scholarly journals Combined application of ultrasonic and ultra high frequency techniques in the partial discharge detection and positioning of gas insulated switchgear

2021 ◽  
Vol 621 ◽  
pp. 012002
Author(s):  
Jing Xiao ◽  
Xin Li ◽  
Yongming Tang ◽  
Jinghao Hu ◽  
Lirong Wang ◽  
...  
Keyword(s):  
High Frequency ◽  
Partial Discharge ◽  
Ultra High Frequency ◽  
Combined Application ◽  
Gas Insulated Switchgear ◽  
Discharge Detection

Present Situation and Prospect of Internal Sensors for UHF Detection in GIS

2015 ◽  
Vol 738-739 ◽  
pp. 38-41
Author(s):  
Yu Bing Duan ◽  
Hao Zhang ◽  
Jun Yong ◽  
Bo Yang ◽  
Xiao Li Hu ◽  
...  
Keyword(s):  
Performance Indicators ◽  
High Frequency ◽  
Partial Discharge ◽  
Present Situation ◽  
Ultra High Frequency ◽  
Gas Insulated Switchgear ◽  
Discharge Detection

This paper summarizes the application situation of the ultra-high frequency (UHF) method in gas insulated switchgear (GIS) partial discharge detection, as well as the differences between internal and external UHF sensors. The performance indicators of internal sensors are introduced, and five main types of internal sensors are discussed and evaluated. In addition, several problems to be solved are posed for researchers.

Experimental Research on the Sensitivity of Partial Discharge Ultra High Frequency Sensor Structure Parameters

2021 ◽  
Vol 16 (6) ◽  
pp. 911-918
Author(s):  
Wen-Yi Li
Keyword(s):  
High Frequency ◽  
Partial Discharge ◽  
Structural Parameter ◽  
Test Model ◽  
Frequency Signal ◽  
High Frequency Signal ◽  
Ultra High Frequency ◽  
Gas Insulated Switchgear ◽  
Sensor Structure ◽  
Sensing Sensitivity

With the development of intelligent high voltage switch, online gas insulated switchgear discharge detection technology has been more and more widely applied. Because of the high sensing sensitivity and good antiinterference performance of build-in partial discharge sensor, it is currently required to install them on gas insulated switchgear products with voltage levels of 220 kV and above at the factory. The structural parameters of the build-in partial discharge sensor is of great importance to its sensing sensitivity. Therefore, in this paper, the influence of the structure change on the sensitivity of axisymmetric gas insulated switchgear build-in partial discharge sensor is experimentally studied. A practical gas insulated switchgear test model was established in the laboratory, and the frequency domain measurement system based on Spectrogram analyzer and synchronous sweep signal generator was adopted. By comparing the insertion loss generated by the build-in sensor when receiving sweep signal, the influence of structural parameter changes on the sensing sensitivity was analyzed. The results show that the diameter of the build-in sensor should be matched with the diameter of the hand-hole. The match of the larger diameter of the hand-hole and the smaller diameter of the sensor can increase the sensing sensitivity, but when the diameter of the sensor is close to the diameter of the hand-hole, the sensitivity will be significantly reduced. In addition, metal bolts with the sensor electrode and its insulating support fixed to the hand-hole cover can also result in a significant reduction in sensing sensitivity. Using the same measuring principle and system, the propagation attenuation characteristics of partial discharge ultra high frequency signal in gas insulated switchgear typical structures (linear and L-shaped structures) are also experimentally studied. The results show that the average attenuation of partial discharge ultra high frequency signal in gas insulated switchgear along the linear distance is 0.3 dB/m, and the attenuation through every L-shaped structure is 4.2 dB.

scholarly journals Study on the Application of an Ultra-High-Frequency Fractal Antenna to Partial Discharge Detection in Switchgears

Sensors ◽  
2013 ◽  
Vol 13 (12) ◽  
pp. 17362-17378 ◽  
Author(s):  
Chenguo Yao ◽  
Pan Chen ◽  
Congjian Huang ◽  
Yu Chen ◽  
Panpan Qiao
Keyword(s):  
High Frequency ◽  
Partial Discharge ◽  
Fractal Antenna ◽  
Ultra High Frequency ◽  
Discharge Detection

Portable Acoustic-Electric Combined System for Partial Discharge Detection in GIS

2013 ◽  
Vol 303-306 ◽  
pp. 555-561
Author(s):  
Bin Liu ◽  
Yue Hu ◽  
Qian Chen ◽  
Wei Dong Zhang ◽  
Ling Yu Cao ◽  
...  
Keyword(s):  
High Frequency ◽  
Phase Distribution ◽  
Detection System ◽  
Partial Discharge ◽  
Time Difference ◽  
Discharge Process ◽  
Distribution Analysis ◽  
Ultra High Frequency ◽  
Time Frequency ◽  
Discharge Detection

A portable acoustic-electric detection system for GIS partial discharge is developed. This system integrates both high and low-speed data acquisition devices, and is capable of multichannel joint detection of ultra-high-frequency and high-frequency current as well as ultrasonic signal generated during the GIS partial discharge process. The software of this system is developed based on LabVIEW. It can successively capture, acquire and store the pulse waveform of partial discharge, calculate the phase of discharge pulse and realize time-frequency analysis and amplitude-phase distribution analysis of PD signals at the same time. By calculating the time difference of multi-channel ultra-high-frequency (UHF) signals and of PD ultrasonic signals or the time difference between the two, the system is able to locate the PD source. This system has been applied to on-site partial discharge detection of 220kV and 500kV GIS substations, and the test results have verified the performance of the system.

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