## What as a Vector Diagram?

A **vector diagram** is a diagram on which one or more vectors can be represented. On a vector diagram, alternating quantities are represented by an arrow. The length of the arrow represents the

## Transformer Vector Diagram

Three phase electrical quantities can be represented by a vector diagram. Vector diagrams which represent three-phase quantities are known as three-phase vector diagrams.

A **transformer three-phase vector diagram** is required for determining the fault calculation of an electrical power system. Practically, almost every electrical power system deals with

Three-phase vector diagrams are commonly used to represent 3 phase transformers are known as **transformer vector diagrams**.

The voltages of a three phase system is shown in the figure below:

The phase sequence of the vectors, representing voltages, is shown in the figure by an arrow. The term phase sequence is used to indicate the order in which vectors are placed in relation to one another for counter-clockwise rotation. In the figure above three phase-to-neutral voltages are rotating.

This means they would reach their maximum positive values in the sequence first R, then Y and then B. This sequence is referred to as a positive sequence. This represents the normal healthy condition of the system. You can learn more about vector diagrams and transformers by studying our electrical MCQs.