{"schemaVersion":1,"slug":"current-measurement-merging-unit-publisher","name":"Current-measurement merging-unit publisher","kind":"symbol","abbreviation":"CMP","aliases":["Digital substation process interfaces","substations Digital substation process interfaces","substations","Substations","Local current measurements","Published sampled current stream"],"category":"measurement-protection","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Publishes the assigned sampled current quantities from the selected local measurement interface.","description":["Publishes the assigned sampled current quantities from the selected local measurement interface. Digital substation interfaces carry measurements, status and control information between primary equipment and protective devices. Measurement streams, event messages and time synchronization are separate dependencies even when they share an Ethernet network.","In a digital substation bay, a merging unit digitizes local measurements and a protective relay subscribes to the assigned data stream. The command return path and communication-health indications are drawn separately. For this reference, the drawing identifies “Local current measurements” at the input and “Published sampled current stream” at the output. The stream configuration must identify its measurements.","Identify publisher, subscriber, data meaning and quality handling. Protocol labels alone do not establish protection performance, compatibility or network redundancy; these need the selected system configuration and validation. 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: Local current measurements. Identify its source device or document and the state represented on the drawing.","Follow the named output: Published sampled current stream. Cross-reference its destination and separate the command from confirmation that the equipment responded.","The stream configuration must identify its measurements.","Identify publisher, subscriber, data meaning and quality handling. Protocol labels alone do not establish protection performance, compatibility or network redundancy; these need the selected system configuration and validation."],"drawingChecklist":["Label the source and connection reference for local current measurements.","Identify the destination and defined state of published sampled current stream.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: The stream configuration must identify its measurements."],"distinction":"The stream configuration must identify its measurements. 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":"Local current measurements"},{"label":"Output / connection","value":"Published sampled current stream"},{"label":"Lookup label","value":"CMP is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-sampled-values","relevance":"Public technical context for digital substation process interfaces. Merging units, sampled measurements, GOOSE, process bus and network redundancy. The application text and educational graphic are independently authored; the publisher does not certify this representation."}],"related":["numerical-protection-relay","optical-fibre-cable","voltage-measurement-merging-unit-publisher"],"artwork":"pi26-current-measurement-merging-unit-publisher","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"substations","family":"digital-substation","input":"Local current measurements","output":"Published sampled current stream"},"plainEnglish":{"title":"What this block does","introduction":"Publishes the assigned sampled current quantities from the selected local measurement interface.","example":"In a digital substation bay, a merging unit digitizes local measurements and a protective relay subscribes to the assigned data stream. The command return path and communication-health indications are drawn separately. For this reference, the drawing identifies “Local current measurements” at the input and “Published sampled current stream” at the output. The stream configuration must identify its measurements.","drawings":"Start at the named input: Local current measurements. Identify its source device or document and the state represented on the drawing. Follow the named output: Published sampled current stream. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Local current measurements"},{"name":"Output","meaning":"Published sampled current stream"},{"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":["Local current measurements","CMP","Published sampled current stream"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"Digital secondary systems: Sampled Values","url":"https://selinc.com/solutions/digital-secondary-systems/sampled-values/"}],"profileId":"power-installation-digital-substation"},"url":"https://eloragrid.ai/symbols/current-measurement-merging-unit-publisher","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/current-measurement-merging-unit-publisher.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pi26-sampled-values","publisher":"SEL","title":"Digital secondary systems: Sampled Values","url":"https://selinc.com/solutions/digital-secondary-systems/sampled-values/","scope":"Merging units, sampled measurements, GOOSE, process bus and network redundancy.","type":"manufacturer","checkedOn":"2026-11-03","reuse":"link-only","relevance":"Public technical context for digital substation process interfaces. Merging units, sampled measurements, GOOSE, process bus and network redundancy. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}