundary must show which real equipment outputs remain enabled.","In a switchgear relay panel, test links can separate a protective relay from the trip coils while maintaining the specified current-transformer secondary arrangement. For this reference, the drawing identifies “Injection voltage source” at the input and “Relay voltage input” at the output. The real voltage source must remain distinguishable.","Trace the source and destination on each side of the test boundary. Use the selected test-device instructions for actual operations and never infer a safe current-transformer switching sequence from an educational diagram. 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: Injection voltage source. Identify its source device or document and the state represented on the drawing.","Follow the named output: Relay voltage input. Cross-reference its destination and separate the command from confirmation that the equipment responded.","The real voltage source must remain distinguishable.","Trace the source and destination on each side of the test boundary. Use the selected test-device instructions for actual operations and never infer a safe current-transformer switching sequence from an educational diagram."],"drawingChecklist":["Label the source and connection reference for injection voltage source.","Identify the destination and defined state of relay voltage input.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: The real voltage source must remain distinguishable."],"distinction":"The real voltage source must remain distinguishable. 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":"Switchgear"},{"label":"Input / boundary","value":"Injection voltage source"},{"label":"Output / connection","value":"Relay voltage input"},{"label":"Lookup label","value":"SVIB is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-masterclad","relevance":"Public technical context for switchgear test and commissioning interfaces. Breaker control, mechanism, position contacts, racking interlocks and test interfaces. The application text and educational graphic are independently authored; the publisher does not certify this representation."}],"related":["relay-test-block","test-plug","trip-isolated-relay-test-configuration"],"artwork":"pi26-secondary-injection-voltage-input-boundary","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"switchgear","family":"testing","input":"Injection voltage source","output":"Relay voltage input"},"plainEnglish":{"title":"What this block does","introduction":"Identifies the measurement boundary used for an assigned voltage-injection test circuit.","example":"In a switchgear relay panel, test links can separate a protective relay from the trip coils while maintaining the specified current-transformer secondary arrangement. For this reference, the drawing identifies “Injection voltage source” at the input and “Relay voltage input” at the output. The real voltage source must remain distinguishable.","drawings":"Start at the named input: Injection voltage source. Identify its source device or document and the state represented on the drawing. Follow the named output: Relay voltage input. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Injection voltage source"},{"name":"Output","meaning":"Relay voltage input"},{"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":["Injection voltage source","SVIB","Relay voltage input"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"Masterclad medium-voltage switchgear: circuit-breaker section interlocks","url":"https://productinfo.se.com/masterclad_mv_switchgear_ib/6055-30-masterclad-15kv-mv-switchgear-ib/English/6055-30%20Masterclad%20MV%20Switchgear%20Indoor%20%28bookmap%29_DD00646805.xml/%24/Section6-CircuitBreakerSectionInter-58DD6EC7"}],"profileId":"power-installation-testing"},"url":"https://eloragrid.ai/symbols/secondary-injection-voltage-input-boundary","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/secondary-injection-voltage-input-boundary.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pi26-masterclad","publisher":"Schneider Electric","title":"Masterclad medium-voltage switchgear: circuit-breaker section interlocks","url":"https://productinfo.se.com/masterclad_mv_switchgear_ib/6055-30-masterclad-15kv-mv-switchgear-ib/English/6055-30%20Masterclad%20MV%20Switchgear%20Indoor%20%28bookmap%29_DD00646805.xml/%24/Section6-CircuitBreakerSectionInter-58DD6EC7","scope":"Breaker control, mechanism, position contacts, racking interlocks and test interfaces.","type":"manufacturer","checkedOn":"2026-11-03","reuse":"link-only","relevance":"Public technical context for switchgear test and commissioning interfaces. Breaker control, mechanism, position contacts, racking interlocks and test interfaces. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}