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Zhihong Fu
School of Electrical EngineeringChongqing University No. 174 Shazhengjie Chongqing 400044 China

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Original article
Published: 22 July 2020 in Geophysical Prospecting
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Tunnel seismic prediction is widely used in the field of tunnel seismic advance detection. The illumination of the target and the signal‐to‐noise ratio of the data are two key factors affecting the precision of data interpretation. Current seismic prospecting has shortcomings on sites: (1) The lighting shots are solely toward one side of the tunnel wall; (2) The geophones are placed far away from the tunnel face; (3) The surface waves from the tunnel wall dominate over the reflection waves, lowering the signal‐to‐noise ratio of the data at the tunnel wall. This paper proposes a tunnel symmetrical geometry to tackle the above challenges. The arrangement is to place 12 sources uniformly on each side of the tunnel wall and six geophones on the tunnel wall and face. Results of simulated data and measured data show that the proposed method enables (1) broad illumination of the target body, (2) the enhancement of illumination energy of the target body, and (3) higher data signal‐to‐noise ratio. The proposed symmetrical geometry method provides better interpretation in terms of broader coverage, higher quality, and greater distance of investigation. This article is protected by copyright. All rights reserved

ACS Style

Xinglin Lu; Xian Liao; Yao Wang; Guimei Wang; Zhihong Fu; Hengming Tai. The tunnel seismic advance prediction method with wide illumination and a high signal‐to‐noise ratio. Geophysical Prospecting 2020, 68, 1 .

AMA Style

Xinglin Lu, Xian Liao, Yao Wang, Guimei Wang, Zhihong Fu, Hengming Tai. The tunnel seismic advance prediction method with wide illumination and a high signal‐to‐noise ratio. Geophysical Prospecting. 2020; 68 (8):1.

Chicago/Turabian Style

Xinglin Lu; Xian Liao; Yao Wang; Guimei Wang; Zhihong Fu; Hengming Tai. 2020. "The tunnel seismic advance prediction method with wide illumination and a high signal‐to‐noise ratio." Geophysical Prospecting 68, no. 8: 1.

Journal article
Published: 17 January 2020 in Sensors
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As an electromagnetic field conversion tool in the transient electromagnetic method (TEM), the weak coupling coils reduce the mutual inductance of its transmitter and receiver coils by special structural optimization, so the detection signal can be protruded from the primary field interference generated by the transmitter coil; thus, this kind of coil design can significantly improve the signal-to-noise ratio. However, with the popularity of drag or aerial TEM exploration, the structural stability problem caused by bumps or windage leads to non-negligible primary field leakages, thereby reducing the detection reliability. This paper incorporates the primary field shielding stability as a key indicator of the weak coupling designs and proposes a calibration scheme for this stability assessment, based on which the shielding stability of five typical weak coupling coil designs is quantitatively compared, and the relationship between the primary field density and the shielding stability explored in this study may contribute to the selection and improvement of TEM coils.

ACS Style

Jiangbo Huang; Haowen Wang; Zhihong Fu; Wei Fu. Analysis of Primary Field Shielding Stability for the Weak Coupling Coil Designs. Sensors 2020, 20, 519 .

AMA Style

Jiangbo Huang, Haowen Wang, Zhihong Fu, Wei Fu. Analysis of Primary Field Shielding Stability for the Weak Coupling Coil Designs. Sensors. 2020; 20 (2):519.

Chicago/Turabian Style

Jiangbo Huang; Haowen Wang; Zhihong Fu; Wei Fu. 2020. "Analysis of Primary Field Shielding Stability for the Weak Coupling Coil Designs." Sensors 20, no. 2: 519.

Journal article
Published: 30 December 2019 in Electronics
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The distribution of the permafrost in the Tibetan Plateau has dramatically changed due to climate change, expressed as increasing permafrost degradation, thawing depth deepening and disappearance of island permafrost. These changes have serious impacts on the local ecological environment and the stability of engineering infrastructures. Ground penetrating radar (GPR) is used to detect permafrost active layer depth, the upper limit of permafrost and the thawing of permafrost with the season’s changes. Due to the influence of complex structure in the permafrost layer, it is difficult to effectively characterize the accurate structure within the permafrost on the radar profile. In order to get the high resolution GPR profile in the Tibetan Plateau, the reverse time migration (RTM) imaging method was applied to GPR real data. In this paper, RTM algorithm is proven to be correct through the groove’s model of forward modeling data. In the Beiluhe region, the imaging result of GPR RTM profiles show that the RTM of GPR makes use of diffracted energy to properly position the reflections caused by the gravels, pebbles, cobbles and small discontinuities. It can accurately determine the depth of the active layer bottom interface in the migration section. In order to prove the accuracy of interpretation results of real data RTM section, we set up the three dielectric constant models based on the real data RTM profiles and geological information, and obtained the model data RTM profiles, which can prove the accuracy of interpretation results of three-line RTM profiles. The results of three-line RTM bears great significance for the study of complex structure and freezing and thawing process of permafrost at the Beiluhe region on the Tibetan Plateau.

ACS Style

Yao Wang; Zhihong Fu; Xinglin Lu; Shanqiang Qin; Haowen Wang; Xiujuan Wang. Imaging of the Internal Structure of Permafrost in the Tibetan Plateau Using Ground Penetrating Radar. Electronics 2019, 9, 56 .

AMA Style

Yao Wang, Zhihong Fu, Xinglin Lu, Shanqiang Qin, Haowen Wang, Xiujuan Wang. Imaging of the Internal Structure of Permafrost in the Tibetan Plateau Using Ground Penetrating Radar. Electronics. 2019; 9 (1):56.

Chicago/Turabian Style

Yao Wang; Zhihong Fu; Xinglin Lu; Shanqiang Qin; Haowen Wang; Xiujuan Wang. 2019. "Imaging of the Internal Structure of Permafrost in the Tibetan Plateau Using Ground Penetrating Radar." Electronics 9, no. 1: 56.

Journal article
Published: 29 August 2019 in Sensors
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The tunnel seismic method allows for the detection of the geology in front of a tunnel face for the safety of tunnel construction. Conventional geophones have problems such as a narrow spectral width, low sensitivity, and poor coupling with the tunnel wall. To tackle issues above, we propose a semi-automatic coupling geophone equipped with a piezoelectric sensor with a spectral range of 10-5000 Hz and a sensitivity of 2.8 V/g. After the geophone was manually pushed into the borehole, it automatically coupled with the tunnel wall under the pressure of the springs within the device. A comparative experiment showed that the data spectrum acquired by the semi-automatic coupling geophone was much higher than that of the conventional geophone equipped with the same piezoelectric sensor. The seismic data were processed in combination with forward modeling. The imaging results also show that the data acquired by the semi-automatic coupling geophone were more in line with the actual geological conditions. In addition, the semi-automatic coupling geophone's installation requires a lower amount of time and cost. In summary, the semi-automatic coupling geophone is able to efficiently acquire seismic data with high fidelity, which can provide a reference for tunnel construction safety.

ACS Style

Yao Wang; Nengyi Fu; Zhihong Fu; Xinglin Lu; Xian Liao; Haowen Wang; Shanqiang Qin. A Semi-Automatic Coupling Geophone for Tunnel Seismic Detection. Sensors 2019, 19, 3734 .

AMA Style

Yao Wang, Nengyi Fu, Zhihong Fu, Xinglin Lu, Xian Liao, Haowen Wang, Shanqiang Qin. A Semi-Automatic Coupling Geophone for Tunnel Seismic Detection. Sensors. 2019; 19 (17):3734.

Chicago/Turabian Style

Yao Wang; Nengyi Fu; Zhihong Fu; Xinglin Lu; Xian Liao; Haowen Wang; Shanqiang Qin. 2019. "A Semi-Automatic Coupling Geophone for Tunnel Seismic Detection." Sensors 19, no. 17: 3734.

Journal article
Published: 15 August 2019 in Sensors
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The multi-coil sensor consisting of a series of sub-coils provides a reliable way to avoid signal distortion from excitation field. Compared with conventional coil sensors, the multi-coil sensor exhibits more complex signal conversion performance, and the conventional equivalent circuit cannot reveal the possible attenuated oscillation, which seriously degrades the detection reliability. Based on a novel equivalent circuit model, this research investigates the causes of signal oscillation and proposes and validates an effective solution, which contributes to the signal transmission characteristics of multi-coil sensors for engineering applications.

ACS Style

Jiangbo Huang; Haowen Wang; Zhihong Fu; Wei Fu. Modeling and Solution of Signal Oscillation Mechanism of the Multi-Coil Sensor. Sensors 2019, 19, 3563 .

AMA Style

Jiangbo Huang, Haowen Wang, Zhihong Fu, Wei Fu. Modeling and Solution of Signal Oscillation Mechanism of the Multi-Coil Sensor. Sensors. 2019; 19 (16):3563.

Chicago/Turabian Style

Jiangbo Huang; Haowen Wang; Zhihong Fu; Wei Fu. 2019. "Modeling and Solution of Signal Oscillation Mechanism of the Multi-Coil Sensor." Sensors 19, no. 16: 3563.

Journal article
Published: 06 June 2019 in Electronics
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In this paper, a novel AC magnetic transmitter current source circuit is proposed for application of frequency domain electromagnetic method (FEM) prospecting. The proposed current source circuit is capable of generating high frequency and high constant amplitude currents, which are key technical problems for FEM. It is suitable for very wide frequencies. The main circuit of the proposed current source consists of a rising-edge enhancing unit, a constant current control unit, and a high voltage clamping unit. Large constant clamping voltage is applied during the rising edge and the falling edge of the alternating square current to obtain a high frequency and high linearity current source. On the current flat stage, the constant current unit provides the energy to the load to ensure the constant amplitude of the output current. Detailed operations of the proposed magnetic current source are given. Simulation and experimental results demonstrate that the proposed circuit achieves short reversal time, the linearity of the rising/falling edge, constant amplitude and low power loss. These are the desired characteristics of the ac square current source probing transmitter for the magnetic FEM applications.

ACS Style

Xiujuan Wang; Zhihong Fu; Yao Wang; Wendong Wang; Wei Liu; Junli Zhao. A Wide-Frequency Constant-Amplitude Transmitting Circuit for Frequency Domain Electromagnetic Detection Transmitter. Electronics 2019, 8, 640 .

AMA Style

Xiujuan Wang, Zhihong Fu, Yao Wang, Wendong Wang, Wei Liu, Junli Zhao. A Wide-Frequency Constant-Amplitude Transmitting Circuit for Frequency Domain Electromagnetic Detection Transmitter. Electronics. 2019; 8 (6):640.

Chicago/Turabian Style

Xiujuan Wang; Zhihong Fu; Yao Wang; Wendong Wang; Wei Liu; Junli Zhao. 2019. "A Wide-Frequency Constant-Amplitude Transmitting Circuit for Frequency Domain Electromagnetic Detection Transmitter." Electronics 8, no. 6: 640.

Review
Published: 03 June 2019 in Applied Sciences
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The grounding device plays performs the role of releasing a lightning current and a fault current in the power system, and the corrosion of the conductor will cause damage to the grounding body, which threatens the safe operation of the power system. The grounding grid corrosion detection technology and equipment guarantee the safe operation of the power system. This paper discusses the research status of grounding corrosion and topological detection in detail and introduces the basic principles, research difficulties and existing problems of the methods such as the electric network method, electromagnetic field method, electrochemical method, ultrasonic detection method and electromagnetic imaging method. The methods of electromagnetic imaging and time difference positioning proposed in recent years have been also discussed in detail. The paper points out that the application of grounding grid corrosion detection distance engineering still faces great challenges and that multi-disciplinary, multi-information fusion, new sensing technology, big data platforms and intelligent computing will be the trends to follow in research on grounding grid fault, corrosion detection and life prediction.

ACS Style

Zhihong Fu; Xiujuan Wang; Qian Wang; Xiaobin Xu; Nengyi Fu; Shanqiang Qin; Wang; Xu; Fu; Qin. Advances and Challenges of Corrosion and Topology Detection of Grounding Grid. Applied Sciences 2019, 9, 2290 .

AMA Style

Zhihong Fu, Xiujuan Wang, Qian Wang, Xiaobin Xu, Nengyi Fu, Shanqiang Qin, Wang, Xu, Fu, Qin. Advances and Challenges of Corrosion and Topology Detection of Grounding Grid. Applied Sciences. 2019; 9 (11):2290.

Chicago/Turabian Style

Zhihong Fu; Xiujuan Wang; Qian Wang; Xiaobin Xu; Nengyi Fu; Shanqiang Qin; Wang; Xu; Fu; Qin. 2019. "Advances and Challenges of Corrosion and Topology Detection of Grounding Grid." Applied Sciences 9, no. 11: 2290.

Journal article
Published: 02 May 2019 in Sensors
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The grounding grid is critical to the safety and stability of a power system. Corrosive cracking of the grounding conductor is the main cause of deterioration of grounding grid performance. Existing fault diagnosis methods for grounding grids are limited by the number and distribution of grounding leads, and some of them cannot be used for online detection. This paper proposes a grounding grid detection method based on magnetic source excitation. The measuring device consists of four coils, two horizontal excitation coils, and two vertical receiving coils. The secondary magnetic field signal is extracted from the primary field and the background field by properly positioning the coils, such that the measured signal can reflect the underground media more accurately. The measuring device of the method is portable, the measurement process is contactless with the grounding grid, and it is not limited by the grounding leads. Furthermore, it has a strong anti-interference ability and can realize online detection. It was proven by simulations and experiments that the proposed method has a higher measurement accuracy and stronger anti-interference ability when compared with existing methods. This paper also discusses the influence of various factors such as the number and the location of the breakpoints, the frequency of the excitation source, the soil resistivity, and stratification from the measurement data. It was proven that the method has high precision and a wide application range, and is important for guiding significance and reference value in engineering applications.

ACS Style

Xiujuan Wang; Zhihong Fu; Yao Wang; Renkuan Liu; Lin Chen. A Non-Destructive Testing Method for Fault Detection of Substation Grounding Grids. Sensors 2019, 19, 2046 .

AMA Style

Xiujuan Wang, Zhihong Fu, Yao Wang, Renkuan Liu, Lin Chen. A Non-Destructive Testing Method for Fault Detection of Substation Grounding Grids. Sensors. 2019; 19 (9):2046.

Chicago/Turabian Style

Xiujuan Wang; Zhihong Fu; Yao Wang; Renkuan Liu; Lin Chen. 2019. "A Non-Destructive Testing Method for Fault Detection of Substation Grounding Grids." Sensors 19, no. 9: 2046.

Journal article
Published: 12 March 2019 in Sensors
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Seismic imaging is the most effective geophysical method and has been extensively implemented to detect potential geological hazards in tunnels during construction. The coupling of geophones and the design of geometry in tunnels are the two major challenges. To ensure successful coupling, a high-sensitivity semi-automatic coupling geophone with a broadband was designed. In practice, this geophone is attached with a wheel and two springs. Once inserted into the borehole, an automatic coupling action occurs. This semi-automatic coupling design within the geophone not only guarantees good coupling, but reduces the time and costs usually required to install a traditional geophone. In the use of geophones for tunnel seismic detection, we propose two new two-dimensional (2D) seismic geometries based on the two commonly used geometries. A test to assess the effectiveness of the qualities of imaging from four geometries was completed by comparing the results of the forward modeling of sandwich models. The conclusion is that the larger the horizontal offset of the layout geometry, the higher the resolution of the imaging; the larger the vertical offset, the weaker the mirror image. The vertical offset is limited due to the narrow tunnel condition. Therefore, the mirror effect cannot be entirely eliminated; however, it can be further suppressed by constructing 2D geometry. The two newly proposed 2D geometries caused the imaging arc of the inter-layer, but suppressed the mirror image. The mirror image added a significant number of errors to the data, which could misguide tunnel construction; therefore the new 2D geometries are more reasonable than the two most commonly used. We applied one of the two new 2D geometries that was more practical to an actual project, the Chongqing Jinyunshan Tunnel in China, and acquired high-quality seismic data using two semi-automatic coupling geophones. The detection results were essentially consistent with the excavation conclusions.

ACS Style

Yao Wang; Nengyi Fu; Xinglin Lu; Zhihong Fu. Application of a New Geophone and Geometry in Tunnel Seismic Detection. Sensors 2019, 19, 1246 .

AMA Style

Yao Wang, Nengyi Fu, Xinglin Lu, Zhihong Fu. Application of a New Geophone and Geometry in Tunnel Seismic Detection. Sensors. 2019; 19 (5):1246.

Chicago/Turabian Style

Yao Wang; Nengyi Fu; Xinglin Lu; Zhihong Fu. 2019. "Application of a New Geophone and Geometry in Tunnel Seismic Detection." Sensors 19, no. 5: 1246.

Journal article
Published: 26 January 2018 in IEEE Transactions on Magnetics
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A wavelet edge detection method is introduced to image the topology of grounding grids and locate the grounding conductors from measured magnetic induction. Theoretical analysis of the magnetic field and calculation method of discrete wavelet transform are described. Since the sharpest variation of the magnetic field perpendicular to the ground surface occurs right above a conductor, the gradient vector modulus maximum of the vertical component can be calculated to extract the position information about the conductor. This scheme is derived from the Canny edge detection. A 2-D discrete à trous algorithm is used to perform equivalent edge detection as the wavelet transform avoids partial derivative. The method is robust to noise and would extract more stable and distinct edge. Extensive simulation and experimental examples demonstrate that the proposed method can accurately draw the topology of grounding grids and locate the conductors.

ACS Style

Zhihong Fu; Siyu Song; Xiujuan Wang; Junqiang Li; Heng-Ming Tai. Imaging the Topology of Grounding Grids Based on Wavelet Edge Detection. IEEE Transactions on Magnetics 2018, 54, 1 -8.

AMA Style

Zhihong Fu, Siyu Song, Xiujuan Wang, Junqiang Li, Heng-Ming Tai. Imaging the Topology of Grounding Grids Based on Wavelet Edge Detection. IEEE Transactions on Magnetics. 2018; 54 (4):1-8.

Chicago/Turabian Style

Zhihong Fu; Siyu Song; Xiujuan Wang; Junqiang Li; Heng-Ming Tai. 2018. "Imaging the Topology of Grounding Grids Based on Wavelet Edge Detection." IEEE Transactions on Magnetics 54, no. 4: 1-8.

Journal article
Published: 01 January 2018 in International Journal of Information and Education Technology
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ACS Style

Guangjin Peng; Zhihong Fu; Qian Zhang; Chunyan Li. Design and Practice of EMI Teaching Method in Electric Network Principle Course. International Journal of Information and Education Technology 2018, 8, 223 -226.

AMA Style

Guangjin Peng, Zhihong Fu, Qian Zhang, Chunyan Li. Design and Practice of EMI Teaching Method in Electric Network Principle Course. International Journal of Information and Education Technology. 2018; 8 (3):223-226.

Chicago/Turabian Style

Guangjin Peng; Zhihong Fu; Qian Zhang; Chunyan Li. 2018. "Design and Practice of EMI Teaching Method in Electric Network Principle Course." International Journal of Information and Education Technology 8, no. 3: 223-226.

Journal article
Published: 14 March 2017 in IEEE Transactions on Industrial Electronics
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Optimizing the grounding grid configuration is an effective approach to improve the performance of grounding grid. On the other hand, configuration of grounding grid is necessary for some defect diagnosis method to detect the faults existing in grounding conductors. This paper employs the transient electromagnetic (TEM) method to draw the configuration of a substation grounding grid. The surface magnetic field is recorded by receiver coils above the grounding grid. Based on the regular distribution characteristics of a recorded magnetic field, the grounding conductor is accurately located from the curve of magnetic intensity. The complete process of configuration detection of the grounding grid is described in detail. After fast inversion calculation of the recorded magnetic field, the equivalent resistivity is obtained. The configuration of the grounding grid will be clearly and accurately shown in the contour map and three-dimensional (3-D) surface map of equivalent resistivity. Model study is performed, and a field test is also conducted. The results are in good agreement to demonstrate the effectiveness of TEM method for configuration detection of the substation grounding grid.

ACS Style

Cigong Yu; Zhihong Fu; Gaolin Wu; Liuyuan Zhou; Xuegui Zhu; Minghui Bao. Configuration Detection of Substation Grounding Grid Using Transient Electromagnetic Method. IEEE Transactions on Industrial Electronics 2017, 64, 6475 -6483.

AMA Style

Cigong Yu, Zhihong Fu, Gaolin Wu, Liuyuan Zhou, Xuegui Zhu, Minghui Bao. Configuration Detection of Substation Grounding Grid Using Transient Electromagnetic Method. IEEE Transactions on Industrial Electronics. 2017; 64 (8):6475-6483.

Chicago/Turabian Style

Cigong Yu; Zhihong Fu; Gaolin Wu; Liuyuan Zhou; Xuegui Zhu; Minghui Bao. 2017. "Configuration Detection of Substation Grounding Grid Using Transient Electromagnetic Method." IEEE Transactions on Industrial Electronics 64, no. 8: 6475-6483.

Journal article
Published: 15 June 2015 in IEEE Transactions on Industry Applications
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Service lifetime estimation for earth grounding grids as a problem or a task faced by the industry is presented. A mathematical model based on Freschi's semianalytical model to determine the performance of the earth grounding grid at a certain year after being buried is proposed. The mathematical model can also explain the performance degradation of the earth grounding grid in principle and mathematically. According to the model, a scheme to estimate the service life of the earth grounding grid is proposed. A case study is given to illustrate how the scheme works. If the estimated service life of an earth grounding grid is not satisfactory, some measures, such as cathodic protection, should be considered to extend the service lifetime of the earth grounding grid.

ACS Style

Shengxin Huang; Zhihong Fu; Qian Wang; Xuegui Zhu; Shanqiang Qin. Service Life Estimation for the Small- and Medium-Sized Earth Grounding Grids. IEEE Transactions on Industry Applications 2015, 51, 5442 -5451.

AMA Style

Shengxin Huang, Zhihong Fu, Qian Wang, Xuegui Zhu, Shanqiang Qin. Service Life Estimation for the Small- and Medium-Sized Earth Grounding Grids. IEEE Transactions on Industry Applications. 2015; 51 (6):5442-5451.

Chicago/Turabian Style

Shengxin Huang; Zhihong Fu; Qian Wang; Xuegui Zhu; Shanqiang Qin. 2015. "Service Life Estimation for the Small- and Medium-Sized Earth Grounding Grids." IEEE Transactions on Industry Applications 51, no. 6: 5442-5451.

Journal article
Published: 15 June 2015 in IEEE Transactions on Industry Applications
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Faults of grounding grids are threat to the safety of power system and cause significant economic loss every year in China. Accurate detection of the faults will alleviate these detrimental effects. This paper presents a novel approach using the transient electromagnetic method for fault diagnosis of grounding grids. The induced magnetic intensity is collected by receiver coils in the form of electromotive force. After inversion calculation, the contour map of equivalent resistivity of underground covered by grids is obtained. The faults due to corrosion or break can be accurately located from the distribution characteristics of equivalent resistivity maps. The influence of the fault of different degrees, material of grounding conductor, and soil resistivity on distribution of induced magnetic intensity to fault diagnosis will be analyzed in detail. The effect of the underground pipeline on fault diagnosis of grounding grids is also investigated. Simulation was performed, and a field experiment was conducted to verify the effectiveness of the proposed method.

ACS Style

Cigong Yu; Zhihong Fu; Qian Wang; Heng-Ming Tai; Shanqiang Qin. A Novel Method for Fault Diagnosis of Grounding Grids. IEEE Transactions on Industry Applications 2015, 51, 1 -1.

AMA Style

Cigong Yu, Zhihong Fu, Qian Wang, Heng-Ming Tai, Shanqiang Qin. A Novel Method for Fault Diagnosis of Grounding Grids. IEEE Transactions on Industry Applications. 2015; 51 (6):1-1.

Chicago/Turabian Style

Cigong Yu; Zhihong Fu; Qian Wang; Heng-Ming Tai; Shanqiang Qin. 2015. "A Novel Method for Fault Diagnosis of Grounding Grids." IEEE Transactions on Industry Applications 51, no. 6: 1-1.

Journal article
Published: 13 February 2015 in IEEE Transactions on Power Delivery
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Faults in the grounding grid are a hidden danger to the safety of power systems and cause significant economic loss every year. This paper presents a new means to locate faults in grounding grids using the transient electromagnetic imaging method. The method compares the distribution characteristics of the equivalent resistivity of the underground covered by grids for the no-fault case and those with break points. We describe why and how the proposed method can be used for the break-point diagnosis of grounding grids. Simulation was performed using the Ansoft finite-element method package, and a field experiment was conducted to verify the effectiveness of the proposed method. This study provides a practical means for break-point diagnosis with no requirement of power shut down or soil excavation. Moreover, the proposed method does not require the design drawings of grounding grids.

ACS Style

Cigong Yu; Zhihong Fu; Xingzhe Hou; Heng-Ming Tai; Xiangfeng Su. Break-Point Diagnosis of Grounding Grids Using Transient Electromagnetic Apparent Resistivity Imaging. IEEE Transactions on Power Delivery 2015, 30, 2485 -2491.

AMA Style

Cigong Yu, Zhihong Fu, Xingzhe Hou, Heng-Ming Tai, Xiangfeng Su. Break-Point Diagnosis of Grounding Grids Using Transient Electromagnetic Apparent Resistivity Imaging. IEEE Transactions on Power Delivery. 2015; 30 (6):2485-2491.

Chicago/Turabian Style

Cigong Yu; Zhihong Fu; Xingzhe Hou; Heng-Ming Tai; Xiangfeng Su. 2015. "Break-Point Diagnosis of Grounding Grids Using Transient Electromagnetic Apparent Resistivity Imaging." IEEE Transactions on Power Delivery 30, no. 6: 2485-2491.

Research article
Published: 28 October 2014 in Journal of Applied Mathematics
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The radial basis function (RBF) method, especially the multiquadric (MQ) function, was proposed for one- and two-dimensional nonlinear integral equations. The unknown function was firstly interpolated by MQ functions and then by forming the nonlinear algebraic equations by the collocation method. Finally, the coefficients of RBFs were determined by Newton’s iteration method and an approximate solution was obtained. In implementation, the Gauss quadrature formula was employed in one-dimensional and two-dimensional regular domain problems, while the quadrature background mesh technique originated in mesh-free methods was introduced for irregular situation. Due to the superior interpolation performance of MQ function, the method can acquire higher accuracy with fewer nodes, so it takes obvious advantage over the Gaussian RBF method which can be revealed from the numerical results.

ACS Style

Huaiqing Zhang; Yu Chen; Chunxian Guo; Zhihong Fu. Application of Radial Basis Function Method for Solving Nonlinear Integral Equations. Journal of Applied Mathematics 2014, 2014, 1 -8.

AMA Style

Huaiqing Zhang, Yu Chen, Chunxian Guo, Zhihong Fu. Application of Radial Basis Function Method for Solving Nonlinear Integral Equations. Journal of Applied Mathematics. 2014; 2014 ():1-8.

Chicago/Turabian Style

Huaiqing Zhang; Yu Chen; Chunxian Guo; Zhihong Fu. 2014. "Application of Radial Basis Function Method for Solving Nonlinear Integral Equations." Journal of Applied Mathematics 2014, no. : 1-8.

Research article
Published: 25 September 2014 in Mathematical Problems in Engineering
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The spectral leakage has a harmful effect on the accuracy of harmonic analysis for asynchronous sampling. This paper proposed a time quasi-synchronous sampling algorithm which is based on radial basis function (RBF) interpolation. Firstly, a fundamental period is evaluated by a zero-crossing technique with fourth-order Newton’s interpolation, and then, the sampling sequence is reproduced by the RBF interpolation. Finally, the harmonic parameters can be calculated by FFT on the synchronization of sampling data. Simulation results showed that the proposed algorithm has high accuracy in measuring distorted and noisy signals. Compared to the local approximation schemes as linear, quadric, and fourth-order Newton interpolations, the RBF is a global approximation method which can acquire more accurate results while the time-consuming is about the same as Newton’s.

ACS Style

Huaiqing Zhang; Yu Chen; Zhihong Fu; Ran Liu. Sample Data Synchronization and Harmonic Analysis Algorithm Based on Radial Basis Function Interpolation. Mathematical Problems in Engineering 2014, 2014, 1 -7.

AMA Style

Huaiqing Zhang, Yu Chen, Zhihong Fu, Ran Liu. Sample Data Synchronization and Harmonic Analysis Algorithm Based on Radial Basis Function Interpolation. Mathematical Problems in Engineering. 2014; 2014 ():1-7.

Chicago/Turabian Style

Huaiqing Zhang; Yu Chen; Zhihong Fu; Ran Liu. 2014. "Sample Data Synchronization and Harmonic Analysis Algorithm Based on Radial Basis Function Interpolation." Mathematical Problems in Engineering 2014, no. : 1-7.

Journal article
Published: 18 December 2013 in Geophysical Prospecting
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Distributed parameters of the receiver coils greatly affect transient electromagnetic signals over short time periods, causing a delay in the signal's effective sampling time and the loss of shallow exploration information. This paper investigates the influence of transient process on apparent resistivity calculation and analyses the relations between the error of apparent resistivity and receiver coil design. We find that, under the same effective area, different radii of the receiver coils lead to different levels of impact on the estimation of the apparent resistivity. An optimization model is proposed to determine the optimal receiver coil size that gives rise to the smallest estimation error of the apparent resistivity. The relationship between the optimal radius and the effective areas is developed, which serves as a guideline for the optimal receiver coil design. The results may provide a useful means for improving the accuracy of the small loop transient electromagnetic instrumentation for shallow‐depth mapping.

ACS Style

Cigong Yu; Zhihong Fu; Huaiqing Zhang; Heng-Ming Tai; Xuegui Zhu. Transient process and optimal design of receiver coil for small-loop transient electromagnetics. Geophysical Prospecting 2013, 62, 377 -384.

AMA Style

Cigong Yu, Zhihong Fu, Huaiqing Zhang, Heng-Ming Tai, Xuegui Zhu. Transient process and optimal design of receiver coil for small-loop transient electromagnetics. Geophysical Prospecting. 2013; 62 (2):377-384.

Chicago/Turabian Style

Cigong Yu; Zhihong Fu; Huaiqing Zhang; Heng-Ming Tai; Xuegui Zhu. 2013. "Transient process and optimal design of receiver coil for small-loop transient electromagnetics." Geophysical Prospecting 62, no. 2: 377-384.

Journal article
Published: 01 July 2013 in TELKOMNIKA Indonesian Journal of Electrical Engineering
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A novel three-phase phase-locked loop solution is proposed based on D-Q transformation aiming at the AC-DC rectifier with high efficiency and high power factor. The phase-locked loop is implemented digitally using the Xilinx blockset integrated with Matlab/Simulink. The three-phase digital phase-locked loop (TDPLL) is elaborately designed with the parameters defined in detail. The AC-DC converter (rectifier) model with the TDPLL is built and simulated in the high-speed VHS-ADC simulation platform from Canada. The simulation and test results show the TDPLL is locked right after the different three-phase voltage disturbances and very suitable for control of the rectifier with high parallelism through space vector pulse width modulation (SVPWM).

ACS Style

Xuegui Zhu; Zhihong Fu; Xiangfeng Su. A Novel Unit Power Factor Rectifier Based on Three-phase Digital PLL. TELKOMNIKA Indonesian Journal of Electrical Engineering 2013, 11, 1 .

AMA Style

Xuegui Zhu, Zhihong Fu, Xiangfeng Su. A Novel Unit Power Factor Rectifier Based on Three-phase Digital PLL. TELKOMNIKA Indonesian Journal of Electrical Engineering. 2013; 11 (7):1.

Chicago/Turabian Style

Xuegui Zhu; Zhihong Fu; Xiangfeng Su. 2013. "A Novel Unit Power Factor Rectifier Based on Three-phase Digital PLL." TELKOMNIKA Indonesian Journal of Electrical Engineering 11, no. 7: 1.

Original articles
Published: 21 August 2007 in Electric Power Components and Systems
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In this article, a novel circuit topology of near rectangular current pulse generation suitable for the transient electromagnetic (TEM) applications is proposed. Satisfactory TEM applications, in general, rely upon a TEM transmitter circuit acting as a current excitation source to produce a high-quality primary magnetic field. This requires that the generated current pulse be of short turn-off delay time, with highly linear falling edge, and fast rising edge. The generation of near rectangular bipolar current pulses is very challenging for high-current high-power applications. The proposed TEM transmitter circuit can be considered as a voltage stabilizing clamp current pulse shaper. Its operation principles are described and guidelines for optimal component selection are also provided. Simulation results show that the proposed circuit demonstrates superior performance compared to other TEM transmitter circuit topologies, such as the improved RCD snubber, IEDD, and the quasi-resonant rectifying circuit.

ACS Style

Zhihong Fu; Louwei Zhou; Heng-Ming Tai. Current Pulse Generation for Transient Electromagnetic Applications. Electric Power Components and Systems 2007, 35, 1201 -1218.

AMA Style

Zhihong Fu, Louwei Zhou, Heng-Ming Tai. Current Pulse Generation for Transient Electromagnetic Applications. Electric Power Components and Systems. 2007; 35 (11):1201-1218.

Chicago/Turabian Style

Zhihong Fu; Louwei Zhou; Heng-Ming Tai. 2007. "Current Pulse Generation for Transient Electromagnetic Applications." Electric Power Components and Systems 35, no. 11: 1201-1218.