{"schemaVersion":1,"slug":"tap-change-incomplete-operation-alarm","name":"Tap-change incomplete-operation alarm","kind":"symbol","abbreviation":"TIA","aliases":["Transformer regulation and cooling control","substations Transformer regulation and cooling control","substations","Substations","Tap command and travel status","Incomplete tap-change alarm"],"category":"measurement-protection","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Detects failure of a requested tap movement to achieve its defined completion feedback.","description":["Detects failure of a requested tap movement to achieve its defined completion feedback. Transformer regulation changes the selected winding connection to influence voltage, while cooling control manages the installed fans and pumps. Commands, mechanical position and measured results belong to different parts of the diagram.","In a substation, a voltage regulator can request a tap change and check the resulting tap-position feedback. A separate controller stages cooling equipment according to the transformer manufacturer's defined conditions. For this reference, the drawing identifies “Tap command and travel status” at the input and “Incomplete tap-change alarm” at the output. Alarm timing must follow the mechanism data.","Keep tap-change permission, limit contacts, movement indication and measured voltage distinct. Actual tap positions, time delays, cooling ratings and allowable parallel operation require the selected transformer control design. 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: Tap command and travel status. Identify its source device or document and the state represented on the drawing.","Follow the named output: Incomplete tap-change alarm. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Alarm timing must follow the mechanism data.","Keep tap-change permission, limit contacts, movement indication and measured voltage distinct. Actual tap positions, time delays, cooling ratings and allowable parallel operation require the selected transformer control design."],"drawingChecklist":["Label the source and connection reference for tap command and travel status.","Identify the destination and defined state of incomplete tap-change alarm.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Alarm timing must follow the mechanism data."],"distinction":"Alarm timing must follow the mechanism data. 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":"Tap command and travel status"},{"label":"Output / connection","value":"Incomplete tap-change alarm"},{"label":"Lookup label","value":"TIA is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-transformer-control","relevance":"Public technical context for transformer regulation and cooling control. Transformer temperature, cooling, tap changing and parallel operation. The application text and educational graphic are independently authored; the publisher does not certify this representation."}],"related":["adjustable-ratio-transformer","winding-temperature-indicator","tap-changer-motor-protection-interface"],"artwork":"pi26-tap-change-incomplete-operation-alarm","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"substations","family":"transformer-regulation","input":"Tap command and travel status","output":"Incomplete tap-change alarm"},"plainEnglish":{"title":"What this block does","introduction":"Detects failure of a requested tap movement to achieve its defined completion feedback.","example":"In a substation, a voltage regulator can request a tap change and check the resulting tap-position feedback. A separate controller stages cooling equipment according to the transformer manufacturer's defined conditions. For this reference, the drawing identifies “Tap command and travel status” at the input and “Incomplete tap-change alarm” at the output. Alarm timing must follow the mechanism data.","drawings":"Start at the named input: Tap command and travel status. Identify its source device or document and the state represented on the drawing. Follow the named output: Incomplete tap-change alarm. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Tap command and travel status"},{"name":"Output","meaning":"Incomplete tap-change alarm"},{"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":["Tap command and travel status","TIA","Incomplete tap-change alarm"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"SEL-2414 transformer monitor","url":"https://selinc.com/products/2414/"}],"profileId":"power-installation-transformer-regulation"},"url":"https://eloragrid.ai/symbols/tap-change-incomplete-operation-alarm","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/tap-change-incomplete-operation-alarm.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pi26-transformer-control","publisher":"SEL","title":"SEL-2414 transformer monitor","url":"https://selinc.com/products/2414/","scope":"Transformer temperature, cooling, tap changing and parallel operation.","type":"manufacturer","checkedOn":"2026-11-03","reuse":"link-only","relevance":"Public technical context for transformer regulation and cooling control. Transformer temperature, cooling, tap changing and parallel operation. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}