Transformer GA
Transformer envelope
A generic transformer object for locating the equipment and its documented interfaces.
GA objects
Protection functions · 71
Level switch or relay
Signals a defined level condition in the monitored equipment.
SLD / Schematic · 71
What it represents
Signals a defined level condition in the monitored equipment.
In a drafting package, connect this reference to the level sensor location and high/low contact meaning. The associated drawing should trace the level alarm, pump control or trip destination; the number identifies the role and does not specify the terminal arrangement, ratings or operating settings.
How to read it
- Identify the level sensor location and high/low contact meaning.
- Trace the level alarm, pump control or trip destination.
Information to show or reference
- Label the level sensor location and high/low contact meaning.
- Cross-reference the level alarm, pump control or trip destination.
- Identify the device tag, manual revision and logic drawing that define this implementation.
A distinction that matters
A level switch supervises level; flow switch 80 supervises movement through a circuit.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
ANSI device-number and suffix reference table
Public manufacturer number/name association. Drafting explanations are independently written.
IEEE C37.2-2022: power-system device function numbers
Normative device-number publication; exact edition wording and compliance require the licensed standard.
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. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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