# Why to use 50 or 60 Hz instead of other Higher or Lower frequencies (5 Hz or 1000 Hz)

Our electrical power systems utilize the 50/60 Hz frequency range as the standard. Today you’ll learn why not to use small frequencies such as 5 or 10 Hz or large frequencies such as 500 Hz, 1000 Hz or 5000 Hz.

Let’s roll in:

List of Contents

### Why not Use high frequencies

#### Power handling capability is reduced

The power handling capability of any system is inversely related to its frequency by the following relationship:

P = (v*. v’ sin 𝜹) / (2*𝜋 f l)

At higher frequency, the power handling capability decreases.

#### Ferranti effect

Ferranti effect is directly proportional to the square of the frequency. The higher the frequency the more prominent is the Ferranti effect.

#### Speed of alternator

The speed of alternator is directly correlated with the operating frequency of power system. For higher frequency, the speed of alternator should be increased which leads to overall instability of the system.

### Why not use lower frequencies

#### Flickering of lamps

A 50/60 Hz wave covers 50/60 cycles per second. At such rate, the flickering of lighting equipment is not prominent. It appears a regular continuous wave to the normal eye. At a lower frequency of 5 or 10 Hz, the flickering of equipment becomes noticeable which is not desirable.

#### Transformer size

The frequency of magnetic core is inversely related to the flux. The flux is directly proportional the amount of steel in the core. Thus the size of the transformer is inversely related to the frequency.

So that was all about it.

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