{"schemaVersion":1,"slug":"voltage-regulator-deadband-comparator","name":"Voltage-regulator deadband comparator","kind":"symbol","abbreviation":"VDC","aliases":["Transformer regulation and cooling control","substations Transformer regulation and cooling control","substations","Substations","Measured and target voltage","Regulation demand state"],"category":"measurement-protection","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Identifies the measured-voltage interval within which the regulator makes no tap-change request.","description":["Identifies the measured-voltage interval within which the regulator makes no tap-change request. 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 “Measured and target voltage” at the input and “Regulation demand state” at the output. Deadband is a control setting rather than a symbol property.","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: Measured and target voltage. Identify its source device or document and the state represented on the drawing.","Follow the named output: Regulation demand state. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Deadband is a control setting rather than a symbol property.","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 measured and target voltage.","Identify the destination and defined state of regulation demand state.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Deadband is a control setting rather than a symbol property."],"distinction":"Deadband is a control setting rather than a symbol property. 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":"Measured and target voltage"},{"label":"Output / connection","value":"Regulation demand state"},{"label":"Lookup label","value":"VDC 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","voltage-regulator-line-drop-compensation-interface"],"artwork":"pi26-voltage-regulator-deadband-comparator","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"substations","family":"transformer-regulation","input":"Measured and target voltage","output":"Regulation demand state"},"plainEnglish":{"title":"What this block does","introduction":"Identifies the measured-voltage interval within which the regulator makes no tap-change request.","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 “Measured and target voltage” at the input and “Regulation demand state” at the output. Deadband is a control setting rather than a symbol property.","drawings":"Start at the named input: Measured and target voltage. Identify its source device or document and the state represented on the drawing. Follow the named output: Regulation demand state. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Measured and target voltage"},{"name":"Output","meaning":"Regulation demand state"},{"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":["Measured and target voltage","VDC","Regulation demand state"],"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/voltage-regulator-deadband-comparator","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/voltage-regulator-deadband-comparator.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."}]}