Electrical Three phase power | Wye Delta configuration

Three phase power | Wye Delta configuration

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Three phase power


Kind of electricity we use in our home or office is single phase power. Because of single alternating current and voltage wave, the line is called single phase connection. But for heavy loads like powering industrial motor single phase is not enough. So here comes the polyphase system. In this system, three phase power is most common, although for certain purpose, greater number of phase is also used. For example, almost all mercury-arc rectifiers for power purposes are either 6-phase or 12-phase and most of the rotary converters in use are six phase. To utilize three phase power in industrial devices, wye delta configuration is necessary.

All modern generators are practically three-phase. It is because three phase is easily capable of transmitting large amount of power. The reason for the immense popularity of three-phase mechanism are that, (1). it is more efficient. (2). it uses less material for given capacity. (3). it costs less than single-phase apparatus.

For better understanding of how three phase electricity work you can consider this video…

Wye Delta Configuration


To operate three phase AC supply we need Wye-delta configuration in our devices. To learn more about Y-Delta configuration this video could be very helpful…

In this lesson, we will now discuss wye-delta conversion for circuit analysis…

Wye Delta Conversion


A delta configuration is look like this. In a circuit combination, it may appear like in the Figure right.Delta Configuration

Figure below is a Wye configuration. It also called star connection or star configuration. In a circuit combination, it can also appear as shown in the figure right.

Star or Wye configuration

Delta to Wye conversion


In circuit analysis, to make our task simple we need to convert wye delta configuration. Following some easy steps we can convert our configuration: 

Take the delta config then draw a Y shape in it.
Denote the subsequent resister in Y, R_{x}, R_{y} and R_{z}

In Delta, R_{1}, R_{2}, R_{3} is our known resister. we have to find out R_{x}, R_{y} and R_{z} for Wye.

So the equivalent Y configuration will have resistance R_{x}, R_{y} and R_{z}

Wye to Delta Conversion


For Wye to Delta conversion, take the Y and place it into Delta as in the figurewye to delta convertion

now we need to find out equivalent R_{1}, R_{2}, R_{3} for Y R_{x}, R_{y} and R_{z}.

wye to delta conversion equation

Next we will see circuit analysis method using wye-delta conversion.

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