Event under the auspices of the Ministry of Economy of Slovak Republic

Digital overcurrent relays in industrial networks - Advanced fetures for optimization of tripping times

Marek Höger
Department of Power Electrical Systems, Faculty of Electrica

*Marek Baňas
Department of Power Electrical Systems, Faculty of Electrical Engineering, University of Zilina

Juraj Altus
Department of Power Electrical Systems, Faculty of Electrical Engineering, University of Zilina


     Last modified: 2017-06-12

Abstract
The paper will discuss the possible use of advanced features of modern directional over current protection terminals in industrial networks to reduce tripping times and enhance the selectivity of tripping. One of these features is directional comparison function and consequently the possibility of creating selective sections with the backup.
The main reason for tripping time optimization and selective sections creation is the fact, that there is a significant increase of short circuit power in these networks, due to increasing number of local generators, increasing of transformation capacity from the distribution grid and due to changes on the distribution and transmission system level. Decreasing of tripping times reduces the stress of high voltage equipment during faults, improves the reliability of the local distribution system and prolongs life time of equipment.
This paper will introduce and discuss several possible protection schemes for a given industrial network with local generation:
- use of non-directional definite time over current protections,
- use of directional definite time over current protections,
- use of directional definite time over current protections with directional comparison,
- use of directional definite time over current protections with directional comparison and tripping time optimization.
For each scenario, a simulation was performed in Neplan. Results have confirmed, that protection schemes with use of directional comparison function can achieve significantly lower tripping times than ordinary protection schemes based on time independent over current relays.

 

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