VT / PT
Voltage transformer
A transformer providing a voltage signal for metering or protection.
SLD / Schematic
Protection functions · 60
Voltage or current balance relay
Compares related measured circuits or quantities to detect an abnormal imbalance.
SLD / Schematic · 60
What it represents
Compares related measured circuits or quantities to detect an abnormal imbalance.
In a drafting package, connect this reference to the compared voltage or current circuits. The associated drawing should trace the balance alarm and any blocked protection functions; the number identifies the role and does not specify the terminal arrangement, ratings or operating settings.
How to read it
- Identify the compared voltage or current circuits.
- Trace the balance alarm and any blocked protection functions.
Information to show or reference
- Label the compared voltage or current circuits.
- Cross-reference the balance alarm and any blocked protection functions.
- Identify the device tag, manual revision and logic drawing that define this implementation.
A distinction that matters
A 60 label may denote loss-of-potential supervision in a modern relay; it is not universally a complete VT fuse-failure scheme.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
SecoGear medium-voltage switchgear application and technical guide, DET-882
Public manufacturer number/name association. Drafting explanations are independently written.
IEEE C37.2-2022: power-system device function numbers
Normative device-number publication; exact edition wording and compliance require the 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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