59
Overvoltage
A function responding to voltage above its configured operating criteria.
Protection functions
Protection functions · 59N
Residual or neutral overvoltage
Supervises a residual or neutral voltage used by the selected earth-fault or neutral-displacement scheme.
SLD / Schematic · 59N
What it represents
Supervises a residual or neutral voltage used by the selected earth-fault or neutral-displacement scheme.
The drafting record should connect this function to the broken-delta VT, neutral VT or calculated residual-voltage source, then trace the neutral-displacement alarm or earth-fault trip. 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 (SEL public device-number table). 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 broken-delta VT, neutral VT or calculated residual-voltage source.
- Trace the neutral-displacement alarm or earth-fault trip.
Information to show or reference
- Label the broken-delta VT, neutral VT or calculated residual-voltage source.
- Cross-reference the neutral-displacement alarm or earth-fault trip.
- Retain the complete suffix, selected device tag and manufacturer manual revision.
A distinction that matters
A residual-voltage function is not ordinary phase overvoltage; source and scaling depend on the VT arrangement.
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 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.
Explore related references
Put the reference into a drawing workflow.
Elora Grid helps electrical teams work with drawings, specifications and equipment information. Explore the drafting workflow or join the early-access waitlist.