line switching 中文意思是什麼
line switching
解釋
通道轉換-
Interoffice junction digital line signalling system for telephone automatic switching network
電話自動交換網局間中繼數字型線路信號方式 -
This thesis built the models computing the working frequency over - voltage " operation over - voltage for 220kv fugai transmission line, calculates and analyzes working frequency over - voltage " operation over - voltage using emtp program and provides reasonable protection measures for the transmission line. furthermore, regulations method, traveling wave method and striking distance method are used to study and compare lightning - enduring capabilities of different types of pole in power transmission lines aiming at the fact that the lightning strike switching rate of 220kv fugai line is higher
本文分別建立了計算220kv復蓋線路的工頻電壓升高及操作過電壓的計算模型，利用emtp程序對220kv復蓋線路工頻電壓升高、投切空線過電壓、投切空變過電壓、單相故障過電壓進行計算分析，並提出合理的防護措施。 -
For the circuit - breakers of rated voltage 252kv up, the synthetic test methods are introduced according now condition because of the limitation of the transformer short - circuit capacity. the correlative prescribes on switching line - charging current in gb / t1984 - 200x " alternating - current high - voltage circuit - breaker " are discussed according to the test results and theoretic analysis
由於開合空載架空線路試驗對電源側的阻抗有明確的規定，這就要求試驗電源必須具有足夠大的短路容量，實驗室很難滿足要求，因此，一般對較高電壓等級的斷路器採用合成試驗方法，本文介紹了利用現有條件，對252kv以上電壓等級的斷路器採用合成試驗時的試驗線路。 -
Various factors that influence lightning strike switching rate are also analyzed. it has been showed that for some given configuration, all lightning over - voltages on substation equipments do not exceed the 1ightning strike insulation level in the case of invading waves out of lightning strike aerial input protection line
同時利用規程法、行波法、擊距法對輸電線路中不同桿塔型號的耐雷性能分別進行了研究和比較，對影響輸電線路雷擊跳閘率的各種因素進行了分析。 -
The conventional switching power supply usually use a diode rectifier followed by a bulk capacitor to convert ac voltage to dc voltage, resulting in the pulsating waveform of the input ac line current, low power factor ( generally 0. 65 ) and high harmonic line current
傳統的開關電源設備通常採用二極體橋來進行整流和一個較大的電解電容來進行濾波以實現輸入電壓的交直流轉換，導致輸入電流為一個很窄的脈沖波並含有較多的諧波分量，功率因數變低（通常只有0 . 65 ） 。 -
The optimization objective is to minimize the entire system ' s line loss per day, and the permissible number of equipment switching is considered as the constraint in this model
針對計算模型，基於遺傳演算法的思想，設計了相應的編碼、雜交和變異操作。 -
Based on the engineering experience in guangzhou metro line 1 and line 2, the schemes of mobile communication system switches in various conditions are discussed, including switching between plots in the tunnels, between upper floor and lower floor in the interchange station, between inside and outside of the interchange stations and between tunnels and floor
摘要結合廣州地鐵1 、 2號線工程經驗，對地鐵移動通信系統的各種條件下的切換方案設計進行探討，包括隧道間小區切換、換乘站的上下層切換、站內和站外切換、隧道和地面切換等。 -
The results of test and measurement show that the insulating lift is of great insulating ability, low starting pressure, and good stability during actuation switching, satisfying the actual application demands of hot - line cleaning robot
試驗及測量結果表明平臺具有很好的高壓絕緣性能，且平臺起升時工作壓力很小，接力時過渡平穩，滿足了帶電清掃機器人的實際使用要求。 -
On top of its conventional activities of signal magnification, reshaping, filtering, sampling, a / d transformation and scale switching, the intelligent sensor system can perform kinds of advanced operations such as on - line storage of parameters, real - time data processing, self - diagnosing of the system and so on. because of its communication interface with pcs, it serves as intelligent plug & play network sensor
它除了能完成對傳感敏感器件的信號進行放大、整形、濾波、采樣、 a d變換及標度變換外，還可實現參數在線存儲、數據實時處理、系統自我診斷等功能，並可以通過其通訊介面與溫室現場總線相接，組成即插即拔的智能網路傳感節點。 -
This creates more conflicts and task - switching, as illustrated in figure 8 by the dotted line and the wider yellow stripe indicating a longer period of resource conflict
這創造了更多的沖突和任務交換，圖8中用點畫線和黃色條顯示，暗示了一個更長的資源沖突時期。 -
When switching the no - load overhead lines by alternating - current high - voltage circuit breaker which is a kind of daily operations in electric power system, over - voltage is probably bringed out and insulating property of the electric devices is breakdowned sometimes, especially, when occuring re - strike. the main purposes that the tests on switching line - charging current are performed in the laboratory are assessing re - strike performance of circuit - breakers. according to the test results, the design of the circuit - breaker is optimized and re - strike performance is improved
交流高壓斷路器是電力系統中最關鍵最重要的設備之一，斷路器開合空載架空線路是電力系統中常見的操作，操作過程中通常會出現過電壓，對系統絕緣造成威脅，嚴重時會破壞系統的絕緣性能，發生事故，隨著電力系統電壓等級的提高、輸電線路不斷延長及傳輸容量的增大，由操作過電壓引起的絕緣閃絡、設備破壞事故的幾率更加突出。 -
If railroads charged all customers the same average rate ， they argue ， shippers who have the option of switching to trucks or other forms of transportation would do so, leaving remaining customers to shoulder the cost of keeping up the line
他們爭論說，如果對所有的客戶都收取一樣平均的費用，那些可以轉向公路或者其他交通手段的發貨商就會這么做，致使剩餘的客戶承擔維持鐵路經營的成本費用。 -
A novel self - bias high - voltage device structure for the start - up circuit of an off - line switching model power supply ic is described
摘要設計了一種新的用於離線式集成開關電源啟動電路的自偏置高壓器件結構。 -
Subscriber line signaling system for telephone automatic switching network
電話自動交換網用戶信號方式 -
Therefore, the main contents and the creative results of this paper are described as follows : ( 1 ) the on - line safety forecast theory for switching overvoltage of large power stations based on the field - circuit analysis is presented by analyzing the electromagnetic transient for electric network of large power stations
針對該研究課題，本文的主要內容及創新性成果如下： （ 1 ）通過對大型電站電氣網路電磁暫態過程的分析研究，提出了一種基於場路綜合分析的廠站操作過電壓在線安全預測理論。 -
Based on the investigation of analysis methods for the overvoltage striking on rotating electric machines and its research status at home and abroad, the safety forecast theory and the analysis method for the switching overvoltage of large power stations are firstly presented based on the field - circuit analysis, and the transient field distribution and the insulation condition in the stator winding insulator stricken by the switching overvoltage in large power stations are studied and analyzed on line
本文在分析和總結國內外關于旋轉電機過電壓分析方法及其研究現狀的基礎上，首次提出了基於場路結合的廠站操作過電壓安全預測理論和分析方法。本文研究了大型電站中的操作過電壓沖擊波在發電機定子繞組絕緣介質中暫態電場的實時分佈狀態，在線分析發電機的絕緣工作狀況，搜索發電機內部可能突發絕緣事故的區域，預測發電機內部可能發生絕緣事故的故障點，並重點研究了大型發電機絕緣安全在線預測分析方法和建立了大型發電機絕緣安全評估模型。 -
Therefore, in order to protect large generating equipment against the switching overvoltage, the research on safety forecast theory and real - time monitoring technique for the surge overvoltage of large power stations has not only importance and benefit to safety operation of generators, but also has the great importance for the engineering of transferring electricity from the west to the east in china and the safety operation of large electric power network with great capacity and long - distance transmission line
因此，針對廠站操作過電壓對大型發電設備的沖擊問題，重點開展廠站操作過電壓的安全預測理論與實時監測技術的研究，不僅直接對大機組安全運行有著重要的現實意義，而且對目前我國西電東送工程的實現和確保大容量遠距離輸電電網的安全穩定運行都具有十分重要的意義。 -
With the increasing of the load and existance of the higher voltage scale, the reactive power transformation caused by the line switching and load changing is more and more common. therefore, the ability to regulate and control the voltage and reactive power should be advanced
隨著電網負荷增大和電壓等級提高，線路投切、負荷變化等將容易引起較大的無功功率變化，因此對電網無功和電壓的調節、控制能力要求越來越高。 -
Using this novel start - up circuit structure for the off - line switching model power supply ic can save the cell area, reduce the power consumption of the circuit, and easily control and supply the larger output voltage
採用該結構集成開關電源的啟動電路可以節省晶元面積，降低電路功耗，易於控制且可提供較大的晶元內部電源電壓。 -
Automatic line switching
線路自動轉換
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