{"schemaVersion":1,"slug":"tap-changer-motor-protection-interface","name":"Tap-changer motor-protection interface","kind":"symbol","abbreviation":"TMI","aliases":["Transformer regulation and cooling control","substations Transformer regulation and cooling control","substations","Substations","Drive protective-device contact","Tap-drive fault input"],"category":"measurement-protection","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Reports the assigned tap-drive motor protective-device operation.","description":["Reports the assigned tap-drive motor protective-device operation. 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 “Drive protective-device contact” at the input and “Tap-drive fault input” at the output. A motor fault differs from a regulator fault.","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: Drive protective-device contact. Identify its source device or document and the state represented on the drawing.","Follow the named output: Tap-drive fault input. Cross-reference its destination and separate the command from confirmation that the equipment responded.","A motor fault differs from a regulator fault.","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 drive protective-device contact.","Identify the destination and defined state of tap-drive fault input.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: A motor fault differs from a regulator fault."],"distinction":"A motor fault differs from a regulator fault. 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":"Drive protective-device contact"},{"label":"Output / connection","value":"Tap-drive fault input"},{"label":"Lookup label","value":"TMI 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","automatic-voltage-regulator-enable"],"artwork":"pi26-tap-changer-motor-protection-interface","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"substations","family":"transformer-regulation","input":"Drive protective-device contact","output":"Tap-drive fault input"},"plainEnglish":{"title":"What this block does","introduction":"Reports the assigned tap-drive motor protective-device operation.","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 “Drive protective-device contact” at the input and “Tap-drive fault input” at the output. A motor fault differs from a regulator fault.","drawings":"Start at the named input: Drive protective-device contact. Identify its source device or document and the state represented on the drawing. Follow the named output: Tap-drive fault input. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Drive protective-device contact"},{"name":"Output","meaning":"Tap-drive fault 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":["Drive protective-device contact","TMI","Tap-drive fault input"],"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-changer-motor-protection-interface","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/tap-changer-motor-protection-interface.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."}]}