three-phase line 中文意思是什麼
three-phase line
解釋
三相輸電線路-
Computation of electrodynamic in the three - phase conducting wires of overhead transmission line under equilateral triangle arrangement
架空輸電線路三相導線正三角形排列時的電動力計算 -
Skilfully use single - phase electric energy meter check - up device examine three - phase line four meritorious electric energy meter
巧用單相電能表校驗裝置檢三相四線有功電能表 -
The main job of this research is : ( 1 ) analyze the operation situation of power system during faults ; pay attention to the traveling wave on the three - phase transmission line ; study the equation of voltage on three - phase transmission line with impedance capacitance coupling between phases ; contact the voltage on any point with the fault voltage, study the singularity of the voltage signal in fault point, and make it to be the base of the new fault detection method ; ( 2 ) apply the singularity detection theory based on wavelet analysis to the power system faults detection, give a complementary criterion to current fault detection criterion, study how to select the basic wavelet, how to filter noise, how to detect the singular point or fault point, and finally give a total solution. the simulations prove it to be a quick, correct and effective fault detection method
本文的主要工作有： （ 1 ）分析電力系統在發生故障時的運行狀態，尤其對三相傳輸線上的故障行波進行了分析和研究，推導了考慮相間耦合的三相傳輸線電壓方程，並將傳輸線上任一點的電壓與故障點電壓建立起聯系，得出了傳輸線上電壓信號在故障點處的奇異性，並以此作為構造新的故障檢測演算法的理論基礎； （ 2 ）將基於小波變換的信號奇異性檢測理論運用於電力系統故障檢測中，針對目前相關研究的不足，提出了電力系統故障檢測判據的補充判據，通過對基本小波的選擇、除噪措施、信號奇異點也即故障點的檢測方法所作的分析，給出了一個可行的解決方案；模擬研究表明：這是一個快速、準確、有效的故障檢測演算法。 -
After that, the author discusses a novel solid states limiting technology and provides a single - phase solid states bridge current limiter and a main circuit topology of three - phase fault current limiter. it can be found that the new type of three - phase solid states bridge current limiter can handle the fault conditions more flexibly. it can not only remove the fault circuit, but also control the value of stable fault current to cooperate with the existing line three - segment relay
繼而，介紹了一種新型固態限流技術，給出了單相、三相限流器的主電路拓撲，分析了其基本工作原理和控制方式，指出以全控橋結構為基礎的變壓器耦合橋式限流器能夠更加靈活地處理電力系統的各種短路故障，及時地限制短路電流，並與現有的線路三段保護相配合，還可根據需要實現及時切除故障電路，在故障恢復時軟重合閘。 -
We discussed the four - legged inverter with space vector modulation ( svm ) to aim at three - phase four - line output ; we introduced the principle of three dimensions svm, and attained the related control scheme. with the illustration of 15kva vscf power inverter, we tested and verified that the inverter system under 3d svm control can realize the three phase four line output and linear voltage regulating
針對三相四線輸出的電源系統，對採用空間矢量控制的四橋臂逆變器進行了深入研究，對三維空間矢量調制方案進行了分析求解、模擬，並給出了適用於15kva變速恆頻電源變換器的解決方案，實現了變換器的三相四線輸出以及線性調壓。 -
By face failure and ground subsidence investigation and in - suit monitoring analysis in some lots of shenzhen metro phase line, especially of lot 3a in which two large ground landlides have occurred in construction, the reasons of ground subsidence are expatiated respectively from three aspects, including the characters of the physical mechanical parameters of stratum above tunnel, the monitoring analysis of stratum deformation and contruction technics causation
通過對深圳地鐵期工程土建施工中全線部分暗挖標段出現的工作面失穩、地表塌陷工程實踐和現場監測結果分析，特別著重對連續2次出現地表塌陷的3a標暗挖隧道研究，從隧道上覆地層物理力學性質參數、地層變形監測分析及施工工藝原因3方面闡述了地表塌陷的原因。 -
At first, the dissertation author analyzes the measure method characteristic of three - phase three - line system and three - phase three - line system by power measure principle, and analyzes all kinds of power theft way, then concluding them to five styles : voltage style, current style, change phase style, enlarge error style, shunt style
論文從電能計量原理和準確計量方法入手，簡要介紹了電能計量的發展歷史，單相電路和三相電路的各種計量方式。其中重點介紹了三相三線經電流互感器和電壓互感器接入式和三相四線只經電流互感器接入式這兩種計量方式。 -
Single load analysis of measured high voltage of three - phase three - line power meter
三相三線有功電能表計量高壓單相負載分析 -
In order to obtain three - phase four - line ac output, system applied the four - legged main circuit topology. with the 3d - svm, the power system realizes voltage regulation and three - phase four - line output. meanwhile, this kind of control is easy to be realized in the digital inverter
為實現三相四線的交流輸出，變換器電路採取四橋臂新型拓撲，其控制採取了三維空間矢量調制，實現了變換器的在線調壓及輸出中點的形成，具有良好的動靜態性能，且這種控制思想可以方便地在現有數字變換器平臺上實現。 -
The design of on - line three - phase input and output variable frequency uninterruptable power supply
在線式三進三出交流變頻不間斷電源的設計 -
The generators are of three - phase four - wire type, making use of star connection with neutral point. the rated line voltage is 400v. phase voltage 230v. frequency 50hz, power factor 0. 8 ( lag ). it can provide 60hz and the other voltage ' s generator according to necessary
本發電機為三相四線制，採用帶有中性點的星接法，額定電壓為400伏，相電壓為230伏，頻率50赫，功率因素0 . 8 （滯后）根據用戶需要，也可提供60赫及其它電壓值的發電機。 -
The three - phase circuit that has balanced three - phase sources, balanced ( equal ) three - phase loads and balanced three - phase line - impedances is called a balanced three - phase system
一個具有對稱三相電源，對稱三相負載和對稱三相線路阻抗的三相電路被稱為三相對稱電路。 -
The conventional rectifiers produce harmonic problem in power system. while three - phase pwm voltage source rectifiers ( vsr ) can provide constant dc bus voltage and get low harmonic distortion of input current. it also has line power feedback capability
傳統的整流裝置是電網污染的主要來源，三相電壓型pwm整流器具有輸出電壓恆定、能實現單位功率因數運行的特點，甚至可以實現電能回饋電網。 -
The dissertation, reseaching on three - phase - three - line power - network, based on the theory of digital signal processing ( dsp ), has done the real - time dynamic simulation of apf using the software of matlab, and the result shows that the method of harmonics detecting and the scheme of current controlling are both pratical and effective. an experimental laboratory prototype scheme is proposed
本論文以三相三線制電網為研究對象，以數字信號處理濾波器設計理論為基礎，使用matlab模擬軟體進行了有源電力濾波器的實時動態模擬，模擬結果表明了諧波電量檢測方法和補償控制方案的正確性；最後設計了一套實驗室樣機系統。 -
Firstly, a relevant algorithm is presented for locating single - line - to - ground ( slg ) fault in distribution networks, fault functions are reasoned out and analyzed for single - phase and three - phase distribution lines, and criterion measure, which are based on the frequency, phase and shape characteristics of the fault function spectrums, are also presented for locating slg faults
首先論文對三相均勻換位線路的故障定位進行了公式推導和數值計算分析，並在頻域內對故障函數的頻譜曲線幅值、相角和頻率特性進行了分析，提出了相應的故障定位判據。 -
Is the stator three phase line voltage the same ? and is it current zero
定子三相電壓是否相等？其電流是否為零？ -
To resolve this problem, this dissertation author researches deeply and makes two preventing power theft devices which be used in three - phase power supply system including three - phase three - line system and three - phase three - line system
針對這種情況，本論文作者針對三相供電系統中竊電及其檢測技術進行了詳細研究並研製了三相四線和三相三線計量防竊電裝置。 -
The testing system improved the testing precision, reduced the infection of the testing people, realized the auto computer control. on the other hand, the testing system can realize the auto manage to the testing data, draw characteristic curve automatically. through the curving line of working characters analyzing the three - phase asynchronous electrical motor ' s functions and qualities
系統大大提高了電機試驗的測量精度和數據處理的準確性，減少了試驗勞動強度和試驗時間，特別是根據試驗數據作某些分析時，大大地減少了人為因素對結果存在的影響，實現了計算機全智能化的自動控制，自動化的數據處理和曲線繪制，並能靈活的查詢及列印試驗報表。 -
We utilize the mutual inductor to take a sample to the three - phase current, and sample which is enlarged, rectified, filtered, is send into pic single chip microcomputer to deal with. the size of three - phase current on the line is calculated out, which offer the accurate value for the change of controls the equipment state
利用互感器對三相電流取樣，然後通過放大、整流、濾波，實現交直流轉換，送入pic單片機處理，計算出溫室輸電線上三相電流大小，為控制設備狀態的改變提供精確數值依據。 -
Short - circuit currents in three - phase a. c. systems - part 3 : currents during two separate simultaneous line - to - earth short - circuits and partial short - circuit currents flowing through earth
三相交流系統中的短路電流.第3部分:兩個獨立的同時線路接地短路部分短路電流流入大地情況下的電流
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