32
Directional power
A function responding to power with a specified direction and operating condition.
Protection functions
Protection functions · 32U
Underpower protection
Supervises active power below the documented operating criterion.
SLD / Schematic · 32U
What it represents
Supervises active power below the documented operating criterion.
The drafting record should connect this function to the active-power measurement circuit and operating-state supervision, then trace the underpower alarm or selected protection output. Keep the complete designation and equipment tag together so that the SLD, relay logic and terminal schedule describe the same implementation.
The cited mapping is a public manufacturer example (ABB Relion 620 function mapping). Suffixes are not universal equivalences across products, and this reference supplies neither a protection setting nor certification of the selected scheme.
How to read it
- Identify the active-power measurement circuit and operating-state supervision.
- Trace the underpower alarm or selected protection output.
Information to show or reference
- Label the active-power measurement circuit and operating-state supervision.
- Cross-reference the underpower alarm or selected protection output.
- Retain the complete suffix, selected device tag and manufacturer manual revision.
A distinction that matters
An underpower element measures power; undercurrent 37 can respond differently when voltage or power factor changes.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Relion 620 series: published protection function and designation mappings
Public primary-source function or application mapping used to identify this designation; wording and drafting notes are original.
IEEE C37.2-2022: power-system device function numbers
Device-number and suffix convention. This page is not a reproduction of the full 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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