本文選題：瓦斯繼電器 + CFD數(shù)值模擬　； 參考：《昆明理工大學(xué)》2017年碩士論文

【摘要】：瓦斯繼電器是由馬克斯·布赫霍爾茨于1921年研制發(fā)明的。自從問世以來,它便成為液冷變壓器和接地電抗器重要的保護(hù)和監(jiān)控設(shè)備。其不但具有結(jié)構(gòu)簡單、動作快、靈敏度高等特點(diǎn),且運(yùn)行穩(wěn)定、可靠性高、安裝簡單一直被用作變壓器內(nèi)部的主保護(hù)裝置。但近年來由于瓦斯繼電器誤動作引起的電力事故頻發(fā),給電力系統(tǒng)安全運(yùn)行以及供電可靠性造成了巨大的影響,因此開展對瓦斯繼電器的流場理論研究,對電力系統(tǒng)的安全穩(wěn)定運(yùn)行來說具有重大意義。目前進(jìn)口 BF型雙浮球型瓦斯繼電器和國產(chǎn)QJ-80型瓦斯繼電器在電力企業(yè)中應(yīng)用較為廣泛,本文就以這兩種型號的瓦斯繼電器作為研究模型。在查閱了大量的相關(guān)文獻(xiàn)和科研動態(tài)分析的基礎(chǔ)上,獨(dú)立開展瓦斯繼電器的流場理論研究。首先運(yùn)用三維CAD建模軟件Pro/ENGINEER對兩種型號的瓦斯繼電器進(jìn)行三維實體建。為了模擬結(jié)果更加精確,在建模時對瓦斯繼電器內(nèi)部構(gòu)造進(jìn)行了詳盡的刻畫,使計算模型的參數(shù)盡可能的還原實測參數(shù)。并采用ICEM軟件來完成計算流體域的網(wǎng)格劃分,實現(xiàn)CAD與CFD技術(shù)的融合。本次瓦斯繼電器的計算流體域采用結(jié)合結(jié)構(gòu)化和非結(jié)構(gòu)化網(wǎng)格優(yōu)勢的混合網(wǎng)格劃分技術(shù)。之后基于動網(wǎng)格理論對兩種型號的瓦斯繼電器工作的全過程進(jìn)行了動態(tài)CFD數(shù)值模擬,并對各自計算結(jié)果進(jìn)行分析研究。研究結(jié)果表明:兩種型號的瓦斯繼電器的差異主要體現(xiàn)在對水流沖擊力矩的敏感程度上,國產(chǎn)QJ-80瓦斯繼電器的反應(yīng)相對保守,進(jìn)口 BF型瓦斯繼電器的反應(yīng)更靈敏。同時針對可能導(dǎo)致重瓦斯誤動作原因①反向油流沖擊;②抗振性能不足;展開了深入地分析。分析結(jié)果表明兩種可能誤動作原因①反向油流沖擊導(dǎo)致重瓦斯誤動作的可能性很小;②對抗振性能不足提出了相應(yīng)的改良方案,并檢驗了改良方案的有效性。最后提出將CFD計算機(jī)仿真技術(shù)運(yùn)用到瓦斯繼電器油流整定值的校驗方面。模擬試驗結(jié)果表明:該方法能簡潔有效地對瓦斯繼電器油流整定值進(jìn)行校驗,并能清晰的反應(yīng)瓦斯繼電器內(nèi)部指定時刻的流速分布狀況。有效的提高了瓦斯繼電器油流整定值校驗的效率和可靠性。
[Abstract]:The gas relay was invented by Max Buchholtz in 1921. Since its inception, it has become an important protection and monitoring equipment for liquid-cooled transformers and earthing reactors. It not only has the characteristics of simple structure, fast action and high sensitivity, but also has the advantages of stable operation and high reliability. The simple installation has been used as the main protection device inside the transformer all the time. But in recent years, due to the frequent power accidents caused by gas relay misoperation, it has a great impact on the safe operation of power system and the reliability of power supply. Therefore, the flow field theory of gas relay has been studied. It is of great significance to the safe and stable operation of power system. At present, the imported BF double floating ball gas relay and the domestic QJ-80 gas relay are widely used in the electric power enterprise. This paper takes these two types of gas relay as the research model. On the basis of consulting a lot of related literature and dynamic analysis of scientific research, the flow field theory of gas relay is studied independently. Firstly, three-dimensional CAD modeling software Pro/ENGINEER is used to build three-dimensional entity for two types of gas relays. In order to get more accurate simulation results, the internal structure of gas relay is described in detail when modeling, so that the parameters of the calculation model can be restored to the measured parameters as much as possible. The ICEM software is used to mesh the computational fluid domain and the integration of CAD and CFD technology is realized. The gas relay in the computational fluid domain adopts the hybrid mesh generation technology combining the advantages of structured and unstructured grids. Then, based on the dynamic grid theory, the dynamic CFD numerical simulation of the whole process of the two types of gas relay is carried out, and the respective calculation results are analyzed and studied. The results show that the difference between the two types of gas relays is mainly reflected in the sensitivity to the impact moment of water flow. The response of domestic QJ-80 gas relays is relatively conservative, and that of imported BF type gas relays is more sensitive. At the same time, in view of the possible cause of heavy gas misoperation, the anti-vibration ability of reverse oil flow impingement is insufficient, and the deep analysis is carried out. The results show that the two possible causes of misoperation are as follows: (1) the possibility of heavy gas misoperation caused by reverse oil flow impact is very small and the corresponding improvement scheme is put forward for the deficiency of anti-vibration ability, and the effectiveness of the improved scheme is tested. Finally, the application of CFD computer simulation technology to the calibration of oil flow setting of gas relay is put forward. The simulation results show that the method is simple and effective to calibrate the oil flow setting of gas relay and can clearly reflect the flow velocity distribution of the gas relay at the specified time. The efficiency and reliability of oil flow setting check of gas relay are improved effectively.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM58

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本文編號：1781930