Symmetric components are very important quantities used in the implementation of relay protection and automation algorithms. Symmetrical components allow for more sensitive defenses.

# Category: Symmetrical components

The method of symmetrical components in relay protection, calculation of direct, reverse and zero sequence parameters, complex equivalent circuits, modeling of short circuit and open circuit modes.

## The essence of the method of symmetrical components in three sentences

Physically symmetric components in electrical circuits do not exist. Symmetric components were introduced to significantly simplify the calculation of three-phase circuits due to the fact that the mathematically asymmetric system of three arbitrary vectors can always be replaced by two symmetric systems of vectors and one system of three co-directional vectors (Fig. 1).

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