VT / PT
Voltage transformer
A transformer providing a voltage signal for metering or protection.
SLD / Schematic
Symbols · VT
Voltage transformer with two secondary windings
VT with two separate secondary windings, typically one for metering and one for protection, each with its own fusing.
In plain English
What does Voltage transformer with two secondary windings mean?
This VT form has one primary and two secondary windings. The usual arrangement gives a metering winding with a high accuracy class and a protection winding, each fused or protected by an MCB separately so a fault on one circuit does not take out the other.
A simple example
Both windings share the same core, so their combined burden must stay within the VT's thermal rating. The symbol shows the two windings but not the class of each or the secondary protection, which must be stated for each circuit.
What the drawings help you do
Read the class and burden of each winding. Find the separate secondary protection for each winding. A VT with two secondaries shares one core; two separate VTs give independent cores.
This particular reference
VT with two separate secondary windings, typically one for metering and one for protection, each with its own fusing. A VT with two secondaries shares one core; two separate VTs give independent cores.
- Winding
- A coil of conductor inside an electrical machine or transformer.
- Rating
- A value stating the conditions for which equipment is specified.
- Schematic
- A drawing showing function and connections rather than physical appearance.
Read the source: Indoor current and voltage transformers · Power, potential and autotransformer symbols
SLD / Schematic · VT
What it represents
This VT form has one primary and two secondary windings. The usual arrangement gives a metering winding with a high accuracy class and a protection winding, each fused or protected by an MCB separately so a fault on one circuit does not take out the other.
Both windings share the same core, so their combined burden must stay within the VT's thermal rating. The symbol shows the two windings but not the class of each or the secondary protection, which must be stated for each circuit.
How to read it
- Read the class and burden of each winding.
- Find the separate secondary protection for each winding.
Information to show or reference
- State class per winding
- Show secondary fusing per winding
- Reference earthing point
A distinction that matters
A VT with two secondaries shares one core; two separate VTs give independent cores.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Indoor current and voltage transformers
Public manufacturer overview of indoor current and voltage instrument transformers.
Power, potential and autotransformer symbols
Public potential-transformer symbol family used for context.
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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SLD / Schematic
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SLD / Schematic
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