A virtual instrument for diagnosis to substation grounding grids in harsh electromagnetic environment

Song, Hengli; Dong, Haobin; Zhang, Peng

doi:10.1109/i2mtc.2017.7969925

Cited by 3 publications

(3 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In our previous work [29], the EMI-based NDT equipment operated well and obtained satisfactory results on a small physical model of metal grids in our laboratory. The position and the topological structure can be detected accurately.…”

Section: B Frame Diagram Of the Ndt Systemmentioning

confidence: 69%

An EEMD-Based Electromagnetic Induction Method for Nondestructive Testing of Buried Metal Conductors

et al. 2019

Self Cite

View full text Add to dashboard Cite

Nondestructive testing of substation grounding grids is an issue that has increasing importance. The traditional EMI method transforms the condition of the undergrounding conductors to the surficial induced electric signal in the sensing coil. However, The EMI signals excited by multiple coexisted faults combining with other unknown noises surrounding the substation often cause the failure of detection. Therefore, the observed EMI signals rather complex and cannot be used directly. To address this problem, the separation of individual signatures from the mixture is posed as an SCBSS problem. To extract the induced signal, an EEMD-based EMI method is proposed. The desired signal is then reconstructed to visualize the structure of the grounding grids by a virtual instrument that consists of DAQ and digital signal processing modules. The numerical simulation and practical experiments are employed. The results show the proposed method can be used to effectively detect the topological structure of grounding grid in real substations' electromagnetic environment.INDEX TERMS Grounding grid, electromagnetic induction (EMI), ensemble empirical mode decomposition (EEMD), single channel blind source separation (SCBSS), nondestructive testing (NDT).

show abstract

Section: B Frame Diagram Of the Ndt Systemmentioning

confidence: 69%

An EEMD-Based Electromagnetic Induction Method for Nondestructive Testing of Buried Metal Conductors

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…In different regions, soil resistivity is different, and the difference in soil moisture content will also lead to changes in resistivity [9]. Therefore, it is necessary to analyze the change of magnetic induction intensity on the surface of the grounding grid under different soil structures.…”

Section: Influence Of Soil Structure On Magnetic Induction Intensitymentioning

confidence: 99%

“…At the same time, the complex electromagnetic interference problem of the substation must be solved. This paper adopts the non-destructive testing method of grounding grid based on electromagnetic method [8,9].…”

Section: Introductionmentioning

confidence: 99%

Application of Digital Lock-in Amplifier in Complex Electromagnetic Interference of Substation

J.S.Song¹,

Song²,

Yang³

et al. 2020

PIER C

Self Cite

View full text Add to dashboard Cite

There is complex electromagnetic interference in the substation. In order to improve detection accuracy, a digital lock-in amplifier is used in the detection of the grounding grid. This paper introduces the principle of non-destructive testing of grounding grid based on electromagnetic method. Firstly, the distribution characteristics of surface magnetic induction intensity at different frequencies are obtained by CDEGS simulation. At the same time, it describes the principle and structure of an orthogonal vector type digital lock-in amplifier in detail. In order to realize the high-precision grounding grid detection system, the hardware circuit of the digital lock-in amplifier is designed by FPGA and analog-to-digital converter. The digital lock-in amplifier algorithm is implemented in the FPGA. Finally, the digital lock-in amplifier is tested. The test results show that when the signal-to-noise ratio of the signal to be tested is −20 dB, the signal amplitude measurement error is less than 3%. The designed digital lock-in amplifier is applied to the actual grounding grid detection, and the topology and corrosion of the grounding network can be detected. Therefore, the digital lock-in amplifier can be effectively applied to non-destructive testing of grounding grid.

show abstract

Non-destructive testing method for substation grounding grid based on electromagnetic method

Yang

Dong

Song

2019

2019 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)

View full text Add to dashboard Cite

A virtual instrument for diagnosis to substation grounding grids in harsh electromagnetic environment

Cited by 3 publications

References 11 publications

An EEMD-Based Electromagnetic Induction Method for Nondestructive Testing of Buried Metal Conductors

An EEMD-Based Electromagnetic Induction Method for Nondestructive Testing of Buried Metal Conductors

Application of Digital Lock-in Amplifier in Complex Electromagnetic Interference of Substation

Non-destructive testing method for substation grounding grid based on electromagnetic method

Contact Info

Product

Resources

About