Partial discharges in high-voltage insulation of turbogenerators

2010 ◽  
Author(s):  
Jan Klasna ◽  
Petr Martinek ◽  
Radek Fanta ◽  
Brush Sem ◽  
Josef Pihera
Keyword(s):  
High Voltage ◽  
Partial Discharges ◽  
High Voltage Insulation

scholarly journals Detection acoustic signals of partial discharges on defects in high voltage insulation

2021 ◽  
pp. 48-55
Author(s):  
D. A. Ivanov ◽  
◽  
T. G. Galieva ◽  
A. V. Golenishchev-Kutuzov ◽  
M. F. Sadykov ◽  
...  
Keyword(s):  
High Voltage ◽  
Acoustic Signals ◽  
Diagnostic Information ◽  
Partial Discharges ◽  
Physical Processes ◽  
Place Of Origin ◽  
High Voltage Insulation

The article is devoted to the method of acoustic registration of partial discharges in high-voltage insulators. Physical processes of generation of various types of partial discharges in high-voltage insulators are considered. The instrumental implementation and method of processing diagnostic information from sensitive elements — acoustic receivers of the ultrasonic range are described. The ability to detect sources of partial discharges with reference to the place of origin is important for localizing a faulty element and its further diagnosis.

scholarly journals Influence of additional dielectric coatings on the electrode surfaces on selected parameters of acoustic emission signals in high-voltage gas insulation systems

2021 ◽  
Author(s):  
Arkadiusz Dobrzycki ◽  
Władysław Opydo ◽  
Sebastian Zakrzewski
Keyword(s):  
Acoustic Emission ◽  
High Voltage ◽  
Single Pulse ◽  
Partial Discharges ◽  
Chamber Pressure ◽  
Electrode Surfaces ◽  
Dielectric Coatings ◽  
Signal Parameters ◽  
Insulation Systems ◽  
High Voltage Insulation

AbstractThe paper is devoted to the study of impact of additional dielectric coatings placed on the surface of the electrodes on the operation of a high-voltage insulation system with air as insulating medium. The study mainly focused on measurement of partial discharges (PDs) with the use of acoustic emission method. Tests were conducted in various levels of chamber pressure. Applicable parameters of recorded signals were analyzed with the use of applications developed in the environment of MATLAB software. The results of analyses clearly show that presence of additional coatings has impact on signal parameters and thus indirectly on PDs. The use of coatings reduces the duration of a single pulse (event) and increases its amplitude. Furthermore, the influence of degradation of the coating caused by individual discharges on the values of the analyzed parameters was analyzed. The study has shown, however, that this effect is negligible.

scholarly journals Device for online monitoring of insulation faults in high-voltage switchgears

2021 ◽  
Vol 17 (2) ◽  
pp. 155014772199928
Author(s):  
Jiajia Song ◽  
Jinbo Zhang ◽  
Xinnan Fan
Keyword(s):  
Fourier Transform ◽  
High Voltage ◽  
Online Monitoring ◽  
Pulse Current ◽  
Partial Discharge ◽  
Current Method ◽  
Capacitive Sensor ◽  
Accurate Diagnosis ◽  
Partial Discharges ◽  
Urgent Problem

Partial discharges are the major cause of deterioration in the insulation characteristics of switchgears. Therefore, timely detection of partial discharge in switchgear and potential insulation faults is an urgent problem that needs to be addressed in the power supervision industry. In this study, a device was proposed for online monitoring of high-voltage switchgears based on pulse current method and ozone (O3) detection. The pulse current method obtains the PD signal by monitoring the phase holes on the switch indicator. Occurrence of a partial discharge in a certain phase leads to the production of a discharge pulse, which can be coupled out by a capacitive sensor. The current spectrum and the O3 produced by partial discharge were processed via fast Fourier transform for accurate diagnosis of the occurrence of partial discharge and its severity in switchgears. The proposed method allows for convenient acquisition of the partial discharge signal, simple installation of the device, and realization with inexpensive sensors.

Sign in / Sign up

Export Citation Format

Share Document