發(fā)布時間：2018-11-14 16:29

【摘要】：本文首先綜述國內外有關濾油的技術研究和發(fā)展現(xiàn)狀,闡述了在線濾油的重要意義與實用價值,并進一步提出了變壓器在線濾油裝置的設計思想和技術方案。本文深入研究了變壓器油的性質、變壓器油污染的原因、成分及特征提取。詳細的介紹了真空法、沉淀法、離心法等去除污染成分的方法,并對各種技術的優(yōu)缺點進行比較說明。同時還對氣體特征的提取—氣相色譜法,水分特征的提取—紅外光譜法,流量的采集—節(jié)流式流量計法,溫度的采集—熱電阻法等特征量的提取和數(shù)據(jù)采集進行說明,并且對溫度的控制—熱交換法和流量的控制—變頻法,進行了深入的研究。變壓器帶電濾油時,由于油流帶電,流速過大時可能導致絕緣材料損壞,從而危及變壓器的安全運行,因此需要對變壓器油的流速進行監(jiān)測并實現(xiàn)流速控制,通過調頻器和PID配合改變電動機的電壓和頻率,進而實現(xiàn)變壓器油流速的控制,可以實現(xiàn)流速平滑調節(jié),且調節(jié)范圍大,響應速度快。變壓器油溫度過高時,導致變壓器油壽命縮短,且過濾后的絕緣油流回變壓器時,溫度過高會引起系統(tǒng)警報。變壓器油溫度過低時,導致變壓器油過濾效果不理想。因此需要對變壓器油進行加熱,將溫度控制在一定的范圍內,并對過濾后絕緣油進行散熱處理,因此需要對溫度進行采集與控制,本裝置利用PT100來實現(xiàn)溫度采集,采用換熱器調節(jié)變壓器油溫度,通過控制換熱器的板型和換熱介質的流速實現(xiàn)溫度的控制,本文通過對比各種換熱器的進行換熱器選擇與設計。最后本文闡述了基于流量和溫度自動控制的變壓器在線濾油機的整體結構與性能,并以現(xiàn)場應用實例驗證。測試數(shù)據(jù)表明,變壓器油在線凈化效果良好,完全符合相關規(guī)程要求。在濾油期間保護裝置均未動作,說明在線濾油的安全可靠,具有實際應用價值。
[Abstract]:In this paper, the research and development of oil filter technology at home and abroad are reviewed, the significance and practical value of on-line oil filter are expounded, and the design idea and technical scheme of on-line oil filter device for transformer are put forward. In this paper, the properties of transformer oil, the causes of transformer oil pollution, components and feature extraction are studied. The methods of removing pollutants such as vacuum method, precipitation method and centrifugal method are introduced in detail, and the advantages and disadvantages of each technology are compared. At the same time, the extraction and data acquisition of gas feature extraction-gas chromatography, water feature extraction-infrared spectrum method, flow rate acquisition-throttle Flowmeter method, temperature acquisition-thermal resistance method, etc. The temperature control-heat exchange method and flow-control-frequency conversion method are studied. When transformer is charged with filter oil, because the oil flow is electrified and the flow rate is too large, it may lead to the damage of insulation material, thus endangering the safe operation of transformer. Therefore, it is necessary to monitor and control the flow rate of transformer oil. By changing the voltage and frequency of the motor through the cooperation of frequency modulator and PID, the flow rate of transformer oil can be controlled, and the flow rate can be adjusted smoothly, and the range of regulation is wide and the response speed is fast. When the temperature of transformer oil is too high, the life of transformer oil will be shortened, and the system alarm will be caused when the filtered insulating oil flows back to transformer. When the temperature of transformer oil is too low, the filter effect of transformer oil is not ideal. Therefore, the transformer oil needs to be heated, the temperature is controlled within a certain range, and the filtered insulating oil is treated with heat dissipation, so it is necessary to collect and control the temperature. The device uses PT100 to realize the temperature acquisition. The temperature of transformer oil is regulated by heat exchanger, and the temperature is controlled by controlling the shape of heat exchanger and the velocity of heat transfer medium. In this paper, the heat exchanger is selected and designed by comparing various kinds of heat exchangers. At last, the whole structure and performance of transformer oil filter based on automatic control of flow rate and temperature are described. The test data show that the on-line purification effect of transformer oil is good and conforms to the requirements of relevant regulations. The protection device is not operated during oil filter, which shows that the oil filter on line is safe and reliable and has practical application value.
【學位授予單位】：沈陽工程學院
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TM406

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本文編號：2331702