【摘要】：斷路器作為電力系統(tǒng)中最重要的開關(guān)電器之一,能關(guān)合、承載、開斷運(yùn)行回路正常電流,也能在規(guī)定時(shí)間內(nèi)關(guān)合、承載及開斷規(guī)定的過載電流(包括短路電流)。觸頭彈跳是斷路器合分閘操作中不可避免的現(xiàn)象。合分閘彈跳會(huì)減少斷路器壽命,影響斷路器工作性能,降低斷路器工作可靠性。對(duì)斷路器在短路條件下的合分閘彈跳進(jìn)行研究可以更加準(zhǔn)確的掌握斷路器的實(shí)際工作情況,對(duì)提高斷路器的工作性能與可靠性具有十分重要的意義。本文利用Ansoft軟件對(duì)ZDS4型斷路器合閘電磁鐵在額定電壓的受力進(jìn)行靜態(tài)分析,對(duì)短路條件下動(dòng)觸頭所受洛倫茲力及霍爾姆力進(jìn)行靜態(tài)分析,得到了力—位移—電流的三維曲線;然后在ADAMS中建立了ZDS4型斷路器虛擬樣機(jī),聯(lián)合Ansoft計(jì)算結(jié)果仿真得到空載下合分閘彈跳情況,并通過高速攝像儀試驗(yàn)驗(yàn)證了仿真計(jì)算的正確性;對(duì)多種影響合分閘的因素進(jìn)行了仿真研究,得到了在改變這些參數(shù)時(shí)的彈跳變化情況。最后結(jié)合利用PSCAD模擬出的短路分?jǐn)嚯娏鞑ㄐ?以及仿真得到的洛倫茲力和霍爾姆力,對(duì)短路條件下的合分閘彈跳進(jìn)行了研究,通過與空載下的合分閘彈跳對(duì)比得出結(jié)論:在電流峰值30k A,時(shí)間常數(shù)15ms的短路條件下的合閘彈跳與空載下的合閘彈跳區(qū)別很小,但是在分閘彈跳特性上有較大差異,相較于空載,短路條件下的分閘彈跳第一個(gè)脈寬較短,第二個(gè)彈跳脈寬較長(zhǎng),且短路條件下的分閘彈跳高度都要更高,因此會(huì)帶來更大的電弧重燃風(fēng)險(xiǎn);最后通過短路合分試驗(yàn)驗(yàn)證了仿真研究的正確性。
[Abstract]:As one of the most important switchgear in power system, circuit breaker can close, carry and break the normal current of operation circuit, and also can close, carry and break the prescribed overload current (including short circuit current) within the specified time. Contact bouncing is an inevitable phenomenon in closing and opening operation of circuit breaker. Closing and tripping can reduce the life of circuit breaker, affect the working performance of circuit breaker and reduce the reliability of circuit breaker. The study on the tripping of circuit breakers under the condition of short circuit can more accurately grasp the actual working conditions of the circuit breakers, and it is of great significance to improve the performance and reliability of the circuit breakers. In this paper, the static analysis of the force on rated voltage of the closing electromagnet of ZDS4 circuit breaker is carried out by using Ansoft software, and the Lorentz force and Holm force on the dynamic contact under the condition of short circuit are analyzed statically, and the three dimensional curves of force, displacement and current are obtained. Then the virtual prototype of ZDS4 circuit breaker is established in Adams, and the simulation results of Ansoft are used to get the bouncing situation of no-load closing and opening, and the correctness of the simulation calculation is verified by high-speed camera test. A variety of factors affecting the closing and opening of the gate are simulated and the bouncing changes are obtained when these parameters are changed. Finally, combined with the short circuit breaking current waveform simulated by PSCAD, and the Lorentz force and Holm force obtained by simulation, the sluice closing bouncing under short circuit condition is studied. By comparing with the closing jump under no load, it is concluded that there is little difference between the closing bounce under the condition of the current peak value of 30kA and the short-circuit condition of the time constant 15ms, but there is a great difference in the characteristics of the sluice opening bouncing. Compared with no-load, the first pulse width is shorter and the second spring pulse width is longer under short circuit condition, and the height of opening jump is higher under short circuit condition, so it will bring more risk of arc reburning. Finally, the correctness of the simulation is verified by short-circuit test.
【學(xué)位授予單位】：中國(guó)艦船研究院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM561

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本文編號(hào)：2132561