220kV Ganlu-Substation Grounding Network Transformation Technology Research

In order to ensure power system stability, safe operation, you need a good grounding qualified network. Important parameters include grounding resistance of grounding grid, step and touch voltages, are important factors affecting the substation grounding grid security, grounding resistance in the analysis, the calculation of step and touch voltages and influence the process, focusing on the application of substation ground grid of vertical grounding resistance reduction method of in-depth research to get the best increase vertical grounding resistance reduction methods. This paper combines the research progress at home and abroad, and on the impact of the substation grounding grid network data safety grounding, grounding resistance, contact voltage, step voltage computing and influencing factors are analyzed, specifically divided into the following sections.1 Ground parameters a substation ground network has reached a grounding code req uirements, technical and economic indicators of whether science, depending on whether t he correct approach to network design. Only implementation of the design, to be able to get the ground parameters meet code requirements, and reasonable technical and econom ic indicators of the ground network based on the correct methods and procedures. In the d esign of substation grounding process, the need to seriously implement the national polic y guidelines, a detailed summary of the experience, in a manner specific types of electric al equipment and operating systems, such as grounding the nature and characteristics oft he geological structure, contact the actual situation, and strive to achieve a reasonable ad vanced technology, economic savings.2 Application grounding parameters numerical procedure for the creation of vertical grounding grounding resistance at the level of the ground after a three-dimensional onlin e calculation of grounding grid. Advantage of numerical calculation method is:You can t hink about the actual structure of a more comprehensive and specific conditions of the gr ound fault current diaspora networks, but also enables the implementation of ground grid design under economic evaluation of technical feasibility in the background.3 substation grounding system should meet two requirements, one is the grounding resistance should be reduced to a certain value, in order to meet the requirements to ensure that the contact voltage, on the other hand is possible to promote uniform distribution of surface voltage, to step voltage requirements. Optimal placement of grounding grid is a kind of equalizing technology to promote uniform distribution of surface potential. Many ordinary substation ground grid current is applied equally spaced arrangement, which is the middle ground conductors have equal spacing, spacing, etc. without grounding grid lay out is the basic principle of the shielding effect of the middle part of the consideration of the grounding grid conductors, lay out grounding conductor should dilute the middle, near the grounding grid lay out should be more dense, can be fully applied all the grounding conductor.4 220kV substation ground grid nectar additional vertical grounding scheme, on the basis of the existing substation area does not change based on the use of additional vertic al grounding method for grounding resistance be reduced. The vertical ground a number of very uniform buried in the original construction of the ground-line, galvanized steel ve rtical grounding using the equivalent radius of 0.11m. Mannan 220kV substation groundi ng resistance measurement.