# Zigzag-Delta-Wye Transformer

Linear, non-ideal zigzag-delta-wye transformer with three-limb core with saturation capability

**Library:**Simscape / Electrical / Passive / Transformers

## Description

The Zigzag-Delta-Wye Transformer block models a linear,
nonideal transformer with a three-limb core that has primary zigzag windings and
secondary delta, wye, or delta and wye windings. You can specify the phase offset
between the zigzag and wye windings using the **Wye secondary phase
shift** parameter and parameterize the block impedance using per-unit
values. The block includes effects for linear winding leakage and linear core
magnetization.

The configuration options for the delta winding types are:

Delta 1 o'clock — Mesh configuration with a lagging 30-degree phase shift relative to the voltage of a connected wye configuration

Delta 11 o'clock — Mesh configuration with leading 30-degree phase shift relative to the voltage of a connected wye configuration

These equivalent circuit diagrams show the zigzag-delta-wye transformer in the delta 1 o'clock and delta 11 o'clock configurations, respectively.

In these diagrams:

*R*is the primary winding resistance._{w1}*L*is the primary leakage reactance._{l1}*R*is the delta secondary winding resistance._{w2}*L*is the delta secondary leakage reactance._{l2}*R*is the wye secondary winding resistance._{w3}*L*is the wye secondary leakage reactance._{l3}*R*is the shunt magnetizing resistance._{m}*L*is the shunt magnetizing reactance._{m}

### Variables

Use the **Variables** settings to specify the priority and
initial target values for the block variables before simulation. For more
information, see Set Priority and Initial Target for Block Variables.

To enable the **Wye secondary currents** variable, set
**Secondary connection** to `Wye`

or
`Wye and Delta`

.

To enable the **Delta secondary currents** variable, set
**Secondary connection** to `Delta`

or
`Wye and Delta`

.

## Ports

### Conserving

## Parameters

## Extended Capabilities

## Version History

**Introduced in R2019b**