Threshold Values Determination of Partial Discharges During High-Voltage Transformers Diagnosis by Acoustic Methods

2019 ◽  
Author(s):  
M.A. Kuznetsova ◽  
A.A. Kuznetsov
Keyword(s):  
High Voltage ◽  
Partial Discharges ◽  
Threshold Values ◽  
Acoustic Methods

scholarly journals Threshold values determination in high-voltage equipment diagnosis insulation by registration methods of partial discharges

2019 ◽  
pp. 30-35
Author(s):  
A. A. Kuznetsov ◽  
◽  
A. Yu. Kuzmenko ◽  
M. A. Kuznetsova ◽  
A. V. Simakov ◽  
...  
Keyword(s):  
High Voltage ◽  
Partial Discharges ◽  
Threshold Values

scholarly journals Determination of dV/dt and dI/dt characteristics for high voltage 4H-SiC Schottky diodes with different types of metal-polymeric packages

2020 ◽  
Vol 1679 ◽  
pp. 022045
Author(s):  
S B Rybalka ◽  
E A Kulchenkov ◽  
A A Demidov ◽  
N A Zhemoedov ◽  
A Yu Drakin ◽  
...  
Keyword(s):  
High Voltage ◽  
Schottky Diodes ◽  
Different Types

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.

Spectrographic Analysis of Cast Iron Using Fused Buttons

1971 ◽  
Vol 25 (3) ◽  
pp. 342-344 ◽  
Author(s):  
John P. Cummings ◽  
Ronald H. Hall ◽  
Ronald J. Plenzler
Keyword(s):  
Weight Loss ◽  
Cast Iron ◽  
High Voltage ◽  
Analytical Method ◽  
White Cast Iron ◽  
Inert Atmosphere ◽  
Spectrographic Analysis ◽  
Analytical Results ◽  
Good Homogeneity

This paper presents an analytical method for the determination of minor metals in white cast iron fused buttons. This method enables the measurement of metals in cast iron with rapidity and excellent analytical results. Buttons of 40 g appear to be ideal but smaller button samples can be tolerated. The fused buttons have good homogeneity, very slight weight loss, and no significant change in composition. Metal cast spectrochemical samples are analyzed in an inert atmosphere utilizing a high voltage spark.

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