selection switching 中文意思是什麼
selection switching
解釋
選擇開關-
By using phase shifting control between right bridge leg and left bridge leg, the output cy cloconverter commutating while the bi - polarity three - state high frequency ac volage from the input cycloconveter is zero, . and commutation overlap of the output cycloconverter and polarity selection of the input voltage, the leakage inductance energy and the output filtering inductance current are naturally commutated, and zvs switching of the output cycloconverter are realized, the surge voltage and surge current of the output cycloconverters are overcome
通過輸入周波變換器右橋臂相對左橋臂的移相，讓輸出周波變換器功率開關在輸入周波變換器輸出的高頻交流電壓為零期間進行換流，並藉助輸出周波變換器換流重疊和輸入電壓極性選擇，從而實現了變壓器漏感能量和輸出濾波電感電流的自然換流、輸出周波變換器的zvs開關，解決了輸出周波變換器固有的電壓過沖和環流問題。 -
It emphases the selection of secondary voltage of the step - down transformer, the control and protection of thyristor, the calculation of compensation capability and group capability, the technique of cross - zero switched on / off capacitors or reactor, the solution of avoiding possible resonance in switching on / off groups of capacitors or reactor and the measure of the best time to switch ( including the design of the computer survey and control system, instrument deliver system, delay operate and protect system ). although thyristor as a no - contact switch can avoid almost the problem of contact switch with contact, it can not solve the over - voltage, over - current and transient process itself as switching on / off capacitors or reactor. so we must develop a set of thyristor - switched control and protect system with great reliability so that it can realize of cross - zero switching on / off capacitors or reactor at any time
晶閘管具有過零、動作快速的特點，本研究以晶閘管為電容器和電抗器的分組投切開關，重點研究了協調變壓器二次電壓的選擇、晶閘管觸發控制及保護、動態補償容量及分組容量的計算確定、過零投切電容器和電抗器技術的實現、以及分組投切電容器和電抗器可能發生諧振的處理計算方法，給出實現最佳補償投切選擇方法（測控系統、儀表變送系統、操作和保護系統的設計步驟） ，研製了一套高可靠性晶閘管觸發控制及保護系統，實現對無功的靜止可調補償。 -
Input ports have universal signal input function, it can realize light switching between various input signal thermocouple, thermo - resistance, standard voltage current signal only need simple selection on instrument menu
由於它採用二線制國際標準信號輸出，可以與控制計算機和各種二次儀表介面，並且有較高的抗干擾能力。 -
They only need to simple selection by instruments menu when input signal is full switching, namely can realized lightly switching in different type input signal a variety of thermocouple, thermo resistance, standard voltage current signal, and improved universality and reliability of instrument
輸入埠均具備萬能信號輸入，只需通過儀表菜單的簡單選定，即可實現不同類型輸入信號各種熱電偶熱電阻標準電壓標準電流信號之間的輕松切換，提高了儀表的通用性和可靠性 -
It can separate display and control simultaneously for two - loop signals which can be different signal. input ports all have universal signal input, it can realize light switching between various input signal thermocouple, thermo - resistance, standard voltage current signals by making simple selection on instrument menu. such feature greatly improves its universality and reliability
採用最新無跳線技術，使輸入埠具備單通道和萬能信號輸入功能，只需通過儀表菜單的簡單選定，即可實現多種輸入信號各種熱電偶熱電阻標準電壓標準電流信號之間的輕松切換，提高了儀表的通用性和可靠性。 -
Through the results, the electrical life of the five kinds of contact materials under different conditions when they are symmetrically matched were analyzed and studied from the loss of quality and extent of cracks, and they were compared with the electrical life of the same material under the same conditions when they are asymmetrically matched this will guide the selection of materials used in switching apparatus
通過實驗結果，從觸頭質量損失量和觸頭表面出現裂紋的程度兩方面分析和研究了它們對稱配對時在不同條件的電壽命，並和相同條件下同種材料非對稱配對時的電壽命進行比較，從而為開關電器中材料的合理使用提供指導。 -
Selection and application of automatic transfer switching equipment
區域聯鎖選擇性保護裝置的原理與應用 -
Method of optimal selection and location of switching devices in distribution power system distribution automation is the inevitable result of technical advancement
二、配網開關設備優化配置與定位方法的研究配電自動化是技術進步的必然結果。 -
Core losses are caused by an alternating magnetic field in the core material, thie losses are a function of the operating frequency and the total magnetic flux swing, the total core losses are made up of three main components, hysteresis eddy current and residuallosses, these losses vary considerably from one magnetic material to a - nother, applications such as higher power and hither frequency switching regulators and rf designs require careful core selection to yield the highestinductor perfor - mance by keeping the core losses to a minimum
鐵損是由於在鐵芯中的變更磁場院所造成，這個損失與操作頻率及總流動的磁通量有關，總鐵損由三個成份組成，磁滯損，過流損及殘留損，這些損失因磁性材料不同而異，在如高功率切換調整器和rf的設計需要小心選擇鐵芯種類以降低鐵損使電感的表現最佳。 -
According to the total requirments of the ecs, a compensate way of shunting capacitors can be properly chosen which is compatible to the system by analyzing the reactive compensate theory and comparing compensate ways systematically. the thesis makes deep and comprehensive studies about the selection of the control methods and the control physical parameters and establishes a reactive power compensate control strategy to avoid possible power oscillation when switching compensating capacitors
根據整個系統對無功補償的總體要求，首先對無功補償理論和各種無功補償方式作了一個系統的分析和比較，選擇並聯電容器作為本系統的無功補償方式，對控制方法和控制物理量的選取做了詳盡、深入的研究，制定了無功補償控制策略，有效地避免了投切振蕩。 -
Genetic algorithm ( ga ), developed by american professor j. holland, is a sort of randomly searching algorithms which originated from the creature rule - nature selection and genetic mechanism, and has a main characteristic which is that the group searching strategy and the switching and searching for message between individuals are independent of gradient information
遺傳演算法由美國教授j . holland提出，它是一類起源於生物選擇和遺傳機制的隨機搜索演算法。遺傳演算法的主要特點是群搜索策略以及個體間信息交換和搜索不依賴梯度信息，它特別適合於傳統方法難于解決的復雜和非線性問題並廣泛應用於機器學習、自適應控制、組合設計、人工智慧等領域。
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