# Tap-position analogue-input interface

Canonical URL: https://eloragrid.ai/symbols/tap-position-analogue-input-interface
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: TAI
Drawing use: Schematic
Reference families: Manufacturer

Representation: Functional block
Installation focus: substations
Input: Position transmitter signal
Output: Measured tap-position input

Identifies an analogue position signal supplied by the selected tap-position transmitter.

## In plain English

### What this block does

Identifies an analogue position signal supplied by the selected tap-position transmitter.

### 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 “Position transmitter signal” at the input and “Measured tap-position input” at the output. Signal scaling follows the actual transmitter.

### What the drawings help you do

Start at the named input: Position transmitter signal. Identify its source device or document and the state represented on the drawing. Follow the named output: Measured tap-position input. Cross-reference its destination and separate the command from confirmation that the equipment responded.

### Terms

- Input: Position transmitter signal
- Output: Measured tap-position input
- Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.

Concept diagram: Position transmitter signal → TAI → Measured tap-position input
A reading guide. The entry's original illustration and input/output facts describe this application.

- [SEL-2414 transformer monitor](https://selinc.com/products/2414/)


## What it represents

Identifies an analogue position signal supplied by the selected tap-position transmitter. 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 “Position transmitter signal” at the input and “Measured tap-position input” at the output. Signal scaling follows the actual transmitter.
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: Position transmitter signal. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Measured tap-position input. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Signal scaling follows the actual transmitter.
- 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 position transmitter signal.
- Identify the destination and defined state of measured tap-position input.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: Signal scaling follows the actual transmitter.

## Important distinction

Signal scaling follows the actual transmitter. 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

- Representation: Functional block
- Installation focus: Substations
- Input / boundary: Position transmitter signal
- Output / connection: Measured tap-position input
- Lookup label: TAI is a library lookup label, not a standard device designation.

## Public references

- [SEL-2414 transformer monitor](https://selinc.com/products/2414/) — SEL. 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.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.