Testing and Diagnosis of Extra High Voltage Power Cables Using Damped AC Voltages Combined with Distributed Partial Discharge Measurement

2014 ◽  
Vol 1070-1072 ◽  
pp. 1039-1043
Author(s):  
Biao Yan ◽  
Li Zhou ◽  
Jie Chen ◽  
Feng Bo Tao ◽  
Jian Zhang
Keyword(s):  
High Voltage ◽  
Output Voltage ◽  
Partial Discharge ◽  
Assessment Method ◽  
State Assessment ◽  
Signal Acquisition ◽  
Power Cables ◽  
Underground Cable ◽  
Distributed Measurement ◽  
Extra High Voltage

State assessment method of cables with extruded insulation and their accessories, DAC withstand test combined with a diagnostic test (such as PD measurement) has two shortcomings, the output voltage is not high enough for EHV cables, it cannot detect and locate PD effectively when defects are far away from signal acquisition point. This paper focus on DAC voltages up to 250kV and a kind of distributed measurement of PD. Defects existing in arbitrary of tested cable can be accurately measured in theory by installing sensor at intervals along the tested cable. This method has been validated on a long extra high voltage cross-linked polyethylene (XLPE) insulated underground cable circuit and the filed PD test has been completed successfully.

Functions and Theoretical Basis of Partial Discharge On-Line Monitoring System for High-Voltage Cables

2014 ◽  
Vol 672-674 ◽  
pp. 854-857
Author(s):  
Dan Pang ◽  
Xi Lin Zhang ◽  
Zhen Hao Wang ◽  
Dan Zhang ◽  
Xiao Juan Han
Keyword(s):  
High Voltage ◽  
Partial Discharge ◽  
Diagnostic System ◽  
Signal Acquisition ◽  
Xlpe Cable ◽  
Remote Diagnostics ◽  
Testing Technology ◽  
Discharge Status ◽  
On Line ◽  
Frequency Current

A partial discharge (PD) on-line monitoring and positioning system for high-voltage cables based on double-ended testing technology is developed. The hardware of this system includes a high-frequency current sensor, site PD signal acquisition and PD monitoring server. In order to achieve real-time monitoring and remote diagnostics of the XLPE cable partial discharge status, the designed software system is divided into front-end control system and remote diagnostic system. And finally, the correctness and effectiveness of the system is verified by XLPE cable partial discharge testing.

scholarly journals Denoising of Heavily Contaminated Partial Discharge signals in High-Voltage Cables Using Maximal Overlap Discrete Wavelet Transform

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6540
Author(s):  
Mohammed A. Shams ◽  
Hussein I. Anis ◽  
Mohammed El-Shahat
Keyword(s):  
Wavelet Transform ◽  
Discrete Wavelet Transform ◽  
High Voltage ◽  
Signal To Noise Ratio ◽  
Partial Discharge ◽  
Gaussian White Noise ◽  
Discrete Wavelet ◽  
Power Cable ◽  
Power Cables ◽  
Algorithm Performance

Online detection of partial discharges (PD) is imperative for condition monitoring of high voltage equipment as well as power cables. However, heavily contaminated sites often burden the signals with various types of noise that can be challenging to remove (denoise). This paper proposes an algorithm based on the maximal overlap discrete wavelet transform (MODWT) to denoise PD signals originating from defects in power cables contaminated with various levels of noises. The three most common noise types, namely, Gaussian white noise (GWN), discrete spectral interference (DSI), and stochastic pulse shaped interference (SPI) are considered. The algorithm is applied to an experimentally acquired void-produced partial discharge in a power cable. The MODWT-based algorithm achieved a good improvement in the signal-to-noise ratio (SNR) and in the normalized correlation coefficient (NCC) for the three types of noises. The MODWT-based algorithm performance was also compared to that of the empirical Bayesian wavelet transform (EBWT) algorithm, in which the former showed superior results in denoising SPI and DSI, as well as comparable results in denoising GWN. Finally, the algorithm performance was tested on a PD signal contaminated with the three type of noises simultaneously in which the results were also superior.

Dedicated On-Site Condition Monitoring of High Voltage Power Cables up to 150kV

2008 ◽  
Vol 9 (3) ◽  
Author(s):  
Edward Gulski ◽  
Paul P Seitz ◽  
Ben Quak ◽  
Frank Petzold ◽  
Frank de Vries
Keyword(s):  
Signal Processing ◽  
Condition Monitoring ◽  
High Voltage ◽  
Partial Discharge ◽  
Dielectric Losses ◽  
Power Cables ◽  
Site Condition ◽  
Cable System ◽  
Production Methods ◽  
Non Destructive

For advanced, non-destructive on-site condition monitoring of HV power cables up to 150kV by partial discharge detection and dielectric losses measurement it is necessary to energize the disconnected cable system. One of the methods available for this purpose is based on applying damped AC voltages up to 150kV. In this paper, the use of modern technological solutions in power electronics and signal processing as well as in technical design and production methods will be discussed on the basis of the ultra light system (300kg) which is able to test cables up to 20km lengths.

scholarly journals Extra-High-Voltage DC-DC Boost Converters Topology with Simple Control Strategy

2008 ◽  
Vol 2008 ◽  
pp. 1-8 ◽  
Author(s):  
P. Sanjeevikumar ◽  
K. Rajambal
Keyword(s):  
High Voltage ◽  
Output Voltage ◽  
Control Algorithm ◽  
High Efficiency ◽  
Low Cost ◽  
Buck Converter ◽  
Boost Converters ◽  
Wide Range ◽  
Power Transfer Efficiency ◽  
Extra High Voltage

This paper presents the topology of operating DC-DC buck converter in boost mode for extra-high-voltage applications. Traditional DC-DC boost converters are used in high-voltage applications, but they are not economical due to the limited output voltage, efficiency and they require two sensors with complex control algorithm. Moreover, due to the effect of parasitic elements the output voltage and power transfer efficiency of DC-DC converters are limited. These limitations are overcome by using the voltage lift technique, opens a good way to improve the performance characteristics of DC-DC converter. The technique is applied to DC-DC converter and a simplified control algorithm in this paper. The performance of the controller is studied for both line and load disturbances. These converters perform positive DC-DC voltage increasing conversion with high power density, high efficiency, low cost in simple structure, small ripples, and wide range of control. Simulation results along theoretical analysis are provided to verify its performance.

Development of a method of partial discharge detection in extra-high voltage cross-linked polyethylene insulated cable lines

1992 ◽  
Vol 7 (3) ◽  
pp. 1068-1079 ◽  
Author(s):  
G. Katsuta ◽  
A. Toya ◽  
K. Muraoka ◽  
T. Endoh ◽  
Y. Sekii ◽  
...  
Keyword(s):  
High Voltage ◽  
Partial Discharge ◽  
Cable Lines ◽  
Extra High Voltage ◽  
Discharge Detection
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