Kc of each higher mode in ridge waveguide is a very important parameter , once kc is obtained , the wavelength , phase constant , phase velocity , waveguide wavelength , equivalent reactance , equivalent admittance and so on can be obtained simply . then ridge waveguide devices can be designed based on these paremeters . in view of the widely use of ridge waveguides , the research of kc is very important in practice 由于脊波导中主模及各高次模的kc是一个很重要的参数,求出了kc ,可以很简单地求出、相移常数,相速、波导波长、等效电抗、等效导纳等等,求出这些参数后就可以用各种方法设计脊波导元器件了。
The way of taking one nth out of capacitor ' s the first harmonic capacitive reactance as its nth harmonic impedance is verified whit the data from tang7c . according to the approximately estimating method , the first harmonic impedance of 220kv system is calculated . on the basis of the models , this paper gives the harmonic equivalent circuit of substation and gives the b ( n ) function of the harmonic time n . when the capacitors has different combination , b ( n ) ' s value will also change , with the inputting local measurement data , the paper studies the series and parallel resonance at the substation , and deduces that the reason the capacitor ' s fuse of tang6c is frequently interrupted is that its capacitor current contains a large number of 5th harmonics , and that the reason the discharging pt of tang7c capacitor being exploded is also that the 7th and 9th harmonic currents are amplified 据此,对该站进行了串联谐振分析和并联谐振分析,并结合测试数据和有关变电站的运行记录,指出了导致该站电容器汤6c频繁烧保险的主要原因是5次谐波电流含量偏高,引起汤7c放电pt爆炸也是因为7次和9次谐波电流被放大。针对这些导致汤阴变电站补偿电容器故障的原因,提出了相应的谐波治理措施,包括针对汤6c电容器5次谐波电流含量偏高的原因,提出了停运汤6c电容器或者通过把汤sc电容器的部分容量并入汤6c电容器(汤sc其余部分停运)以增加汤6c谐波承受能力的措施;针对# 2变低压侧7次和9次谐波电流被放大的现象,提出了在汤7c电容器上加装一定百分比的串联电抗器的措施。
3 . adopted the design thought of virtual instrument , the automatic reactance testing system and the instrument of power angle measurement are developed , which change the traditional measure means based on manual operation , a new method is provided for measure the parameter of reactance . 4 采用虚拟仪器的设计思想,开发出了稀土永磁同步电机电抗参数自动测试系统和功角测量装置,改变了以往以手工测试为主的测试手段,为电抗参数的测试提供全新的手段和方法。
Powerformer have some changes in constract with the conventional generator , subsequently it also have some new problems in order to have an economical , efficient , credible development and application the structure and the philosophy of electromagnetism of powerformer will be on speaking terms changes electrical design , magnetism design , thermal design and structural design are have some new changes above all , the electromagnetism parameter and the harmonic magnetomotive force of powerformer are studied in this paper first , it mainly utilizes analytics to deduce formula of slot leakage reactance it considers three instances , including monolayer - slot , multilayer isometric - slot and multilayer anisometric - slot then , the analytics and the fem are utilized to calculate slot leakage reactance of stator winding of prototype of powerformer and compare their results second , the theory of utilitzing fem to calculate the reactance of powerformer is simply introduced , including stable reactance , transient and subtransient reactance specially , the saturated influence of the stable reactance is considered then , the results are analysed final , it mainly introduces the influence of harmonic magnetomotive force of stator winding and analyses the harmonic magnetomotive force of stator winding then , it mainly analyse harmonic magneto - motive force of stator winding through arranging various arrays of stator winding and observe their influence 基于上述原因,本文对powerformer的电磁参数以及定子绕组谐波磁势进行了研究。首先是用解析法推导出powerformer定子绕组槽漏抗的计算公式,考虑了单层圆形半闭口槽、多层等半径圆形半闭口槽和多层不等半径圆形半闭口槽三种情况,并对powerformer样机的定子绕组槽漏抗用解析法和有限元法进行了计算,并比较其结果;其次,简要介绍了有限元法计算powerformer电抗参数的原理,包括稳态电抗、瞬态电抗和超瞬态电抗,对稳态电抗考虑饱和影响,对结果进行分析;最后,介绍定子绕组谐波磁势对电机运行性能的影响并对定子绕组谐波磁势进行了分析。然后通过对定子绕组进行不同排列来分析定子绕组谐波磁势,看看绕组排列对谐波磁势的影响。