MV overhead lines using XLPE covered conductors. Scandinavian experience and NORWEB developments

1995 ◽  
Author(s):  
L. Voldhaug
Keyword(s):  
Overhead Lines ◽  
Covered Conductors

scholarly journals Verification of a Novel Method of Detecting Faults in Medium-Voltage Systems with Covered Conductors

2017 ◽  
Vol 24 (2) ◽  
pp. 277-288 ◽  
Author(s):  
Stanislav Mišák ◽  
Štefan Hamacek ◽  
Mikołaj Bartłomiejczyk
Keyword(s):  
Relay Protection ◽  
Overhead Lines ◽  
Medium Voltage ◽  
New Methods ◽  
Protection Systems ◽  
Novel Method ◽  
Covered Conductors ◽  
Tree Branch ◽  
New System ◽  
Three Phases

AbstractThis paper describes the use of new methods of detecting faults in medium-voltage overhead lines built of covered conductors. The methods mainly address such faults as falling of a conductor, contacting a conductor with a tree branch, or falling a tree branch across three phases of a medium-voltage conductor. These faults cannot be detected by current digital relay protection systems. Therefore, a new system that can detect the above mentioned faults was developed. After having tested its operation, the system has already been implemented to protect mediumvoltage overhead lines built of covered conductors.

scholarly journals Towards the Text Compression Based Feature Extraction in High Impedance Fault Detection

Energies ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2148 ◽  
Author(s):  
Tomáš Vantuch ◽  
Michal Prílepok ◽  
Jan Fulneček ◽  
Roman Hrbáč ◽  
Stanislav Mišák
Keyword(s):  
Partial Discharge ◽  
Partial Discharges ◽  
Classification Model ◽  
Discharge Pattern ◽  
Text Compression ◽  
Overhead Lines ◽  
Medium Voltage ◽  
Similarity Estimation ◽  
High Impedance ◽  
Covered Conductors

High impedance faults of medium voltage overhead lines with covered conductors can be identified by the presence of partial discharges. Despite it is a subject of research for more than 60 years, online partial discharges detection is always a challenge, especially in environment with heavy background noise. In this paper, a new approach for partial discharge pattern recognition is presented. All results were obtained on data, acquired from real 22 kV medium voltage overhead power line with covered conductors. The proposed method is based on a text compression algorithm and it serves as a signal similarity estimation, applied for the first time on partial discharge pattern. Its relevancy is examined by three different variations of classification model. The improvement gained on an already deployed model proves its quality.

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