Distributed substation grounding grid detecting and evaluating method

A substation grounding grid, distributed technology, applied in the direction of fault location, etc., can solve the problems of correct evaluation of unfavorable grounding grid, heavy workload, etc., and achieve the effect of solving the requirements of real-time detection and status evaluation

Active Publication Date: 2018-01-09
STATE GRID LIAONING ELECTRIC POWER RES INST +2
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Problems solved by technology

The main method for evaluating the state of the grounding grid is to measure and analyze the grounding impedance, step voltage, contact voltage, and potential distribution in the substation. The inspection of the material of the grounding grid is mainly achieved by means of excavation. In addition to the heavy workload, there are also Weather, instruments and many other factors that affect the measurement results are not conducive to the correct evaluation of the overall status of the grounding grid

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  • Distributed substation grounding grid detecting and evaluating method
  • Distributed substation grounding grid detecting and evaluating method
  • Distributed substation grounding grid detecting and evaluating method

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Embodiment 1

[0063] The invention is a distributed substation grounding grid detection and evaluation method, comprising the following steps:

[0064] Step 1: According to the design documents of the substation grounding grid, reverse the soil model in the substation and the power frequency grounding impedance value of the substation grounding grid;

[0065] The grounding grid soil model inversion in the step 1 is obtained according to the soil resistivity measurement data in the design file:

[0066] ρ=2πaU / I (1);

[0067] In formula (1): ρ is the soil resistivity; a is the distance between the two electrodes during the test; U is the potential difference between the two potential electrodes during the test; I is the test current. Calculate the relationship curve between the soil resistivity ρ and the electrode spacing a, and obtain the soil model of the site. The calculation of the characteristic parameters of the ground grid when a ground fault occurs in the substation is carried out ...

Embodiment 2

[0082] In step 5 of the present invention, the ART-2 type neural network is mainly divided into a network initialization stage and a comparison stage, and the method for realizing it can also be:

[0083] Step 5.1: According to the data calculated in Step 1-Step 3, establish the ART-2 type neural network, and initialize the connection weights to the characteristic parameters when the grounding grid is intact, and the characteristic parameters when the grounding grid nodes are severely corroded and broken, including Ground impedance, ground potential rise, step voltage, touch voltage, etc., and set the confidence threshold. The output of each fault point network has two states, the state is intact, and the grounding conductor is broken. If there are n fault points, the output neurons of the network are 2n; and the similarity threshold is set.

[0084] Step 5.2: According to the measurement data of the state monitoring device, simulate and calculate the characteristic parameters...

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Abstract

The invention, which belongs to the technical field of the grounding grid of the transformer substation, especially relates to a distributed substation grounding grid detecting and evaluating method.The method comprises the following steps that: according to a substation grounding grid design file, inversion of a soil model in the substation and a power-frequency ground impedance value of a substation grounding grid is carried out; a ground potential rising value, a step voltage and contact voltage characteristic parameters in the substation are calculated on the condition of occurrence of aground fault; when a ground conductor is broken, ground potential rising values, step voltages and contact voltage characteristic parameters in the substation are calculated by using simulation software on the conditions of fault occurrence at different places; the operating state of the ground conductor in the grounding grid is detected by combining a distributed grounding grid state evaluation device and characteristic parameters of the grounding grid are calculated at different fault sites when the ground conductor is in a current state; and the current state of the conductor is compared and identified to obtain an overall evaluation result of a ground device in the current substation. According to the invention, the operation state of the ground conductor in the grounding grid can be tracked and thus measures are taken timely, thereby eliminating an accident affecting the safety of the equipment and the staff.

Description

technical field [0001] The invention belongs to the technical field of substation grounding grids, and in particular relates to a distributed substation grounding grid detection and evaluation method, in particular to a distributed substation grounding grid state detection and evaluation method. Background technique [0002] The grounding grid is one of the important equipment in the substation. When a grounding short-circuit fault occurs in the substation, the short-circuit current will disperse into the ground through the grounding grid, and play the role of voltage equalization to protect the safety of personnel and equipment in the substation. With the increase of the operation time, the performance deterioration of the grounding grid due to corrosion, aging and other reasons is inevitable, and accidents caused by this occur from time to time. The grounding grid of the substation is a kind of semi-maintenance-free equipment. It is buried underground in the new stage of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 金鑫崔巨勇李冠华吴传玺赵庆源王玲毛小虎金焱黄福存韦德福杨鹤王帅王冠宇
Owner STATE GRID LIAONING ELECTRIC POWER RES INST
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