{"schemaVersion":1,"slug":"77-telemetering-device","name":"Telemetering device","kind":"function","abbreviation":"77","aliases":["telemetry transmitter","telemetering","ANSI 77","IEEE device 77"],"category":"measurement-protection","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEEE / ANSI"],"summary":"Transmits a measured quantity from its local measurement point to a remote indication or monitoring system.","description":["Transmits a measured quantity from its local measurement point to a remote indication or monitoring system.","In a drafting package, connect this reference to the measured signal, scaling and transmission interface. The associated drawing should trace the remote receiver and monitoring point reference; the number identifies the role and does not specify the terminal arrangement, ratings or operating settings.","This designation is useful when reading machine and legacy control drawings. Retain the documented function on an existing drawing and consult the original equipment manual before assigning it to a new design."],"readingNotes":["Identify the measured signal, scaling and transmission interface.","Trace the remote receiver and monitoring point reference."],"drawingChecklist":["Label the measured signal, scaling and transmission interface.","Cross-reference the remote receiver and monitoring point reference.","Identify the device tag, manual revision and logic drawing that define this implementation."],"distinction":"Telemetering transfers measurement information; device 16 describes the communications device rather than the measurement role.","facts":[{"label":"ANSI / IEEE function number","value":"77"},{"label":"Drawing context","value":"The measured signal, scaling and transmission interface"},{"label":"Application scope","value":"Specialist or legacy machine-control use; interpret with the equipment legend."}],"references":[{"sourceId":"pub-function-abb-secogear","relevance":"Public manufacturer number/name association. Drafting explanations are independently written."},{"sourceId":"ieee-functions","relevance":"Normative device-number publication; exact edition wording and compliance require the licensed standard."}],"related":["plc-io","52-ac-circuit-breaker"],"artwork":"pub-function-box","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/protection-functions/77-telemetering-device","illustration":{"url":"https://eloragrid.ai/library/illustrations/77-telemetering-device.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pub-function-abb-secogear","title":"SecoGear medium-voltage switchgear application and technical guide, DET-882","publisher":"ABB","url":"https://library.e.abb.com/public/a06cf4cf38b34800b27bb337ab12f74f/DET-882%20SecoGear%205kV-15kV%20IEEE%20Metal%20Clad%20Switchgear_Application%20and%20installation%20guide.pdf","type":"manufacturer","scope":"Public switchgear application guide with a device-number reference table. Used to cross-check 54, 61, 62 and specialist labels. Text, photographs and manufacturer diagrams are linked only and are not redistributed.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Public manufacturer number/name association. Drafting explanations are independently written."},{"id":"ieee-functions","title":"IEEE C37.2-2022: power-system device function numbers","publisher":"IEEE","url":"https://ieeexplore.ieee.org/document/9984140","type":"standard","scope":"Device function numbers, acronyms and contact designations. The full publication may require access through IEEE.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Normative device-number publication; exact edition wording and compliance require the licensed standard."}]}