環(huán)氧絕緣材料在脈沖熱應力下的暫態(tài)溫度分布研究
發(fā)布時間：2019-03-13 09:50
【摘要】：飽和電抗器是HVDC換流閥的核心保護元件,換流閥周期性的導通與關斷使飽和電抗器絕緣長期承受周期性脈沖電熱應力的聯(lián)合作用,快速沖擊熱應力可能使環(huán)氧樹脂材料更易出現(xiàn)局部微觀結構破壞,導致絕緣性能下降。目前對飽和電抗器環(huán)氧樹脂材料周期性脈沖熱應力及其引起的絕緣老化機理尚不清楚,這成為影響高壓直流輸電可靠性的潛在威脅�；趯︼柡碗娍蛊鞴r及發(fā)熱原因進行深入調(diào)研和分析,得出銅損發(fā)熱由于水冷系統(tǒng)散熱可忽略不計,而鐵芯與環(huán)氧緊密貼合的結構使鐵損發(fā)熱成為了電抗器內(nèi)部絕緣的主要熱應力源,鐵芯發(fā)熱為周期性脈沖特性,極難計算及進行內(nèi)部測量。因此本文利用微秒脈沖電流和電熱合金形成阻性發(fā)熱,以相同波形電功率代替鐵損功率,提出一種微秒級脈沖熱源模擬方法,簡化了仿真計算的同時也能在實驗室條件下穩(wěn)定測量�；谝陨咸街�,本文將重點對飽和電抗器環(huán)氧樹脂材料的熱應力分布計算與快速瞬態(tài)溫度測量兩個問題進行了研究。1)采用基于JMAG-Designer的有限元分析軟件,建立脈沖功率發(fā)熱模型,可實現(xiàn)對材料內(nèi)部us量級瞬態(tài)溫度分布規(guī)律的仿真計算。2)對國內(nèi)外快速測溫方法和傳感器技術進行了系統(tǒng)研究,選定光纖分離式紅外測溫儀和光纖光柵分別作為瞬時和長時測溫傳感器,并進行對比實驗,建立了基于IGA740-LO光纖分離式紅外快速測溫平臺,溫度測量響應速度可達6us～9us;3)以沖擊電流發(fā)生器作為電源,Cr20Ni80鎳鉻電熱合金扁帶作為電阻模擬熱源,對距離熱源不同位置的環(huán)氧材料瞬態(tài)溫度變化進行了實驗研究,實驗結果表明環(huán)氧各點溫度變化曲線與仿真曲線趨勢相同、響應時間相同,溫度峰值誤差較小,實測和仿真保持了良好一致性。本文的研究為飽和電抗器環(huán)氧樹脂絕緣材料在周期性脈沖電熱應力聯(lián)合作用下的老化機理和壽命預測奠定了堅實的基礎。
[Abstract]:Saturation reactor is the core protection element of HVDC converter valve. The periodic conduction and turn-off of the valve make the insulation of saturated reactor endure the combined action of periodic pulse electrothermal stress for a long time. Rapid impact thermal stress may make epoxy resin materials more vulnerable to local microstructure damage, resulting in a decline in insulation properties. At present, the periodic pulse thermal stress of epoxy resin materials for saturated reactor and the mechanism of insulation aging are not clear, which has become a potential threat to the reliability of HVDC transmission. Based on the in-depth investigation and analysis of the working conditions and heating causes of the saturated reactor, it is concluded that the copper loss heating is negligible due to the heat dissipation of the water-cooled system. The structure of the iron core and epoxy makes the iron loss heating become the main heat stress source of the internal insulation of the reactor. The core heating is periodic pulse characteristic, so it is very difficult to calculate and carry out the internal measurement. Therefore, a micro-second pulse heat source simulation method is proposed in this paper, which uses the micro-second pulse current and electrothermal alloy to form resistive heating, and replaces the iron loss power with the same waveform electric power. It simplifies the simulation calculation and can also be measured stably under laboratory conditions. Based on the above findings, this paper focuses on the calculation of thermal stress distribution and rapid transient temperature measurement of epoxy resin materials for saturated reactor. 1) the finite element analysis software based on JMAG-Designer is adopted. A pulse power heating model can be established to simulate and calculate the transient temperature distribution of us order in the material. 2) the rapid temperature measurement method and sensor technology at home and abroad are systematically studied. The fiber separation infrared thermometer and fiber grating are selected as instantaneous and long-term temperature sensors, respectively. A fast infrared temperature measurement platform based on IGA740-LO fiber separation is established, and the response speed of temperature measurement is up to 6 us ~ 9 us. 3) using the impulse current generator as the power source and the Cr20Ni80 Ni-Cr alloy flat strip as the resistance simulation heat source, the transient temperature variation of epoxy materials at different locations from the heat source was experimentally studied. The experimental results show that the temperature variation curve of each point of epoxy is the same as the simulation curve, the response time is the same, the temperature peak error is small, and the measurement and simulation are in good agreement. The study in this paper lays a solid foundation for the aging mechanism and life prediction of saturated reactor epoxy resin insulation materials under the combined action of periodic pulse electrothermal stress.
【學位授予單位】：華北電力大學(北京)
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TM21
本文編號：2439288
[Abstract]:Saturation reactor is the core protection element of HVDC converter valve. The periodic conduction and turn-off of the valve make the insulation of saturated reactor endure the combined action of periodic pulse electrothermal stress for a long time. Rapid impact thermal stress may make epoxy resin materials more vulnerable to local microstructure damage, resulting in a decline in insulation properties. At present, the periodic pulse thermal stress of epoxy resin materials for saturated reactor and the mechanism of insulation aging are not clear, which has become a potential threat to the reliability of HVDC transmission. Based on the in-depth investigation and analysis of the working conditions and heating causes of the saturated reactor, it is concluded that the copper loss heating is negligible due to the heat dissipation of the water-cooled system. The structure of the iron core and epoxy makes the iron loss heating become the main heat stress source of the internal insulation of the reactor. The core heating is periodic pulse characteristic, so it is very difficult to calculate and carry out the internal measurement. Therefore, a micro-second pulse heat source simulation method is proposed in this paper, which uses the micro-second pulse current and electrothermal alloy to form resistive heating, and replaces the iron loss power with the same waveform electric power. It simplifies the simulation calculation and can also be measured stably under laboratory conditions. Based on the above findings, this paper focuses on the calculation of thermal stress distribution and rapid transient temperature measurement of epoxy resin materials for saturated reactor. 1) the finite element analysis software based on JMAG-Designer is adopted. A pulse power heating model can be established to simulate and calculate the transient temperature distribution of us order in the material. 2) the rapid temperature measurement method and sensor technology at home and abroad are systematically studied. The fiber separation infrared thermometer and fiber grating are selected as instantaneous and long-term temperature sensors, respectively. A fast infrared temperature measurement platform based on IGA740-LO fiber separation is established, and the response speed of temperature measurement is up to 6 us ~ 9 us. 3) using the impulse current generator as the power source and the Cr20Ni80 Ni-Cr alloy flat strip as the resistance simulation heat source, the transient temperature variation of epoxy materials at different locations from the heat source was experimentally studied. The experimental results show that the temperature variation curve of each point of epoxy is the same as the simulation curve, the response time is the same, the temperature peak error is small, and the measurement and simulation are in good agreement. The study in this paper lays a solid foundation for the aging mechanism and life prediction of saturated reactor epoxy resin insulation materials under the combined action of periodic pulse electrothermal stress.
【學位授予單位】：華北電力大學(北京)
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TM21
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