TX
Power transformer
Equipment transferring electrical power between winding circuits.
SLD / Schematic
Protection functions · 90
Regulating device
Adjusts equipment to maintain the controlled electrical or operating quantity.
SLD / Schematic · 90
What it represents
Adjusts equipment to maintain the controlled electrical or operating quantity.
In a drafting package, connect this reference to the reference value, feedback measurement and control mode. The associated drawing should trace the regulating actuator, excitation or tap-changing interface; the number identifies the role and does not specify the terminal arrangement, ratings or operating settings.
How to read it
- Identify the reference value, feedback measurement and control mode.
- Trace the regulating actuator, excitation or tap-changing interface.
Information to show or reference
- Label the reference value, feedback measurement and control mode.
- Cross-reference the regulating actuator, excitation or tap-changing interface.
- Identify the device tag, manual revision and logic drawing that define this implementation.
A distinction that matters
Device 90 is a general regulating role; identify whether this instance controls voltage, taps or another quantity.
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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