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Optimization Design of Grounding Grid for Hengshui District

Author: WangNing
Tutor: LiBaoShu；LiHongLu
School: North China Electric Power University
Course: Electrical Engineering
Keywords: Grounding grid Optimization Low soil resistivity Step voltage
CLC: TM862
Type: Master's thesis
Year: 2011
Downloads: 34
Quote: 0
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Abstract


Grounding grid has an important role to maintain safe and reliable operation of power system , to protect the safety of the operating personnel . Its most important function is to safely fault current into an underground , limiting the fault potential rise to control surface potential gradient to limit step and touch voltage to a safe value . The Grounding performance has been subject to the attention of the department of design and production run . Characteristics for the Hengshui area soil resistivity low grounding resistance , surface potential rise in line with the standard limit required under the premise assurance step and touch voltage is not excessive , the use of non - uniform grid design ground grid method application of interpolation and curve fitting surface potential data based on the calculation of step and touch voltage . Based on two typical the Hengshui area soil model , assuming that the ground network model to analyze the current injection point , grid spacing , depth, ground network of ground network fillets , the surface partial Shop gravel , and walls , and other factors on the ground grid electrical the impact of the parameters . Can be combined with the actual situation in the engineering design , the application of the law to improve the grounding grid electrical performance . The design characteristics of the Hengshui area soil resistivity low minimum total length of steel as the optimization objective , at the same time step and touch voltage does not exceed the limit , using the optimal compression ratio design ground grid . The combination of Hengshui actual summarizes the ground grid design ideas , and comparing the electrical parameters of the uniform and non-uniform grid grounding grid . Select a Hengshui area the uneven grid ground grid design for the testing of the electrical parameters of the test , and compared with the calculation results verify the correctness and uneven grid design ground grid feasibility of the calculation results .

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CLC: > Industrial Technology > Electrotechnical > High Voltage Engineering > Overvoltage and Its Protection > Over-voltage protection devices
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