Corrosion Condition Detect of Entire Grounding System in a 500kV Converting Station Using Electrical Impedance Imaging Method

He, Yifan; Shao, Xianjun; Hu, Jian; Liu, Yuanchen; Jin, Chaohui; Pan, Jianqiao

doi:10.1109/ichve.2018.8641878

Cited by 4 publications

(5 citation statements)

References 6 publications

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“…The grounding grid is buried in soil about 0.8m deep underground, making it difficult to excavate and replace [8]. Therefore, predicting corrosion defects of the grounding grid based on information that can be obtained above the ground is important for guiding operation and maintenance [9][10][11] and has important engineering significance. In grounding grid research, generally, the optimization design of the grounding grid and the grounding performance of the grounding grid are studied [12,13].…”

Section: Introductionmentioning

confidence: 99%

An Improved Magnetic Field Method to Locate the Grounding Conductor

Yang

Liu

Lai

et al. 2023

Sensors

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The location of the grounding grid conductors is critical for performing corrosion diagnosis and maintenance work. An improved magnetic field differential method to locate the unknown grounding grid based on truncation errors and the round-off errors analysis is presented in this paper. It was proven that a different order of the magnetic field derivative can be used to determine the position of the grounding conductor according to the peak value of the derivative. Due to the accumulative error of higher differentiation, the truncation error and rounding error were used to analyze to accumulative error and to determine the optimal step size to measure and calculate the higher differentiation. The possible range and probability distribution of the two kinds of errors at each order are described, and the index of peak position error was derived, which can be used to locate the grounding conductor in the power substation.

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Section: Introductionmentioning

confidence: 99%

An Improved Magnetic Field Method to Locate the Grounding Conductor

Yang

Liu

Lai

et al. 2023

Sensors

Self Cite

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“…The literature on the fault diagnosis of grounding grid is classified into three categories: electric network methods [4]- [7], electrochemical detection methods [8]- [10] and electromagnetic methods [11]- [15]. In electric network methods the grounding grid is treated as a resistive network and measures the port resistance of the vertical conductor to calculate the branch resistance.…”

Section: Introductionmentioning

confidence: 99%

Grounding Grid Fault Diagnosis With Emphasis on Substation Electromagnetic Interference

et al. 2022

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Grounding grid fault diagnosis is essential for the safe operation of a substation. However, the substation vicinity is highly electromagnetic. Therefore, the electromagnetic based fault diagnosis is vulnerable to electromagnetic interference (EMI). This paper presents the gradient electromagnetic method for the grounding grid fault diagnosis but unlike the previous methods, fault diagnosis here includes the breakpoints and percentage corrosion simultaneously. The diagnosis is based on comparing the calculated resistivity with the designed resistivity of the grid. The resistivity is calculated from the grid's surface electric and magnetic fields. Furthermore, the existing literature, emphasis on EMI is negligible with the main focus on fault diagnosis only. Therefore, to cope with the EMI, we utilized the Independent Vector Analysis (IVA) to isolate the grounding grid signal from the interfered signal. The validity of IVA is examined by comparing with different known isolation algorithms considering various evaluation criteria. The mathematical reasoning, simulation results and experimental output illustrate that the gradient electromagnetic method along the IVA is feasible for grounding grid fault diagnosis under substation electromagnetic environment (EME).

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“…The soil resistivity method measures the apparent resistivity of the ground using four electrode arrays, of which two electrodes are used to transmit a controlled current and the other two electrodes are used to measure the induced potentials [11,12]. The corrosion diagnosis of a grounding grid is theoretically feasible through a resistivity distribution image [13,14]. This method is restricted by seasonal and field operating conditions, as the measured results can be affected by temperature, humidity, and the relative positions of the electrodes.…”

Section: Introductionmentioning

confidence: 99%

Non-destructive diagnosis of grounding grids based on the electromagnetic induction impedance method

Song¹,

Dong²,

Wang³

et al. 2021

Meas. Sci. Technol.

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When attempting to detect faults in grounding grids, the electromagnetic induction method is hampered by the failure of fault diagnosis based on magnetic flux density detection. An electromagnetic induction impedance method is proposed to diagnose corrosion faults by detecting the induced impedance. A non-destructive testing prototype was developed. The sensor of the prototype consists of biaxial sensing coils, a frequency selection module, and a dual-channel synchronous demodulator. The biaxial sensing coils are configured as four identical coils forming a cross. This symmetrical structure realizes the detection of unknown topological structures in grounding grids. The frequency selection module improves the signal-to-noise ratio of the system. The digital demodulator synchronously extracts the phase information in two orthogonal directions. The key technical indicators of the prototype, such as the frequency characteristics, the amplitude accuracy, the phase accuracy, the interference resistance, and the amplitude consistency between channels are tested. Experiments were carried out on a real-size physical model, corroded samples, and an actual operating substation. The results confirm the feasibility of the method and the prototype for the detection of topological structures, disconnections, and faults in grounding grids.

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Corrosion Condition Detect of Entire Grounding System in a 500kV Converting Station Using Electrical Impedance Imaging Method

Cited by 4 publications

References 6 publications

An Improved Magnetic Field Method to Locate the Grounding Conductor

An Improved Magnetic Field Method to Locate the Grounding Conductor

Grounding Grid Fault Diagnosis With Emphasis on Substation Electromagnetic Interference

Non-destructive diagnosis of grounding grids based on the electromagnetic induction impedance method

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