{"schemaVersion":1,"slug":"bus-section-disconnector-arrangement","name":"Bus-section disconnector arrangement","kind":"symbol","abbreviation":"BDA","aliases":["Switchyard busbar arrangements","switchyards Switchyard busbar arrangements","switchyards","Switchyards","Adjacent bus conductors","Section isolation boundary"],"category":"power-distribution","drawingTypes":["SLD","Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Identifies the isolating connection separating the assigned bus conductor sections.","description":["Identifies the isolating connection separating the assigned bus conductor sections. A busbar arrangement defines the available paths between incoming circuits, outgoing circuits and bus sections. Its switching devices and measurement boundaries determine how a circuit can remain connected when part of the installation is unavailable.","In a switchyard, a single-line arrangement helps identify the bay connections, tie devices and possible alternate supply paths. Normal open points must remain separate from the equipment's physical ability to close. For this reference, the drawing identifies “Adjacent bus conductors” at the input and “Section isolation boundary” at the output. The disconnector duty must be separately specified.","Name each bus, bay and switching device. The arrangement illustrates electrical connectivity; reliability, fault levels, permitted switching and protection coordination require the actual network design. The circuit arrangement 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: Adjacent bus conductors. Identify its source device or document and the state represented on the drawing.","Follow the named output: Section isolation boundary. Cross-reference its destination and separate the command from confirmation that the equipment responded.","The disconnector duty must be separately specified.","Name each bus, bay and switching device. The arrangement illustrates electrical connectivity; reliability, fault levels, permitted switching and protection coordination require the actual network design."],"drawingChecklist":["Label the source and connection reference for adjacent bus conductors.","Identify the destination and defined state of section isolation boundary.","Record the equipment or control-document revision supporting this circuit arrangement.","Check this application limit in the project design: The disconnector duty must be separately specified."],"distinction":"The disconnector duty must be separately specified. 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":"Circuit arrangement"},{"label":"Installation focus","value":"Switchyards"},{"label":"Input / boundary","value":"Adjacent bus conductors"},{"label":"Output / connection","value":"Section isolation boundary"},{"label":"Lookup label","value":"BDA is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-bus-schemes","relevance":"Public technical context for switchyard busbar arrangements. Bus arrangements, breaker control and bay-level coordination. The application text and educational graphic are independently authored; the publisher does not certify this representation."}],"related":["busbar","disconnector","bus-transfer-bypass-arrangement"],"artwork":"pi26-bus-section-disconnector-arrangement","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"circuit-arrangement","focus":"switchyards","family":"yard-buses","input":"Adjacent bus conductors","output":"Section isolation boundary"},"plainEnglish":{"title":"What this arrangement shows","introduction":"Identifies the isolating connection separating the assigned bus conductor sections.","example":"In a switchyard, a single-line arrangement helps identify the bay connections, tie devices and possible alternate supply paths. Normal open points must remain separate from the equipment's physical ability to close. For this reference, the drawing identifies “Adjacent bus conductors” at the input and “Section isolation boundary” at the output. The disconnector duty must be separately specified.","drawings":"Start at the named input: Adjacent bus conductors. Identify its source device or document and the state represented on the drawing. Follow the named output: Section isolation boundary. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Adjacent bus conductors"},{"name":"Output","meaning":"Section isolation boundary"},{"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":["Adjacent bus conductors","BDA","Section isolation boundary"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"SEL-451 protection, automation and bay control","url":"https://selinc.com/products/451/"}],"profileId":"power-installation-yard-buses"},"url":"https://eloragrid.ai/symbols/bus-section-disconnector-arrangement","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/bus-section-disconnector-arrangement.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pi26-bus-schemes","publisher":"SEL","title":"SEL-451 protection, automation and bay control","url":"https://selinc.com/products/451/","scope":"Bus arrangements, breaker control and bay-level coordination.","type":"manufacturer","checkedOn":"2026-11-03","reuse":"link-only","relevance":"Public technical context for switchyard busbar arrangements. Bus arrangements, breaker control and bay-level coordination. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}