Open AccessEarth fault location based on evaluation of voltage sag at secondary side of medium voltage/low voltage transformers
Author(s) -
Topolanek David,
Lehtonen Matti,
Adzman Mohd Rafi,
Toman Petr
Publication year - 2015
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2014.0460
Subject(s) - resistor , voltage , voltage sag , transformer , distribution transformer , low voltage , electrical engineering , power quality , fault (geology) , grid , engineering , high voltage , electronic engineering , computer science , seismology , geology , geometry , mathematics
The main reasons for installation of power quality meters in distribution transformer substations are power quality monitoring and global evolution of electrical network towards the ‘smart grid’. In case that all measurements from the meters are properly synchronised and centralised, new possibilities of control or evaluation of the network are enabled. This contribution proposes the possibility for an earth fault localisation with the aid of synchronised data recorded on the low‐voltage side of the medium voltage/low voltage transformers in compensated neutral distribution networks which are equipped with auxiliary resistor for short‐time increasing of the active part of the fault current. The described method uses voltage sags evoked by connecting of the auxiliary resistor for locating the faulty section. The proposed method is tested with the help of numerical model which presents a part of the distribution network.