CAJ | 학술논문

多柱芯体并联结构避雷器在特高压交流输电系统和串联电容补偿装置中得到了广泛应用,其暂态热特性的优劣直接影响运行可靠性,应通过合理设计确保其暂态热稳定性。对多柱芯体并联结构避雷器暂态热特性计算方法进行了研究,分析了暂态温升的计算方法,计算了避雷器散热过程的初始条件。根据避雷器散热过程的温度场方程,利用有限元法建立了多柱芯体并联结构避雷器散热特性三维计算模型。设计了避雷器比例单元,进行了暂态温升计算分析和试验,采用2ms方波电流试验方法在较短时间内给芯体注入较大的能量以模拟系统中避雷器芯体的暂态温升过程,测量了每次试验芯体产生的温升。设计了4柱芯体并联结构的避雷器试品,进行了避雷器散热特性计算和试验。试验中,采用工频电流法对避雷器试品进行加热,利用光纤光栅传感器测量避雷器散热过程中的电阻片温度变化。计算和试验对比结果表明,暂态温升的计算结果较实测温升高,计算结果与实测结果的误差均〈5%,暂态温升计算方法是有效的。散热特性的计算结果较试验结果偏严,误差〈5%,验证了采用多柱芯体并联结构避雷器散热特性计算方法计算避雷器的自然散热特性的有效性。
다주심체병련결구피뢰기재특고압교류수전계통화천련전용보상장치중득도료엄범응용,기잠태열특성적우렬직접영향운행가고성,응통과합리설계학보기잠태열은정성。대다주심체병련결구피뢰기잠태열특성계산방법진행료연구,분석료잠태온승적계산방법,계산료피뢰기산열과정적초시조건。근거피뢰기산열과정적온도장방정,이용유한원법건립료다주심체병련결구피뢰기산열특성삼유계산모형。설계료피뢰기비례단원,진행료잠태온승계산분석화시험,채용2ms방파전류시험방법재교단시간내급심체주입교대적능량이모의계통중피뢰기심체적잠태온승과정,측량료매차시험심체산생적온승。설계료4주심체병련결구적피뢰기시품,진행료피뢰기산열특성계산화시험。시험중,채용공빈전류법대피뢰기시품진행가열,이용광섬광책전감기측량피뢰기산열과정중적전조편온도변화。계산화시험대비결과표명,잠태온승적계산결과교실측온승고,계산결과여실측결과적오차균〈5%,잠태온승계산방법시유효적。산열특성적계산결과교시험결과편엄,오차〈5%,험증료채용다주심체병련결구피뢰기산열특성계산방법계산피뢰기적자연산열특성적유효성。
The multi-column parallel structure surge arrester has widely been applied in the UHV system and series capacitor compensation device.The operation reliability of surge arrester is directly determined by its transient thermal characteristics.The reasonable design is urgently needed to insure the excellent transient thermal reliability of surge arrester.Consequently,we investigated the calculation method for transient thermal characteristics of multi-column parallel structure surge arrester,analyzed the method of calculating transient temperature rise,and presented the initial conditions of surge arrester heat dissipation.Moreover,according to the temperature field equation in the course of surge arrester heat dissipation,we established the calculation model of multi-column structure surge arrester heat dissipation thermal characteristics by utilizing the three-dimensional finite element method.The transient temperature rise test and calculation were implemented in a designed proportion unit surge arrester.The 2ms square wave current test method was utilized to inject large energy into the core in a relatively short time in order to simulate the surge arrester transient temperature rise in actual system.The temperature rise was measured in each test.Furthermore,a four-column parallel structure surge arrester was constructed.The heat dissipation thermal characteristics test and calculation were carried out in the surge arrester.The power frequency current method was carried out for surge arrester sample heating in test.The fiber Bragg grating sensors were used to measure the surge arrester temperature changes during the heat dissipation process.The comparison results show that the calculation of transient temperature rise is higher than the measured temperature rise,the error of calculated and measured results is within 5%,and the transient temperature rise calculation method is effective.Compared with the test results,the calculation results of heat dissipation thermal characteristics are higher,and the errors are less than 5%.The validity of the surge arrester natural cooling characteristics calculation utilizing calculation method for transient thermal characteristics of multi-column parallel structure surge arrester was verified.