Window space factor is defined as the ratio of copper area in the window to the area of the window.

**Space factor:**

**Window
space factor ****K _{w}**

**Window space factor is defined as
the ratio of copper area in the window to the area of the window. **

For a given window area, as the
voltage rating of the transformer increases, quantity of insulation in the
window increases, area of copper reduces. Thus the window space factor reduces
as the voltage increases.

It depends upon the relative amounts
of insulation and copper provided, which in turn depends upon the voltage
rating and output o transformers. The following empirical formulae may be used
for estimating the value of window space factor:

**K _{w}
= 10/(30+kV)**

Where kV is the voltage of h.v.
winding in kilo-volt. The above formula is for transformers of rating between
50 to 200 kVA.

Space factor is larger for large outputs
and smaller outputs. For a transformer of about 1000 kVA rating K_{w} =
12/(30+kV) and for transformers of about 20 kVA rating K_{w} = 8/(30 +
kV). The values of space actor for intermediate rating can be interpolated.

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Design of Electrical Machines : Introduction : Window space factor Kw |

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