Trenchless detection method suitable for oil field tank field grounding grid

Abstract

The invention discloses a trenchless detection method suitable for an oil field tank field grounding grid, and belongs to the technical field of power system safety diagnosis. According to the technical scheme, the trenchless detection method suitable for an oil field tank field grounding grid comprises the following steps of: drawing a topological structure chart according to the construction drawing of a tank field grounding grid; carrying out node numbering and branch numbering on the tank field grounding grid to generate an association node matrix; measuring the resistance, contact resistance and port resistance of an auxiliary wire in sequence; and carrying out calculation through a corrosion fault detection program according to the measured resistance, contact resistance and port resistance of the auxiliary wire to obtain a corrosion detection result. The method has the beneficial effects that blind excavation can be avoided, the numbering method of the nodes and the branches issimple, the diagnosis precision can be improved, the detection time consumption is reduced, the length of a measurement wire is shortened, the error influence of contact resistance on branch resistance inverse operation is reduced, and the diagnosis precision is greatly improved.

Description

technical field [0001] The invention relates to the technical field of power system safety diagnosis, in particular to a no-excavation detection method suitable for grounding grids in oil field tank farms. Background technique [0002] The grounding grid of the tank farm is the main channel for the discharge of lightning current, and it is the basic measure to ensure the safety of lightning protection in the tank farm. If the grounding grid is severely corroded and fractured, the grounding resistance increases and the distribution of the ground potential is uneven, it will significantly reduce the speed of lightning current or lightning electrostatic induction charge discharge into the ground, and spark discharge or high-potential counterattack will occur between the metal accessories of the storage tank. The oil and gas are ignited and detonated, causing major safety accidents and losses. At present, the methods for detecting grounding grid corrosion faults are mainly divi...

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Problems solved by technology

[0004] 1) The nodes and branches cannot be numbered, and parameters such as the associated node matrix cannot be obtained, so that the inverse operation of the branch resistance cannot be performed

[0005] 2) You cannot directly get the final result with one input

For each measurement port, the two ends of the port with the largest resistance increase multiple of the previous diagnosis result are selected for measurement, so the steps of measurement→calculation need to be repeated, which is very time-consuming

[0006] 3) The measurement ports are usually far apart, so the length of the measurement wire is very high, and the field wiring is lengthy and time-consuming

[0007] 4) Since the contact resistance is usually tens of milliohms, and the grounding grid of the tank area is usually not large, and the port resistance is also tens of milliohms, the error caused by it is very influential, resulting in the result of the inverse calculation of the branch resistance being much larger than the actual value

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