Bus
Busbar
A common conductive connection distributing power to connected circuits.
SLD / Schematic
Circuit arrangement · DSBA
Double-bus single-breaker bay arrangement
Circuit arrangement · Switchyards
An independently authored application reference. The drawing shows the named function or circuit relationship; use the project legend and selected equipment documentation for its drafting form and connections.
Browse this installation focusIn plain English
What this arrangement shows
Provides the assigned bay with selected connection paths to two buses through one circuit breaker.
A simple 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 “Two bus choices” at the input and “Selected bay bus connection” at the output. Bus selection depends on the disconnector arrangement.
What the drawings help you do
Start at the named input: Two bus choices. Identify its source device or document and the state represented on the drawing. Follow the named output: Selected bay bus connection. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Input
- Two bus choices
- Output
- Selected bay bus connection
- Application reference
- An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.
Read the source: SEL-451 protection, automation and bay control
SLD / Schematic · DSBA
What it represents
Provides the assigned bay with selected connection paths to two buses through one circuit breaker. 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 “Two bus choices” at the input and “Selected bay bus connection” at the output. Bus selection depends on the disconnector arrangement.
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.
How to read it
- Start at the named input: Two bus choices. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Selected bay bus connection. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Bus selection depends on the disconnector arrangement.
- 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.
Information to show or reference
- Label the source and connection reference for two bus choices.
- Identify the destination and defined state of selected bay bus connection.
- Record the equipment or control-document revision supporting this circuit arrangement.
- Check this application limit in the project design: Bus selection depends on the disconnector arrangement.
A distinction that matters
Bus selection depends on the disconnector arrangement. 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.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
SEL-451 protection, automation and bay control
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.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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