{"schemaVersion":1,"slug":"transformer-moisture-monitor-interface","name":"Transformer moisture-monitor interface","kind":"symbol","abbreviation":"TMI","aliases":["Transformer protection and monitoring interfaces","substations Transformer protection and monitoring interfaces","substations","Substations","Moisture-monitor output","Moisture condition information"],"category":"measurement-protection","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Identifies the measurement path from the installed oil or insulation moisture monitor.","description":["Identifies the measurement path from the installed oil or insulation moisture monitor. Transformer monitoring interfaces connect physical sensors and protection calculations to the station's alarms and trip logic. Temperature, oil, gas, pressure and electrical measurements indicate different conditions and require separate interpretation.","In a substation transformer bay, a protection panel receives winding-current measurements and equipment alarm contacts. An operator can then distinguish an electrical protection operation from a cooling-system or physical-condition alarm. For this reference, the drawing identifies “Moisture-monitor output” at the input and “Moisture condition information” at the output. Measurement location and temperature affect interpretation.","Identify the sensor or calculation, its monitored zone and its assigned response. Alarm and trip thresholds, sensor fitting and protection settings belong to the selected transformer documentation and the approved protection 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: Moisture-monitor output. Identify its source device or document and the state represented on the drawing.","Follow the named output: Moisture condition information. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Measurement location and temperature affect interpretation.","Identify the sensor or calculation, its monitored zone and its assigned response. Alarm and trip thresholds, sensor fitting and protection settings belong to the selected transformer documentation and the approved protection design."],"drawingChecklist":["Label the source and connection reference for moisture-monitor output.","Identify the destination and defined state of moisture condition information.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Measurement location and temperature affect interpretation."],"distinction":"Measurement location and temperature affect interpretation. 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":"Moisture-monitor output"},{"label":"Output / connection","value":"Moisture condition information"},{"label":"Lookup label","value":"TMI is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-transformer-relay","relevance":"Public technical context for transformer protection and monitoring interfaces. Transformer protection, monitoring and measurement interfaces. The application text and educational graphic are independently authored; the publisher does not certify this representation."}],"related":["power-transformer","87t-transformer-differential-protection","transformer-protection-lockout-distribution"],"artwork":"pi26-transformer-moisture-monitor-interface","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"substations","family":"transformer-monitoring","input":"Moisture-monitor output","output":"Moisture condition information"},"plainEnglish":{"title":"What this block does","introduction":"Identifies the measurement path from the installed oil or insulation moisture monitor.","example":"In a substation transformer bay, a protection panel receives winding-current measurements and equipment alarm contacts. An operator can then distinguish an electrical protection operation from a cooling-system or physical-condition alarm. For this reference, the drawing identifies “Moisture-monitor output” at the input and “Moisture condition information” at the output. Measurement location and temperature affect interpretation.","drawings":"Start at the named input: Moisture-monitor output. Identify its source device or document and the state represented on the drawing. Follow the named output: Moisture condition information. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Moisture-monitor output"},{"name":"Output","meaning":"Moisture condition information"},{"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":["Moisture-monitor output","TMI","Moisture condition information"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"SEL-487E transformer protection relay","url":"https://selinc.com/products/487E/"}],"profileId":"power-installation-transformer-monitoring"},"url":"https://eloragrid.ai/symbols/transformer-moisture-monitor-interface","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/transformer-moisture-monitor-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-relay","publisher":"SEL","title":"SEL-487E transformer protection relay","url":"https://selinc.com/products/487E/","scope":"Transformer protection, monitoring and measurement interfaces.","type":"manufacturer","checkedOn":"2026-11-03","reuse":"link-only","relevance":"Public technical context for transformer protection and monitoring interfaces. Transformer protection, monitoring and measurement interfaces. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}