# Combined CT-VT yard application reference

Canonical URL: https://eloragrid.ai/symbols/combined-ct-vt-yard-application-reference
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: CCYAR
Drawing use: Schematic
Reference families: Manufacturer

Representation: Functional block
Installation focus: switchyards
Input: Primary current and voltage
Output: Assigned secondary measurement circuits

Groups the current and voltage measurement roles of the selected combined instrument transformer.

## In 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.

### Terms

- 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.

Concept diagram: Primary current and voltage → CCYAR → Assigned secondary measurement circuits
A reading guide. The entry's original illustration and input/output facts describe this application.

- [Gas-insulated switchgear](https://www.hitachienergy.com/products-and-solutions/high-voltage-switchgear-and-breakers/gas-insulated-switchgear)


## 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.

## Important distinction

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.

## Facts

- Representation: Functional block
- Installation focus: Switchyards
- Input / boundary: Primary current and voltage
- Output / connection: Assigned secondary measurement circuits
- Lookup label: CCYAR is a library lookup label, not a standard device designation.

## Public references

- [Gas-insulated switchgear](https://www.hitachienergy.com/products-and-solutions/high-voltage-switchgear-and-breakers/gas-insulated-switchgear) — Hitachi Energy. 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.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.