Circular electric current is a classical physical model. The researches on the magnetic field distribution characteristics of the circular current are helpful for the further study on magnetic characteristics of magnetic dielectric. The ellipse electric current is a typical physical model of ring-like electric current.

圓電流是一個經(jīng)典的物理模型，對圓電流磁場分布特性的研究有助于進(jìn)一步研究磁介質(zhì)的磁性特征亚洲毛片无码专区亚洲乱；而橢圓形電流又是環(huán)形電流中一個典型的物理模型,人人综合操，對橢圓形電流磁場分布情況的研究，將讓我們進(jìn)一步認(rèn)識環(huán)形電流的磁場問題午夜一级一级www.。

Due to capacity increase or structure change of the power system, an extra-high current possibly 100 times of the rated current may appear in some circuits of the power system when a short-circuit fault happens nearby. This current is extra high and exceeds the permitted value of 10% error curve of protection current transformer.

在電力系統(tǒng)中亚洲一级毛片无码久久精品，各回路的最大故障短路電流和額定工作電流的比值應(yīng)在合理的范圍內(nèi)，以保證保護(hù)用電流互感器的工作精度国产女人高潮免费视频，但由于系統(tǒng)容量增大或因系統(tǒng)結(jié)構(gòu)等原因欧美国产日韩水多，某些回路在某些情況下的最大故障短路電流遠(yuǎn)遠(yuǎn)超過了正常范圍。

Moreover, second-winding current waveform of a current transformer is calculated under the transient current of the typical short-circuit fault by numerical method. The analysis shows that the relevant protection equipment may refuse to trip when the fault current is extra high. It will result in the maloperation of protective relays for loss of their selectivity, and cause other protective relays to operate beyond range, and extend the scope of shutdown of power supply.

在這些回路出口處發(fā)生相間直接短路等嚴(yán)重故障時男女羞羞视频，流過相應(yīng)TA一次側(cè)的故障電流可能達(dá)到TA額定工作電流的100倍以上欧美极品网站在线观看免费高清，大大超過了保護(hù)用TA的10%誤差容許倍數(shù)，將使TA嚴(yán)重飽和AV毛片免费久久久久性色，從而影響相關(guān)的保護(hù)設(shè)備的動作性能1024手机看片金沙久久国产，因此有必要對在這種特大電流作用下的TA的傳變特性做一些探討，以分析其對繼電保護(hù)裝置動作特性的影響及應(yīng)采取的措施日韩一级黄片一区二区。

We have found that, within the physical ranges of the model parameters, the correlation functions of hole hoppings giving rise to closed current flow patterns in the circulating current phases are substantially larger than those of hole hoppings corresponding to open current flows. This provides the evidence for the existence of the circulating current phases in the three-band Hubbard model.

通過模擬發(fā)現(xiàn)国产a片一级毛片网站，對應(yīng)于閉合曲線的關(guān)聯(lián)函數(shù)在同一距離上要比其他所有沒有閉合的關(guān)聯(lián)函數(shù)大得多，因此證明在三帶Hubbard模型中存在環(huán)形電流相欧美一级特黄AAAA片免费。

Using harmonic analysis of the calculated tidal level and current, the distributions of co-tidal lines for K1, O1, M2 and S2 are obtained, whose maximum amplitudes can reach 112 cm, 96 cm, 50 cm and 15 cm, respectively. The distribution of the maximum probable current velocities in Qinzhou Bay is basically the same as that of isobaths, and the maximum probable current velocity can reach 200cms^(-1) nearby the Longmen Harbor. It is concluded by the analysis of K1 and M2 tidal current ellipses that the flow is rotating at the mouth of the bay, while its retilinear flow is in the nearshore area, estuaries and channels. The distributions of the major axes are closely related to the topography, and the rotation directions of both constituents are clockwise.

根據(jù)模擬結(jié)果計算得到了較以往更為精細(xì)的欽州灣K1wwww性、O1、M2igao在线观看免费观看、S2分潮的同潮圖欧美色83p，潮汐最大振幅分別為112、96www.九九爱、50和15cm外国a色网站；最大可能流速的分布基本與等深線一致三级欧美日韩第一页，龍門港附近最大可能潮流流速可達(dá)200cms^(-1)；欽州灣的外灣口海域開闊国产精品91一区二区三区，一般為旋轉(zhuǎn)流国产狼友91精品一区二区三区，近岸海區(qū)及水道、河口等多為往復(fù)流久久精品免费图片欣赏大全AV，K1和M2分潮流橢圓長軸的分布與地形密切相關(guān)人人澡人人插人人射，旋轉(zhuǎn)方向均為順時針，流速極值出現(xiàn)在龍門港區(qū)日本乱人伦A片免费高清。

Other conclusion include: the trip of transient protection must be locked when the power circuit breaker of transimission line operated,because the trip is incorrect at this time;the features of transient current and its energy is different between the fault and thunder over- voltage in transimission line,and them can be identified;the ratio of high frequency component of current in serise capaciters compensation line , SVC and HVDC system is far little than fault transient current, so all of them do not affect the working of trasient current protection.

研究了在串聯(lián)補(bǔ)償電容的輸電線路上發(fā)生故障時久久福利精品国产极品刺激，串聯(lián)補(bǔ)償電容的MOV非線性保護(hù)電路對暫態(tài)保護(hù)的影響。串補(bǔ)電容MOV保護(hù)電路的非線性電流高頻分量含量很小思思99精品视频。靜止補(bǔ)償器性交a级视频免费看、高壓直流輸電系統(tǒng)換流器的非線性特性產(chǎn)生的諧波分量含量極少。仿真計算表明影音先锋全部AV资源，在與暫態(tài)保護(hù)判據(jù)中高頻分量對應(yīng)的頻率范圍內(nèi)a片在线观看资源，其電流對應(yīng)的功率譜估計值大大低于線路故障時故障電流的功率譜估計值，因此它們都不會對暫態(tài)電流保護(hù)的正常工作產(chǎn)生影響88色哟哟。

In this paper, the rotary spectra of sea current and residual current are calculated for the data of cunent vector time series acquired through a mooring buoy located at (114°20.5'E, 20°04.8'N). Subsequently, the preliminary analysis for the internal structures of current in this area is done from these results of calculation and a lesidual current with a three days period is found in this sea area.

本文利用本所水文氣象研究室在東沙群島西南海域投放的一個錨定浮標(biāo)(114°20.5′E，20°04.8′N)所獲得的一系列海流流速矢量觀測資料亚汌人成伊人成综合网222，用旋轉(zhuǎn)譜分析方法對該站海流的內(nèi)部結(jié)構(gòu)作初步的探討人人爱人人操人人搞，并由此得到該站海流的某些運動學(xué)特征。

The boost converter is a voltage step-up and current step-down converter .the current source is synthesized from a DC voltage source by adding a large value inductor in series .in DC regulated power supply applications ,the voltage sink represents a large value capacitor in parallel with the load resistance .in the application of the DC motor control ,the voltage sink represents the back emf of the DC motor .the switching action produces a pulsating current .the capacitive filter smoothens the pulsating current and provides a DC voltage to the load

升壓轉(zhuǎn)換器是一個升壓和降流的轉(zhuǎn)換器日本特级特黄aaaa大片。電流源是一個直流電壓源添加一個大值電感串聯(lián)合成的蝌蚪网在线视频。在直流穩(wěn)壓電源的應(yīng)用，電壓降代表一個大值電容并聯(lián)一個負(fù)載電阻aaaa片。在直流電機(jī)的控制應(yīng)用中A片无卡不码国产在线，電壓降代表反電動勢的直流電機(jī)。轉(zhuǎn)換行為產(chǎn)生一個脈動電流欧洲九月天性爱黄色性爱网站。一個濾波電容是這個脈動電流平和并且提供直流的電壓負(fù)荷欧美精品视频二区免费播放。

According to the experimental data, it can be seen that the current transformer this paper designed could work reliably. At the range of -40~70 oC, it can work steadily. Furthermore the ratio error and phase error of current transformer could satisfy the state criterion of 0.2 standard. Relative to the tradition electromagnetic current transformers the respond speed and bandwidth are increased greatly. As a result, it is hopeful that the electronic current transducer we designed is practical.

經(jīng)試驗驗證，本課題設(shè)計的電子式電流互感器工作可靠亚洲性在线免费观看视频，在-40~70 oC溫度范圍內(nèi)均能穩(wěn)定工作av.bbixx，而且其比差和相差都滿足國標(biāo)中對 0.2 級電流互感器的要求，其動態(tài)響應(yīng)速度久草美女不骓视频、帶寬等性能明顯比傳統(tǒng)電磁式電流互感器有很大的改進(jìn)男人女人爽到高潮视频真人版，因此其有望很快進(jìn)入實用化階段。

The principle of the novel single-phase hybrid active power filter is described in detail. Based on the above analysis, Kalman filtering approach for estimation of harmonics is presented to improve the speed and precision of harmonic detection, and it also can avoid the influence made by voltage distortion on harmonic detection. A new current control strategy based on energy balance is presented to regulate the active part absorbing or releasing active power and control the inverter to produce current opposite to the harmonic current reflowing in injection branch, the above method combined with harmonic current tracking control that keeps the stabilization of dc-side voltage and improve the reliability of the system.

并詳細(xì)分析了系統(tǒng)的濾波原理在线免费A片，提出了基于卡爾曼增益自調(diào)整的改進(jìn)型動態(tài)諧波含量估計方法欧美福利片500，能夠快速準(zhǔn)確的跟蹤檢測電網(wǎng)諧波電流欧美亚洲福利，并且克服了電力機(jī)車等沖擊性負(fù)荷引起的電網(wǎng)電壓畸變對諧波檢測精度的影響；提出了基于逆變器兩側(cè)能量平衡的電流控制方法使有源部分吸收或釋放一定有功或無功功率及產(chǎn)生與注入支路回灌諧波電流相反的抑制電流欧洲黄色视频在线观看，然后聯(lián)合電網(wǎng)諧波電流跟蹤控制以獲得系統(tǒng)參考信號欧美精品熟妇人妻在线视频，保證了直流側(cè)電壓的穩(wěn)定，提高了裝置可靠性人人干人人摸视频网站，增強(qiáng)了系統(tǒng)濾波性能自拍第一页。