A Method of Using Finite Element Model to Design the Shell of Anti-condensation Ring Main Unit

Abstract

The invention provides a method for designing a housing of an anti-condensation ring main unit by using a finite element model. The method comprises the steps of: S1, performing three-dimensional modeling on overall ring main unit equipment, wherein the model parameters comprise distances of front and back, left and right of the ring main unit and the housing, height of a top space, shape of vents, position distribution of the vents and top inclination angle of the housing; S2, importing the model into a CFX toolkit of ANSYS software and performing grid division; S3, setting the boundary condition of the model; S4, obtaining various data of the housing the ring main unit by analog computation; S5, judging whether the various data satisfies a predetermined condition; S6, if not satisfying, adjusting corresponding values of one or more model parameters, and returning to step S2; and S7, if satisfying, outputting the obtained various data. By adopting the method, modeling analysis is performed on humidity, temperature, air speed and the like inside the ring main unit, so that the formed ring main unit can fulfill the purposes of reducing condensation, reducing the occurrence rate of electric accidents and the like without adopting the anti-condensation measures in the prior art.

Description

technical field [0001] The invention relates to the technical field of ring network cabinet protection, in particular to a method for designing an anti-condensation type ring network cabinet shell by using a finite element model. Background technique [0002] Ring network cabinets are widely used in urban power distribution systems due to their simple structure, small maintenance, low operating costs, reliable operation, and safety. The condensation problem in the ring network cabinet will cause the equipment in the ring main unit to rust, the operating mechanism will be jammed and corroded, and the line will be short-circuited and tripped, which will directly affect the safety of power supply. [0003] In order to reduce the occurrence of condensation in the ring main unit, the commonly used anti-condensation measures are mainly to improve the auxiliary design, including forced ventilation in the power distribution room, setting up a dehumidifier, setting up a heater, and u...

AI Technical Summary

Problems solved by technology

[0004] However, since the active equipment in the auxiliary design (such as exhaust fans, heaters and semiconductor refrigerators, etc.) is powered by the secondary power supply alone, not only the installation and transformation works are large, but also the input and maintenance of active equipment need to be completed manually. Removal, poor operability, resulting in the following two extreme situations: (1) The active equipment has been running after being put into operation, resulting in unnecessary waste of power consumption; (2) The active equipment was not started in time according to the climate change, resulting in condensation in the cabinet The situation cannot be improved

Even if the condensation sensor is used to automatically start the active equipment to heat the anti-condensation, there are the following two defects: (1) because the condensation sensor is a passive action device, it lacks a preventive process in the action time; (2) if the condensation Improper installation of the dew sensor does not guarantee that the condensation will first occur near the sensor, nor can it ensure that the active equipment is put into operation in time

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