Tap-position coded-input decoder

What it represents

Converts the installed tap-position contact code into the controller's displayed position. 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 “Tap contact code” at the input and “Decoded tap position” at the output. Invalid codes require explicit handling.

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: Tap contact code. Identify its source device or document and the state represented on the drawing.
• Follow the named output: Decoded tap position. Cross-reference its destination and separate the command from confirmation that the equipment responded.
• Invalid codes require explicit handling.
• 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 tap contact code.
• Identify the destination and defined state of decoded tap position.
• Record the equipment or control-document revision supporting this functional block.
• Check this application limit in the project design: Invalid codes require explicit handling.

Sources you can follow

These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.

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.