Implementation of a Novel Very Low Frequency Cosine-Rectangular Voltage Generator for Insulation Testing of Power Cables

Yang, Saike; Wang, Li; Guo, Xiaokai; Sun, Tonghua; Lu, Yuxin; Yan, Yuan; Li, Hongjie

doi:10.1109/tpel.2020.3042639

Cited by 6 publications

(4 citation statements)

References 25 publications

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“…(23) where U m (ω) is the PD measured signal, H CAB (ω) is the transfer function of the cable that the PD signal propagated through, H PDC (ω) and H M (ω) are the transfer functions of the PD coupler and the measurement system. H CAB (ω) can be obtained from Equations ( 11) and (12).…”

Section: Ifdm Reconstruction Processmentioning

confidence: 99%

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Development of the accurate localization of partial discharges in medium‐voltage XLPE cables based on pulse reconstruction

Yang

Zhao

Wang

et al. 2021

IET Generation Trans & Dist

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A method of reconstructing the original partial discharge (PD) signal to improve the accuracy of PD localization in cross-linked polyethylene (XLPE) cables is presented here. XLPE cables, extremely sensitive to PDs, are the most popular underground cables in urban grids. The conventional PD localization methods, based on evaluation of the arrival times of PD pulses in the time domain, are negatively affected by the dispersion and attenuation of PD signals propagating in the power cable. A method for the accurate localization of PDs realized through inverse frequency domain modelling (IFDM) is presented here. The method, eliminating the systematic localization error caused by the dispersion and attenuation, significantly improves the localization accuracy. The locations of the PD are identified by comparing peak values of the initial PD signals reconstructed from different extracted pulses. A method for evaluating the propagation constant of the cable is also presented. The efficiency of the accurate localization method was verified by laboratory experiments. Besides, the inherent limitations of the conventional PD localization method for longer cable tests are discussed. The inevitable location error in the conventional methods does not exist in the new method.

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Section: Ifdm Reconstruction Processmentioning

confidence: 99%

“…The damped AC (DAC) voltage PD test system is commercialized and applied successfully [9][10][11]. Some researchers tried to use very low frequency voltage to test PD signals [12,13]. After the PD signals are excited and captured, the PD is always localized using the time domain reflectometry (TDR) method [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Development of the accurate localization of partial discharges in medium‐voltage XLPE cables based on pulse reconstruction

Yang

Zhao

Wang

et al. 2021

IET Generation Trans & Dist

Self Cite

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“…The dielectric loss factor (tangent delta, Tan δ) is a common used parameter to estimate the bulk aging condition of the XLPE insulation. Tan δ is usually obtained under a very low frequency (VLF) high voltage, typically at a 0.1Hz sinusoidal voltage, though there may be some other types of waveform, such as square wave, cosine-rectangular wave [8][9][10][11]. The Tan δ values at different time, of different phases and under different voltages are adopted to evaluate the degradation of cable insulation.…”

Section: Introductionmentioning

confidence: 99%

On-site Insulation Tests for MV cable using Very Low Frequency and Damped AC Techniques

Hóu¹,

Yu²,

Xu³

et al. 2023

AETR

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MV cables are vital components in urban power networks. Several insulation test techniques are proposed for guaranteeing the operation of MV cables. In this paper, two kinds of off-line testing techniques are introduced, namely Tanδ measurement using VLF and PD detection using DAC. Firstly, the operation principle of each technique is introduced. Then, a simulation model was built in Simulink platform to demonstrate the operation processes of detecting the defects in the cable. At last, an on-site case using both VLF and DAC techniques is introduced for presenting the functions of different techniques.

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“…The voltage withstand test is a method used to detect cable insulation or connection defects. This method is destructive and for a long connection the test power source can be an issue [6]. The tan δ measurement can be used to evaluate the overall deterioration of the insulation.…”

Section: Introductionmentioning

confidence: 99%

Multi‐type defect detection and location based on non‐destructive impedance spectrum measurement for underground power cables

Su¹,

Wei²,

Zhang³

et al. 2023

High Voltage

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Power cable defect detection and location is a crucial aspect in power asset maintenance. Impedance spectrum measurement can be used as a non‐destructive tool for cable monitoring. Defects from overheating and moisture ingress are investigated by the authors, and it is shown that multi‐type cable defects can be detected and located by this methodology. With both electromagnetic analysis and experimental investigation, the relation between impedance variation and the dielectric permittivity is studied to reveal the method's mechanism. An approach to implement such impedance measurement online is proposed and its perspectives in terms of sensitivity is investigated by field scale tests. It is shown that 2% impedance variation due to defect should be detectable. Field scale tests show perspectives for online application with signal coupling through a high‐frequency current transformer with focus on the differences in waveforms obtained from the impedance measurements.

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Implementation of a Novel Very Low Frequency Cosine-Rectangular Voltage Generator for Insulation Testing of Power Cables

Cited by 6 publications

References 25 publications

Development of the accurate localization of partial discharges in medium‐voltage XLPE cables based on pulse reconstruction

Development of the accurate localization of partial discharges in medium‐voltage XLPE cables based on pulse reconstruction

On-site Insulation Tests for MV cable using Very Low Frequency and Damped AC Techniques

Multi‐type defect detection and location based on non‐destructive impedance spectrum measurement for underground power cables

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