The Experts below are selected from a list of 33 Experts worldwide ranked by ideXlab platform
Cancan Huang - One of the best experts on this subject based on the ideXlab platform.
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Selection and protection of Earthing Transformer
2019 4th International Conference on Intelligent Green Building and Smart Grid (IGBSG), 2019Co-Authors: Shengxi Dong, Mengbo Li, Cancan HuangAbstract:This paper introduces the application trend of small resistance grounding system, explains the selection and protection methods of Earthing Transformer, and demonstrates the calculation process with an engineering example.
Hayden Sherwood - One of the best experts on this subject based on the ideXlab platform.
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practical fault simulation on an Earthing Transformer using sfra a unique analysis approach towards simplifying sfra results to assist with deformation diagnosis in Earthing Transformers
Sherwood Hayden (2017) Practical fault simulation on an earthing transformer using SFRA: A unique analysis approach towards simplifying SFRA results t, 2017Co-Authors: Hayden SherwoodAbstract:Earthing Transformers are an integral part of power and distribution systems around the world, although, little consideration is given to their ongoing monitoring and maintenance. The failure of an Earthing Transformer can cause a multitude of issues including compromised stability and safety of the electrical network. The necessity to maintain both safety and stability of electrical networks highlights valuable real world applications for an SFRA Earthing Transformer testing toolkit. As a starting point, the project adopted a review of existing research along with an analysis of Earthing Transformer design principles. Research found that because of an inherent design strategy, many ZN wound Earthing Transformers have a unique failure type in common; axial displacement of the inner and outer windings. The second project stage involved physical simulation of an Earthing Transformer’s axial windings displacement using SFRA as a diagnosis tool. Simulation results provided evidence that (for the given test subject) defect detection is possible using SFRA benchmarked comparisons. Analysis of benchmarked comparisons found deviation only at select resonances with general spectral shape retention for all other points along the SFRA trace. Spectral consistency of benchmarked comparisons allowed the implementation of a speech processing technique known as Mel-Frequency Cepstral Coefficients (MFCC). An adaption of the MFCC process introduced a way of encoding and distilling the SFRA trace data while exaggerating critical points of deviation. The third major project stage involved the development of code using Mathworks MATLAB as a platform to the fulfil data management and computational requirements of the adapted MFCC. Select variables were isolated throughout the code to ensure that the process was tune-able on multiple levels for future optimisation. By selecting and mapping the appropriate resultant cepstral coefficients against each other, it was found that a meaningful representation of the SFRA trace can be graphically presented as a single point on a two-dimensional plot. Simulated Transformer defect scenarios had notable deviation on both the x and y axis when processed and plotted together. Analysis, processing and comparison of 28 different Earthing Transformer SFRA traces found possible real world applications for a single point spectrum classifier. The spectrum classifier was proposed as a substitution for pre-existing subjective analysis techniques, potentially building on the communal engineering toolbox for SFRA analysis.
Gao Zhi-peng - One of the best experts on this subject based on the ideXlab platform.
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A method of fault line selection and fault point location with half-wave DC injection in distribution network
Power System Protection and Control, 2020Co-Authors: Gao Zhi-pengAbstract:The problem of fault line selection and location in non-effective earthed power system has not been perfectly solved because of small value of characteristic of criterion. Concerning enlarging the value of characteristic of criterion, a larger half-wave DC is injected to the fault distribution system through the primary neutral point of Earthing Transformer, based on the character of neutral voltage changes during pre-fault and post-fault period. The injected half-wave DC is used as the criterion. The principle of half-wave DC injection and its critical fault resistance are analyzed in detail. The analysis result shows the injected half-wave DC will not change the operation of distribution network and the value of injected half-wave DC can be calculated depending on the desired detecting accuracy of half-wave DC. It also shows that the half-wave DC injection method has a high tolerant capacity towards fault resistance both in isolated neutral system and resonant grounded system. Such equipment has been implemented for more than two years in power networks, and the result of detecting fault line is correct.
Shengxi Dong - One of the best experts on this subject based on the ideXlab platform.
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Selection and protection of Earthing Transformer
2019 4th International Conference on Intelligent Green Building and Smart Grid (IGBSG), 2019Co-Authors: Shengxi Dong, Mengbo Li, Cancan HuangAbstract:This paper introduces the application trend of small resistance grounding system, explains the selection and protection methods of Earthing Transformer, and demonstrates the calculation process with an engineering example.
Wang Na - One of the best experts on this subject based on the ideXlab platform.
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Single-phase Earthing line selection based on first-harmonic current injection
2020Co-Authors: Wang NaAbstract:Because of the influence of network structure,climate and introducation of compensating equipment,the single-phase Earthing line selection of system with ungrounded neutral became more complicated.In this paper,the grounded zero sequence current is to be constant through first-harmonic current injection with Earthing Transformer or auxiliary winding of arc suppression coil.Through first-harmonic current injection,the criterion of zero sequence overcurrent becomes effective to solve the difficult problem of the low correctness of Earthing line selection.
