Soil breakdown field strength test device for safety assessment of buried pipeline below power grid

Abstract

The invention discloses a soil breakdown field strength testing device for safety assessment of a buried pipeline below a power grid, and the soil breakdown field strength testing device is used for testing to determine the breakdown field strength of soil where the pipeline is located. The soil breakdown field strength test device comprises a soil container, test soil filled in the soil container, a buried pipeline model buried in the test soil, a needle electrode inserted into the test soil, and a lightning impulse voltage generator connected with the needle electrode, a negative impulse voltage waveform with the wave head / wave tail time of 1.2 / 50us is generated through a lightning impulse voltage generator and is applied to test soil through a needle electrode, the needle electrode is connected with a voltage divider, and the voltage divider is connected with an oscilloscope. According to the invention, the soil breakdown field strength test device is adopted to carry out impact tests on soil with different electrical resistivity, and the average soil breakdown field strength is obtained, so that whether a soil discharge channel can reach a pipeline or not is judged by further combining with the ground potential rise of a grounding body.

Description

[0001] The application of the present invention is based on the Chinese patent number 2021111412522 submitted by the applicant on September 28, 2021, and the patent name is a divisional application proposed by the pipeline safety assessment method for power grid under the condition of lightning strike or ground short circuit fault. technical field [0002] The invention relates to electric power engineering technology, in particular to the technology for evaluating the impact of transmission network on pipeline safety. Background technique [0003] Under the condition of lightning strike or ground short-circuit fault, the threat to the pipeline is divided into two ways: [0004] (1) The large value of the current into the ground causes the soil around the grounding body of the tower to be broken down, and the discharge channel of the arc reaches the surface of the pipeline, directly posing a threat to the pipeline. [0005] (2) Under the conditions of lightning strike and gr...

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Problems solved by technology

[0004] (1) The large value of the ground current causes the soil around the grounding body of the tower to be broken down, and the discharge channel of the arc reaches the surface of the pipeline, directly posing a threat to the pipeline

[0005] (2) Under the conditions of lightning strike and ground fault, there is a large potential difference between the soil outside the pipeline anti-corrosion layer and the metal on the inner wall of the pipeline. If the voltage of the anti-corrosion layer is too high, the anti-corrosion layer may be broken down

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