A voltage equalization method for the main grounding grid of a substation

A substation grounding grid and grounding grid technology, which is applied in the direction of measuring electricity, measuring electrical variables, measuring resistance/reactance/impedance, etc., can solve the problems of rarely setting up living areas and uneven distribution of ground potential, and achieves reduction of contact voltage and improvement of Safe, less unevenly distributed effects

CN106468748BActive Publication Date: 2019-01-18RES INST OF ECONOMICS & TECH STATE GRID SHANDONG ELECTRIC POWER +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-01-18

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Abstract

The invention discloses a voltage-sharing method for a main grounding network of a transformer station, and the method is used for solving a problem of grounding safety. The method is characterized in that the method comprises the following steps: (1), measuring the soil resistivity of the transformer station, and carrying out the structural design of a grounding network; (2), calculating the distribution condition of ground potential rise, and adding a grounding electrode at a corner of the grounding network with the most uneven distribution of ground potential rise; (3), determining the parameter of the grounding electrode, enabling the grounding electrode to be connected to the grounding network, and then carrying out the new calculation till a contact voltage and a step voltage reach set values. According to the invention, the corner of the grounding network is provided with the grounding electrode, and the grounding electrode can effectively reduce the distribution unevenness of the ground potential, thereby effectively reducing the contact voltage and the step voltage, and improving the safety of the grounding network.
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Description

technical field

[0001] The invention relates to the technical field of a voltage equalization method for a grounding grid, in particular to a voltage equalization method for a main grounding grid of a substation. Background technique

[0002] A good grounding system is a necessary condition to ensure the safe operation of substations. According to relevant domestic grounding standards, the power frequency grounding resistance of the substation grounding grid should meet Among them, I is the grounding current flowing into the grounding grid. When the grounding resistance of the main grounding network satisfies this formula, the ground potential rise of the substation will not exceed 2kV, which can generally guarantee the safety of equipment and personal.

[0003] With the development of economy and society, the scale of power system is expanding day by day, and the ground fault current of voltage busbars at all levels in substations is increasing year by year. When a sing...

Examples

Embodiment Construction

[0038] Such as figure 1 As shown, it is the grounding grid of a typical substation, the size of the grounding grid is 60m×50m, and the buried depth is 0.8m. Since the substation uses multiple horizontal grounding bodies to form a grid-like pressure equalization zone, although the ground potential distribution in the middle of the grounding grid fluctuates, the fluctuation is not large; In the junction zone, the ground current will flow into the ground through the ground grid, causing drastic ground potential changes here, such as Figure 8 , Figure 9 As shown, the contact voltage and step voltage are greatly increased, which affects the safety of the grounding grid.

[0039] Since all the ground current needs to flow out through the edge of the ground grid, the potential distribution at the corners of the ground grid is extremely uneven. How to reasonably increase the contact area between the corners of the ground grid and the soil to increase the flow of the ground current...