Oil-submerged pump damage degree evaluation method and system based on particle analysis

Abstract

The invention relates to an oil-submerged pump damage degree evaluation system and method based on particle analysis. The method comprises the steps: measuring the temperature, pressure and flow of transformer oil through a measuring system; detecting the components and granularity of solid particles in oil at an inlet and an outlet of an oil-submerged pump by using an oil granularity detector; determining boundary conditions according to the temperature, the pressure, the flow, and the components, the density and particle size distribution of the oil at the inlet and the outlet of the oil-submerged pump; selecting a proper erosion model for numerical simulation of a main eroded area and the overall erosion rate of the oil-submerged pump; calculating the accumulation of the volume of the oil-submerged pump generated by particle erosion along with time; detecting the particle concentration and particle size distribution of the inlet and the outlet of the oil-submerged pump after a specific period of time, and comparing with a simulation result of the erosion model; and predicting the damaged part and damage degree of the oil-submerged pump through the simulation model after comparison and calibration, and giving a warning when the oil-submerged pump reaches a threshold value.

Description

technical field [0001] The invention relates to a particle erosion-based damage assessment method, in particular to a particle analysis-based damage assessment method and system for a submersible oil pump. Background technique [0002] With the development of science and technology and the improvement of people's living standards, people's demand for electricity is increasing, and the transmission and rational distribution of electricity is particularly important. A substation is a place in a power system that transforms voltage and current, receives electric energy and distributes electric energy. With the advancement of technology in our country, the voltage level of transformers in substations is also getting higher and higher. At present, due to the increase in voltage level of transformers in substations, the internal insulation of valve side windings, outgoing line structures and bushings is one of the main problems that need to be solved. In addition to the insulati...

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Problems solved by technology

[0004] However, the focus of the existing technology is on the matching degree between the flow rate of the submersible pump and the heat dissipation of the transformer. For the long-term high-load operation of the submersible pump, the blades and oil passages caused by their own defects are prone to surface erosion due to the erosion of solid particles. , The exfoliated particles may flow into the transformer, causing wear of other key components, and even the metal particles in it reach a certain limit, which may also cause a short circuit of the transformer, threatening the safe operation of the transformer, etc. Issues such as threats to the safe operation of the transformer are not fully considered, and the submersible pump is regularly disassembled for damage detection obviously unrealistic

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