Effective partial discharge measurement method for XLPE cables based on propagation characteristics of high frequency signal

2012 ◽  
Author(s):  
Toshihiro Takahashi ◽  
Tatsuki Okamoto
Keyword(s):  
High Frequency ◽  
Measurement Method ◽  
Partial Discharge ◽  
Propagation Characteristics ◽  
Frequency Signal ◽  
High Frequency Signal ◽  
Discharge Measurement

Experimental Study of Partial Discharge UHF Detection in Transformer Oil

2013 ◽  
Vol 437 ◽  
pp. 341-345
Author(s):  
Yao Feng ◽  
Fu Jiang Mo ◽  
Zhang Jian
Keyword(s):  
Frequency Spectrum ◽  
High Frequency ◽  
Partial Discharge ◽  
Transformer Oil ◽  
Radiation Characteristics ◽  
Frequency Signal ◽  
High Frequency Signal ◽  
Line Radiation ◽  
Attenuation Characteristics ◽  
Oscillation Characteristics

This paper studies the characteristic frequency of partial discharge in transformer oil [, and with the spectrum characteristics of partial discharge in air was measured by the comparison of uhf signal inside the metal tank and the attenuation characteristics and metal wire in the air on the radiation characteristics of uhf signals. The results show that the frequency spectrum of the partial discharge in transformer oil is higher than the frequency spectrum of the partial discharge in air. Ultra high frequency signal have the oscillation characteristics in the metal box body propagation. The transformer has the certain ability of outgoing line radiation of partial discharge signal inside.

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.

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