TX ADJ
Adjustable-ratio transformer
An adjustable-ratio transformer includes a documented means of varying its voltage ratio.
SLD / Schematic
Functional block · TOF
Tap-changer operation-complete feedback
Functional block · Substations
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.
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What this block does
Confirms completion of the defined tap-changing operation at the regulator interface.
A simple example
In a substation, a voltage regulator can request a tap change and check the resulting tap-position feedback. A separate controller stages cooling equipment according to the transformer manufacturer's defined conditions. For this reference, the drawing identifies “Completed-position feedback” at the input and “Tap-change completion status” at the output. Completion indication must use the actual mechanism signals.
What the drawings help you do
Start at the named input: Completed-position feedback. Identify its source device or document and the state represented on the drawing. Follow the named output: Tap-change completion status. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Input
- Completed-position feedback
- Output
- Tap-change completion status
- 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-2414 transformer monitor
Schematic · TOF
What it represents
Confirms completion of the defined tap-changing operation at the regulator interface. Transformer regulation changes the selected winding connection to influence voltage, while cooling control manages the installed fans and pumps. Commands, mechanical position and measured results belong to different parts of the diagram.
In a substation, a voltage regulator can request a tap change and check the resulting tap-position feedback. A separate controller stages cooling equipment according to the transformer manufacturer's defined conditions. For this reference, the drawing identifies “Completed-position feedback” at the input and “Tap-change completion status” at the output. Completion indication must use the actual mechanism signals.
Keep tap-change permission, limit contacts, movement indication and measured voltage distinct. Actual tap positions, time delays, cooling ratings and allowable parallel operation require the selected transformer control design. 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.
How to read it
- Start at the named input: Completed-position feedback. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Tap-change completion status. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Completion indication must use the actual mechanism signals.
- Keep tap-change permission, limit contacts, movement indication and measured voltage distinct. Actual tap positions, time delays, cooling ratings and allowable parallel operation require the selected transformer control design.
Information to show or reference
- Label the source and connection reference for completed-position feedback.
- Identify the destination and defined state of tap-change completion status.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: Completion indication must use the actual mechanism signals.
A distinction that matters
Completion indication must use the actual mechanism signals. 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-2414 transformer monitor
Public technical context for transformer regulation and cooling control. Transformer temperature, cooling, tap changing and parallel operation. 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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