TX
Power transformer
Equipment transferring electrical power between winding circuits.
SLD / Schematic
Functional block · CCYAR
Combined CT-VT yard application reference
Functional block · Switchyards
An independently authored application reference. The drawing shows the named function or circuit relationship; use the project legend and selected equipment documentation for its drafting form and connections.
Browse this installation focusIn plain English
What this block does
Groups the current and voltage measurement roles of the selected combined instrument transformer.
A simple example
In a switchyard equipment diagram, the primary reference identifies the electrical role of an installed component while the linked equipment schedule and manufacturer drawing supply its exact construction and dimensions. For this reference, the drawing identifies “Primary current and voltage” at the input and “Assigned secondary measurement circuits” at the output. Each measuring function has its own characteristics.
What the drawings help you do
Start at the named input: Primary current and voltage. Identify its source device or document and the state represented on the drawing. Follow the named output: Assigned secondary measurement circuits. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Input
- Primary current and voltage
- Output
- Assigned secondary measurement circuits
- Application reference
- An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.
Read the source: Gas-insulated switchgear
Schematic · CCYAR
What it represents
Groups the current and voltage measurement roles of the selected combined instrument transformer. High-voltage primary equipment carries, interrupts, measures or conditions the main power circuit. Its function, insulation arrangement and equipment boundaries need to be distinguished from the secondary signals used to control it.
In a switchyard equipment diagram, the primary reference identifies the electrical role of an installed component while the linked equipment schedule and manufacturer drawing supply its exact construction and dimensions. For this reference, the drawing identifies “Primary current and voltage” at the input and “Assigned secondary measurement circuits” at the output. Each measuring function has its own characteristics.
Read the connected power path before interpreting a secondary output or alarm. These original educational component references provide no product dimensions, dielectric rating, installation clearance or construction approval. The functional block is an independent explanation of this named application. Equipment-specific ratings, terminal connections and operating conditions must be established in the project documentation.
How to read it
- Start at the named input: Primary current and voltage. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Assigned secondary measurement circuits. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Each measuring function has its own characteristics.
- Read the connected power path before interpreting a secondary output or alarm. These original educational component references provide no product dimensions, dielectric rating, installation clearance or construction approval.
Information to show or reference
- Label the source and connection reference for primary current and voltage.
- Identify the destination and defined state of assigned secondary measurement circuits.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: Each measuring function has its own characteristics.
A distinction that matters
Each measuring function has its own characteristics. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Gas-insulated switchgear
Public technical context for high-voltage primary equipment references. Primary switching equipment and instrument-transformer interfaces. The application text and educational graphic are independently authored; the publisher does not certify this representation.
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. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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Put the reference into a drawing workflow.
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