Conference Paper

Performance of novel neutral admittance criterion in MV-feeder earth-fault protection

ABB Oy Distribution Automation - Finland
DOI: 10.1049/cp.2009.0716 Conference: Electricity Distribution - Part 1, 2009. CIRED 2009. 20th International Conference and Exhibition on
Source: IEEE Xplore


This paper describes the fundamentals of the neutral admittance based earth-fault protection. First, the theory is briefly introduced. Secondly, certain improvements to the traditional measuring principle and operation characteristics are suggested. Finally, the performance is evaluated and compared with traditional earth-fault protection schemes using simulated and recorded data. The results show that the neutral admittance criterion has potential to become a standard and widely used earth-fault protection function in high impedance earthed networks.

Download full-text


Available from: Ari Wahlroos, Feb 11, 2015
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: 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.
    Full-text · Article · Mar 2015 · IET Generation Transmission & Distribution