A "V connected transformer" typically refers to a specific configuration of transformer windings used in railway traction systems. In railway electrification, transformers play a crucial role in converting high voltage AC (alternating current) from the grid to the appropriate voltage levels required by the trains.

Here's what the "V connected" configuration generally entails:

1. Primary Windings: In a V connection, the primary windings of the transformer are connected in a V shape. This means that the primary windings are not directly connected in series or parallel, but rather in a configuration that allows for certain advantages in terms of voltage transformation and current distribution.
2. Voltage Transformation: The V connection allows the transformer to step up or step down the voltage efficiently. For railway applications, this is important because the voltage from the grid (typically at a high voltage level) needs to be stepped down to the operational voltage required by the trains.
3. Current Distribution: The V connection can also help in balancing the load across the transformer windings, ensuring that current is distributed evenly and efficiently. This is crucial in railway systems where large amounts of power are required to propel trains.
4. Efficiency and Design: V connection transformers are designed to be efficient and reliable, considering the demanding operational conditions of railway electrification systems. They are engineered to handle high currents and varying loads effectively.

In summary, a V connected transformer in railway applications refers to a specific winding configuration that optimizes voltage transformation and current distribution for powering electric trains. It plays a critical role in converting high voltage AC from the grid into usable power for traction motors, ensuring efficient and reliable operation of the railway electrification system.