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
據此,對該站進行了
串聯諧振分析和並聯諧振分析,並結合測試數據和有關變電站的運行記錄,指出了導致該站電容器湯6c頻繁燒保險的主要原因是5次諧
波電流含量偏高,引起湯7c放電pt爆炸也是因為7次和9次諧
波電流被放大。針對這些導致湯陰變電站補償電容器故障的原因,提出了相應的諧
波治理措施,包括針對湯6c電容器5次諧
波電流含量偏高的原因,提出了停運湯6c電容器或者通過把湯sc電容器的部分容量併入湯6c電容器(湯sc其餘部分停運)以增加湯6c諧
波承受能力的措施;針對# 2變低壓側7次和9次諧
波電流被放大的現象,提出了在湯7c電容器上加裝一定百分比的
串聯電抗器的措施。
Series reactor is applied to ac power system with rated voltage of 6kv - 63kv and series connected with shunt capacitor banks for restraining wave distortion in grid voltage so as to improving the quality of power system and ensure the safety of its operation. it can restrain harmonic current and surge current in capacitor banks so that the capacitor will operate reliably
Ckdk型
串聯電抗器,適用於6 63 kv電力系統中,與並聯電容器相
串聯,用以抑制電網電壓
波形畸變,從而改變電網質量和保證電力系統安全運行抑制流過電容器組的諧
波電流和限制合閘涌流,從而保護電容器的安全可靠運行。
Dry - type air - cored series reactor is applied to ac power sys - tem with rated voltage of 6kv 10kv 35kv and series connected with shunt capacitor banks for restraining wave distortion in grid voltage so as to improving the quality of power system and ensure the safety of its operation
乾式空芯
串聯電抗器適用於6kv 10kv 35kv電力系統中與並聯電容器組
串聯,用於抑制電網電壓
波形畸變,從而改善電網質量和保證電力系統安全運行,抑制流過電容器組的諧
波電流和限制合閘涌流,從而保護電容器使之安全運行。
The key technique include nip signal ' s generation, serial port 422 communication, control system data acquisition and processing, stationary wave ratio of antenna, sending and receiving signal ' s attenuation of antenna and so on
其關鍵技術包括nip信號產生, rs - 422
串口通信,控制系統各模塊數據採集和處理,機載天線駐
波比及收發信號衰減測量等。
Analysis of non - adjacent channel crosstalk level of awg device induced by random phase errors
波分復用器非相鄰通道
串擾影響的分析
Japan is suffering from economic recession. the government has passed a law called " battle royale " in which a group of students is to be taken to an isolated island where they have to kill each other
大逃殺未上映先轟動,一連
串的禁映爭倫風
波不但沒有減低電影的吸引力,相反令到更多人爭相搶著看此片一窺固中奧妙。
Abstract : according to the continuative condition of the tangential fields on the slot aperture which is the inclined narrow - slot on the broadwall of a sectoral waveguide, the moment method is used to calculate the magnetic current coefficient and distribution. then the scattering field, the scattering parameter and the equivalent impedance are obtained. leting only the te11 dominant mode propagates in the waveguide, the scattering parameters and the normalized equivalent series impedance in the x - band are computed. the basis disigned the slot antenna and the slot array is offered
文摘:根據縫隙口面切向場的連續條件,採用解析數值法矩量法,對扇面
波導寬壁上窄的斜縫進行了計算,解得了磁流系數及其分佈,並得到散射場、等效散射參量及等效阻抗等重要參數.假定
波導中僅有te11主模傳輸,在x
波段計算了散射參量和歸一化等效
串聯阻抗,給出計算結果,為縫隙天線和縫隙陣列設計提供了依據
Crosstalk of colour subcarrier
彩色副載
波串擾
Numerical simulatiom of the shock train structure in the supersonic diffuser
超聲速擴壓器中激
波串結構的數值模擬
Finally, the two dimensional flow in the diffuser is calculated, the results show that the change of ma makes an effect to the performance of the diffuser. owing to the accretion of ma, the action of oblique shock waves and the boundary layer pricks up, the flow separates from the wall where the shock waves impinge on the boundary layer more quickly, the cluster of diamond shock waves becomes larger. moreover, by comparing the change of flow field under different structure parameter, it is found that the augment of length of constant area section alter the structure of fluid field little, a smaller area ratio and larger angle of compression section make the diffuser working better
最後,針對擴壓器中的二維流場進行了數值模擬,結果表明馬赫數對擴壓器性能影響較大,隨著馬赫數的增大,擴壓器管道內激
波-附面層干擾加劇,流動從附面層分離相應加劇,激
波串數目增多;通過比較不同結構參數下的擴壓器內流場,發現等直段長度的變化幾乎沒有改變流場結構,只是對局部流場稍有影響,並且在其它參數不變的情況下,一定范圍內減小面積比a2 / a1和增大收縮角有利於擴壓器性能的提高。
The configuration of the diffuser should be designed as a channel to allow the main flow pass through a shock train
擴壓段的形狀應設計成能使主氣流通過系列斜激波串減速的通道。