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Research on the Substation Grounding System and Analysis of Fault Diagnosis

Author: GuoJianWei
Tutor: ZhangPeiChao
School: Shanghai Jiaotong University
Course: Electrical Engineering
Keywords: Grounding grid Grounding resistance Measuring Fault Diagnosis
CLC: TM862
Type: Master's thesis
Year: 2008
Downloads: 61
Quote: 4
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Abstract


Grounding grid of the power system to maintain safe and reliable operation of the power system, important measures to protect the safety of operating personnel and electrical equipment. The grounding grid conductors buried in the ground, often due to poor welding construction and lack of weld, soil corrosion, ground fault current electric power role and other reasons lead to grid corrosion of the conductor and ground leads, even breaking, the ground network of electrical deterioration in the performance of the connection, grounding resistance increased. In order to guarantee and improve the reliability of grid equipment, security, the application of the grid grounding techniques are essential. Power system grounding grid is a very important indicator of the grounding resistance measurement of grounding resistance will be an important criterion discriminant grounding grid is good or bad. Obviously the measuring means and methods of the ground network is also very important. In this paper, the actual work, more systematic study of the ground network measurement technology. The thesis of the grounding grid method of measurement used, analyzed and summarized in a comparative analysis on each of the different methods, also described several commonly used concept grounded, described the basic principles of the grounding resistance measurement. Power system grounding resistance indicators reflect the overall level of the ground network, but a slip resistance increases or branch conductor corrosion cracking, grounding resistance will be difficult to be reflected. Existing judgment grid corrosion and breakpoint of the commonly used method is the way of the \Weld also lack effective means of inspection and acceptance. In the case of the normal operation of the power system, how to determine substation ground grid failure (including breakpoints and corrosion) position accurate, reliable and simple diagnostic theoretical analysis. Determined by the measured values ??of the electrical parameters in the lead of the grounding grid the breakpoint and corrosion of the ground network. This paper established a mathematical model that a network accurately reflect the segment conductor resistance value and Grounding leads the relationship between the electrical parameters. Segment conductor resistance value of the ground network and ground network ground lead between the mathematical relationship between the electrical parameters of a nonlinear relationship, it is necessary to adopt an iterative approach to solving the analog system simulation results show the effectiveness of the proposed method.

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