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.

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 Partial discharge detection device using ultrasonic sensor on medium voltage XLPE cable

2020 ◽  
Vol 17 (2) ◽  
pp. 886
Author(s):  
I. F Radzi ◽  
N H Nik ◽  
N Rameli ◽  
A. Mohd Ariffin ◽  
M. S. Abd Rahman ◽  
...  
Keyword(s):  
Partial Discharge ◽  
Partial Discharges ◽  
Acoustic Properties ◽  
Xlpe Cable ◽  
Medium Voltage ◽  
Ultrasonic Sensing ◽  
Prototype Device ◽  
Cost Efficient ◽  
Commercial Applications ◽  
Warning Device

<span>There are many methods that have been studied by earlier researchers in order to detect the acoustic properties of Partial Discharge (PD) emitted by PD sources. One of the methods known as ultrasonic sensing on medium voltage Cross-Linked Polyethylene (XLPE) cable was adopted to detect partial discharges on commercial applications, usually by using Acoustic Emission (AE) sensors. This paper presents the processes of designing a PD sensor to detect the acoustic properties of the partial discharges on medium voltage XLPE cable. This PD sensor method works by detecting the partial discharges occurred at the joint of the cable which can act as an early warning device to help minimize the repair and maintenance costs of degrading cable. Result of the experiment shows the complete design of the prototype device, the device after fabrication and the functionality of the device. This design of the prototype can be beneficial for future uses in designing cost efficient and smaller sized PD detection devices. By positioning the sensor in horizontal position directly to the source of PD on the cable, the sensor will be able to detect acoustic properties of PD, by picking up the frequencies beyond 40 kHz. By varying the voltage applied values, a design of experiment (DOE) is carried out accordingly. Result of the experiment shows that the prototype device is functioning as expected, and hence this finding will be very useful to the consumers of power industries as the sensor device can serve as an alternative device to the commercialized PD sensing devices which are bulky and expensive.</span>

New solutions in EDP Distribuicao medium voltage overhead lines

2009 ◽  
Author(s):  
A. Cardoso ◽  
J. Cardoso ◽  
J. Figueiredo ◽  
N. Mendes
Keyword(s):  
Overhead Lines ◽  
Medium Voltage
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