Online Monitoring for Underground Power Cable Insulation Based on Common-Mode Signal Injection

Wu, Yang; Yang, Yanyong; Wang, Zhiyuan; Zhang, Pinjia

doi:10.1109/tie.2021.3102410

Cited by 17 publications

(7 citation statements)

References 31 publications

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“…The degree of insulation degradation can be determined based on the calculated in- When the two-phase insulation deteriorates (set to b and c phases), it can be derived from Equations ( 2) and ( 4) such that the variation of the zero-sequence current at the beginning and end of the branch is (19) Processes 2023, 11, 795 9 of 15 Therefore, this characteristic can be used as a criterion when the phase angle of ∆ . I i of a certain branch is between the phase angle of the two phases' relative voltage to the ground.…”

Section: Cable Insulation Diagnosis Methods Base On Decision Treementioning

confidence: 99%

“…Ref. [19] proposed a monitoring scheme method based on leakage current measurements at a selected monitoring frequency, and an aging feature extraction method based on principal component analysis (PCA), which can estimate the severity of insulation aging. With the development of computer technology, more and more scholars use data-driven machine learning algorithms in cable fault diagnosis [20][21][22][23][24][25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

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Decision-Making Method for Mine Cable Insulation Monitoring and Grounding Fault Diagnosis

Chen

Sun

et al. 2023

Processes

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Real-time monitoring of the power cable state has tremendous significance for ensuring the safe and economic operation of mine power distribution systems. However, due to the harsh conditions of underground coal mines, it is difficult for the cable monitoring system operating in underground coal mines to carry out large-scale calculations to diagnose the grounding fault of the cable. Additionally, there are many types of cable grounding faults, such as single grounding fault and two-phase ground fault. Therefore, how to determine the type of grounding fault quickly through effective calculations and alarms to select the grounding cable is always a difficult task. In this study, to reduce the complexity of cable insulation state classification, we develop a novel classification method based on the decision tree algorithm. Concerning the zero-sequence network under different insulation conditions, the first calculation’s positive and negative values were generated to identify whether the cable insulation was symmetrical. Then, the insulation degradation phase is identified by the relationship between the three-phase voltage phase angle and the current difference variation between the beginning and end of the line. By substituting the correlation quantities collected by a wide-area synchronous measurement system into different equations, the whole grid’s decision tree was constructed in different insulation states. Then, the insulation state of each line was evaluated according to the conductance value. The effectiveness of the proposed method was verified using a 35/6 kV mine power distribution system model based on the MATLAB/Simulink platform. The test results illustrate that the method can accurately diagnose the power cable insulation state based on the decision tree of whether the grid three-phase loads operate in an ungrounded mode or not.

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Section: Cable Insulation Diagnosis Methods Base On Decision Treementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Decision-Making Method for Mine Cable Insulation Monitoring and Grounding Fault Diagnosis

Chen

Sun

et al. 2023

Processes

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“…When the cable has PD, the backscattered Rayleigh light intensity change of the PD position is higher than the intact position. Yang Wu [ 16 ] proposed a monitoring scheme based on CM leakage current measurements at selected monitoring frequencies and developed an aging feature extraction method based on principal component analysis (PCA) which provides an estimate of the insulation’s aging severity.…”

Section: Literature Reviewmentioning

confidence: 99%

A Comprehensive Operation Status Evaluation Method for Mining XLPE Cables

Wang

Chen

Sun

et al. 2022

Sensors

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At present, the online insulation monitoring and fault diagnosis of mining cables are extensively discussed, while their operation status assessment has not been deeply studied. Considering that mining cables are closely related to the safe and stable operation of coal mine power supply systems, a comprehensive evaluation method including the Analytic Hierarchy Process (AHP), the membership cloud theory, and the D-S evidence theory is proposed in this paper in order to accurately assess the operation status of the mining XLPE cable. Firstly, the membership cloud is introduced to solve the index membership degree and the weights are calculated by an improved weight vector calculation method. Secondly, the conversion from the base layer indicator membership degree to the target layer trust degree is realized based on the D-S evidence theory. Then, the cable operation status is judged via the trust degree maximum and the distribution of conflict coefficients is further analyzed to warn the indicators with a bad status in the base layer. Finally, the feasibility of the proposed evaluation method is verified by a sufficient and detailed case analysis.

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“…Leakage current measurement is one of the most reliable and effective methods for condition monitoring of cable insulation [6]. Because leakage current in HV and EHV submarine cables is supposed to change due to electrothermal ageing of submarine cable insulation [1][2][3][4].…”

Section: Calculation Of Dielectric Parameters In Frequency Domain Bas...mentioning

confidence: 99%

“…When operating in a harsh environment, submarine cables may experience accelerated insulation degradation due to thermal and/or electrical stress [3,4]. This can reduce insulation system reliability, even resulting in premature failure of electrical insulation, which threatens the safe and reliable operation of the power system [5,6]. The consequences of HV and EHV submarine cable failure will also lead to expensive maintenance costs.…”

Section: Introductionmentioning

confidence: 99%

Influence of thermal ageing on high‐field polarisation characteristics and conductivity behaviour of submarine polymeric cables insulation

et al. 2022

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Diagnosing insulation intrinsic ageing is essential for preventing insulation failure of submarine cables, and in case of failure, helping in any decision about maintenance actions. In this study, a novel aged cable diagnosis approach based on high‐voltage frequency domain spectroscopy (HV‐FDS) with broader frequency width is proposed to analyse the high‐field polarisation characteristics and conductivity behaviour of 500 kV submarine polymeric cables insulation, aiming to support the evaluation of overall insulation ageing. The measurement principle of HV‐FDS and relaxation mechanism are stated, and then focus is on studying the extent of change of polarisation and conduction properties of submarine cables insulation as a function of ageing stress and time. Moreover, the high‐field polarisation characteristics and conductivity behaviour are discussed in‐depth based on the carrier transport and trap properties. Finally, the novel diagnostic indicator based on the high‐field characteristics is extracted to quantify the thermal ageing state of submarine cables insulation. Results show that the high‐field polarisation characteristics and conductivity behaviour seem to become sensitive diagnostic quantities if measured at reasonably high voltage, which are able to reveal mechanisms associated with thermo‐oxidative ageing as that generated in the testing procedure considered in this paper. Sensitivity is considerably higher than that experienced in typical dielectric spectroscopy approaches.

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Online Monitoring for Underground Power Cable Insulation Based on Common-Mode Signal Injection

Cited by 17 publications

References 31 publications

Decision-Making Method for Mine Cable Insulation Monitoring and Grounding Fault Diagnosis

Decision-Making Method for Mine Cable Insulation Monitoring and Grounding Fault Diagnosis

A Comprehensive Operation Status Evaluation Method for Mining XLPE Cables

Influence of thermal ageing on high‐field polarisation characteristics and conductivity behaviour of submarine polymeric cables insulation

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