Implementation of a numerical distance relay for the 110kV electric lines

In this article are presented the basic principles of the numerical protections used for protecting the high-voltage electric lines (110 kV). Is achieved a study for implementing a numerical distance protection DIPA 100, for a high-voltage line (an example from practice). For the numerical relay, is shown the protection characteristic of DIPA 100, characteristics of operation to faults 'phase-phase' and characteristics of operation to faults 'phase-ground'. By using of numerical protections for the high-voltage electric lines, is ensured an easy implementation in practice and a protection qualitatively superior compared with the classic protections.