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Optimized configuration method of transformer magnetic bias treatment devices is proposed on the basis of multi-indexes comprehensive evaluation. First, based on analyzing of the mechanism of transformer magnetic bias and its influence factors, the paper constructs a satisfactory optimization model. Followed, it is calculated about satisfaction degree and urgency degree of each substation influenced...
This paper describes hands-on modeling and simulation experience for designing substation ground grids. The grounding studies enable an optimized ground grid design to protect utility personnel and the public. These optimized ground grids meet the IEEE-80 standard <xref ref-type="bibr" rid="ref1">[1]</xref> for safety and have been simulated and designed using more...
External grounding grid is an effective measure to reduce grounding resistance of grounding grid. In order to meet the requirements of the grounding resistance in the most economical way, it is important to determine the distance and the area of the external grounding grid. Generally speaking, when the area is larger, the grounding resistance is smaller. When the distance of the external grounding...
This paper describes hands-on solid modeling experience of the safe optimal ground grid design (less copper) for a large Extra High Voltage (EHV) substation. The optimized ground grid meets the IEEE-80 standards for safety without compromising on step or touch potential thresholds. The ground grid has been designed in CDEGS using fault current flow concepts, and multiple injection points simulate...
The occurrence of DC Bias will affect the normal operation of power transformer, thus DC bias withstand capability of transformer is a prerequisite for stable operation of power system. In this paper, the DC current distribution model of transformer neutral point in Yichang area is established. Meanwhile, according to the transformer noise limit, the maximum current which is allowable to flow through...
Unequally spaced method of grounding grid can economize metal material on the premise of ensuring the safety of equipment and personnel. A new optimization formula of grounding grid buried in uniform soil is presented in this paper. An analysis of grid conductor spacing of unequally spaced grounding grid was done. Serial number was given to each conductor as a specific numbering. A conversion formula...
The ground resistance, the ground potential rise, touches and step voltages are the basic design quantities of the grounding grids. Such quantities greatly depend on the safety of grounding system. The aim being pursued is to minimize these mentioned quantities, while the safety restrictions required by the standard regulations are met. The innovative aspect of the proposed approach is the influences...
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