32
Directional power
A function responding to power with a specified direction and operating condition.
Protection functions
Protection functions · 67
Directional overcurrent
An overcurrent function with a documented direction criterion.
SLD / Schematic · 67
What it represents
Directional overcurrent combines an overcurrent operating condition with a direction criterion defined by the device and application. Its full name and suffix can distinguish phase and earth-fault implementations, measurement inputs and operating stages.
On a power drawing, keep this function reference connected to the selected equipment and its complete designation. A multifunction relay can implement several numbered functions. This entry explains the reference; it supplies no settings or commissioning procedure.
How to read it
- Identify the current input and the documented direction reference.
- Follow the forward/reverse convention used in the protection scheme.
Information to show or reference
- Reference all required measurement inputs.
- State the direction convention.
- Identify the relay element and associated trip logic.
A distinction that matters
A 67 reference is not the same as directional power 32. Their quantities and operating criteria differ.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Public reference table of ANSI device-function numbers
Public manufacturer table used to check the base function-number name.
IEEE C37.2-2022: power-system device function numbers
Normative publication reference for the device-function convention.
Relion 620: functions, codes and symbols
Public examples of manufacturer-specific function names and suffixes.
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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