A Non-Destructive Testing Method for Fault Detection of Substation Grounding Grids

Wang, Xiujuan; Fu, Zhihong; Wang, Yao; Liu, Renkuan; Chen, Lin

doi:10.3390/s19092046

Cited by 21 publications

(21 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Yu et al, diagnosed the breakpoints by injecting current into the grounding grids' wire loop and analyzing the electromagnetic response 19 . Wang et al, proposed a grounding grids detection method based on magnetic source excitation 20 . Wang et al, proposed a new diagnosis index, called grounding conductor soundness, to diagnose the grounding grid's fault type and location accurately 21 .…”

Section: Introductionmentioning

confidence: 99%

Fault diagnosis and location of electrified railway grounding grids based on intelligent algorithm

Chen

Liu

Zhao

et al. 2020

Int Trans Electr Energ Syst

View full text Add to dashboard Cite

Faults in electrified railway grounding grids can lead to significant surface potential rise, which threatens railway transportation and operation security. In order to efficiently diagnose the grounding status of the grounding grid and locate the fault location, this paper firstly presents the development of a mathematical model to reveal the earth surface potential distribution of grounding grids. Furthermore, a simulation model is built specifically for this study using CDEGS software to calculate the earth surface potential distribution of grounding grids under fault conditions. The simulation model has been used to validate the developed mathematical model by a comparison study. Finally, an intelligent algorithm based on grey incidence degree and fuzzy theory is proposed. This algorithm facilitates the fault condition diagnosis and the fault conductor position location. Using the fault condition data calculated by the simulation model, a few common grounding grids' fault conditions are diagnosed and located effectively by the proposed method. The results identify that the proposed method can ensure the safe operation of the traction substation.

show abstract

Section: Introductionmentioning

confidence: 99%

Fault diagnosis and location of electrified railway grounding grids based on intelligent algorithm

Chen

Liu

Zhao

et al. 2020

Int Trans Electr Energ Syst

View full text Add to dashboard Cite

show abstract

“…Nondestructive testing is a highly valuable technique that can simultaneously reduce cost and save time in product evaluation, troubleshooting and research because it does not alter the targeted objects during the inspection. It has a wide variety of applications such as power systems [ 29 ], aerospace [ 30 ] and robotics [ 31 ]. Noncontact testing is gaining prominence for nondestructive testing due to its feasibility without physical contact.…”

Section: Introductionmentioning

confidence: 99%

Infrared Thermography Measurement for Vibration-Based Structural Health Monitoring in Low-Visibility Harsh Environments

Liu²,

Chung³

et al. 2020

Sensors

View full text Add to dashboard Cite

In this study, infrared thermography is used for vibration-based structural health monitoring (SHM). Heat sources are employed as sensors. An acrylic frame structure was experimentally investigated using the heat sources as structural marker points to record the vibration response. The effectiveness of the infrared thermography measurement system was verified by comparing the results obtained using an infrared thermal imager with those obtained using accelerometers. The average error in natural frequency was between only 0.64% and 3.84%. To guarantee the applicability of the system, this study employed the mode shape curvature method to locate damage on a structure under harsh environments, for instance, in dark, hindered, and hazy conditions. Moreover, we propose the mode shape recombination method (MSRM) to realize large-scale structural measurement. The partial mode shapes of the 3D frame structure are combined using the MSRM to obtain the entire mode shape with a satisfactory model assurance criterion. Experimental results confirmed the feasibility of using heat sources as sensors and indicated that the proposed methods are suitable for overcoming the numerous inherent limitations associated with SHM in harsh or remote environments as well as the limitations associated with the SHM of large-scale structures.

show abstract

“…In a power system, the grounding grid plays a key role in protecting the safety of the power system's operation and the lives of workers. It provides a reference ground for the power system and quickly drains lightning current and fault current, reduces the ground potential rise, and guarantees equipment and personnel safety [1,2]. With the development of the power system, ultra-high voltage (UHV) large capacity substation has become a trend.…”

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

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

A Non-Destructive Testing Method for Fault Detection of Substation Grounding Grids

Cited by 21 publications

References 24 publications

Fault diagnosis and location of electrified railway grounding grids based on intelligent algorithm

Fault diagnosis and location of electrified railway grounding grids based on intelligent algorithm

Infrared Thermography Measurement for Vibration-Based Structural Health Monitoring in Low-Visibility Harsh Environments

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

Contact Info

Product

Resources

About