Application of sequential hierarchical signal method in online monitoring of partial discharge in GIS

2021 ◽  
Author(s):  
Yong Cui ◽  
Da Zhang ◽  
Xinyan Feng ◽  
Hui Tian ◽  
Yanzhi Zhao ◽  
...  
Keyword(s):  
Online Monitoring ◽  
Partial Discharge ◽  
Signal Method

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.

scholarly journals Distributed Online Monitoring Method and Application of Cable Partial Discharge Based on $\varphi$ -OTDR

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 144444-144450 ◽  
Author(s):  
Wenxia Pan ◽  
Kun Zhao ◽  
Chen Xie ◽  
Xinrui Li ◽  
Jie Chen ◽  
...  
Keyword(s):  
Online Monitoring ◽  
Partial Discharge ◽  
Monitoring Method

scholarly journals Resonant Frequency Calculation and Optimal Design of Peano Fractal Antenna for Partial Discharge Detection

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Jian Li ◽  
Changkui Cheng ◽  
Lianwei Bao ◽  
Tianyan Jiang
Keyword(s):  
Pattern Recognition ◽  
Optimal Design ◽  
Resonant Frequency ◽  
High Frequency ◽  
Approximate Formula ◽  
Online Monitoring ◽  
Partial Discharge ◽  
Fractal Antenna ◽  
Insulation Defect ◽  
Frequency Calculation

Ultra-high-frequency (UHF) approaches have caught increasing attention recently and have been considered as a promising technology for online monitoring partial discharge (PD) signals. This paper presents a Peano fractal antenna for UHF PD online monitoring of transformer with small size and multiband. The approximate formula for calculating the first resonant frequency of the Peano fractal antenna is presented. The results show that the first resonant frequency of the Peano fractal antenna is smaller than the Hilbert fractal antenna when the outer dimensions are equivalent approximately. The optimal geometric parameters of the antenna were obtained through simulation. Actual PD experiments had been carried out for two typically artificial insulation defect models, while the proposed antenna and the existing Hilbert antenna were both used for the PD measurement. The experimental results show that Peano fractal antenna is qualified for PD online UHF monitoring and a little more suitable than the Hilbert fractal antenna for pattern recognition by analyzing the waveforms of detected UHF PD signals.

The Necessity of Intelligent Transformer On-Line Monitoring Configuration Analysis

2013 ◽  
Vol 427-429 ◽  
pp. 1297-1300
Author(s):  
Lu Lu Yuan ◽  
Zhu Yuan ◽  
Wei Wei Zhang
Keyword(s):  
Gas Chromatography ◽  
Optical Fiber ◽  
Temperature Measurement ◽  
Real Time ◽  
Online Monitoring ◽  
Pulse Current ◽  
Partial Discharge ◽  
Current Method ◽  
On Line ◽  
Fiber Winding

Intelligent transformer as an important part of intelligent substation, can be flexible and controllable and can real-time monitoring, protection, control transformer normally. online monitoring is the guarantee of realization of intelligent transformer, Partial discharge on-line monitoring optical fiber temperature measurement, casing medium on-line monitoring, winding on-line monitoring are the most important three aspects. The commonly used methods of Partial discharge on-line monitoring, a pulse current method, UFH method, gas chromatography, and ultrasound. The analysis of necessity of the main transformer partial discharge on-line monitoring configuration, and the fiber winding temperature online monitoring configuration.

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