Controlling voltage dips during nearby line-to-ground faults at HV connected industrial consumers

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Prikler László
Department of Electric Power Engineering

Electrical energy plays a very important role in today’s world. We could not imagine life without computers, electronic gadgets or street lighting. Without electrical power our modern world would be paralyzed, and for this reason it is essential to deliver this energy to the consumers with minimal faults.

This study examines the role of electric power transmission and distribution system which is monitored by the transmission operator (MAVIR Zrt. in Hungary) and the Distribution Network Operator (DNO) Companies. But in this system faults may occur, and those faults can lead to voltage dips or the temporary shut down of parts of the system or the whole system.

This dissertation examines the methods of controlling voltage dips during nearby line to ground faults at high voltage (120 kV) connected industrial consumers. In this dissertation I examine the different types of faults, the actions which might lead to faults, and the role of supplying data about the transmission and distribution system in Hungary.

This dissertation presents the possible methods of limiting the loss of service due to failure by avoiding voltage dip and maintaining high voltage quality.

This dissertation investigates the methods of building a new 400/120 kV substation, changing the solid grounding of the transformers to resonance grounding, splitting the busbars and building a new 120 kV substation.

At the end of my dissertation I present the effectiveness of some of these methods. My research is based on calculations I performed using the system simulation software NEPLAN. Factual data for those calculations gleaned from the system maintained by EDF DÉMÁSZ.


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