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parameters
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  参数
    Calculation of Static Parameters of Inverter for Faraday Type MHD Generator
    法拉第型磁流体发电机逆变器的静态参数计算
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    The Calculation of Parameters of Pole-Changing Salient-Pole Synchronous Machines
    变极凸极同步电机的参数计算
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    The Parameters Equations of a D.C.Machine and the Design of Armature with the Algebraic Method
    直流电机的参数方程和代数法电枢设计
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    Analysis of Two-parameter TRV and Calculation of Circuit Parameters in Short-circuit Test
    断流容量试验回路中二参数瞬态恢复电压的分析及回路参数的计算
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    High Frequency Parameters of a 500KV Transmission Line
    平武500千伏超高压输电线路的高频参数
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  参量
    Convergence Problem on the Numerical Calculation of Tooth Layer Magnetic Parameters of Step Motor
    步进电动机齿层磁参量数值计算的收敛性问题
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    Study on a Test System of Linear CCD Photoelectronic Parameters
    线阵CDD光电参量测试系统的研究
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    Crystal structure parameters and superconductivity in copper oxides
    铜氧化物的晶体结构参量与超导电性
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    Electric parameters test for asynchronous motor in AC-DC-AC variable frequency speed control drive system
    交直交变频调速传动系统异步电动机电参量测试的研究
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    A NEW METHOD OF CHARACTERISTIC PARAMETERS OF SECOND ORDER PLL
    二阶PLL特性参量的一种新测试方法
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  “parameters”译为未确定词的双语例句
    The Choice of Circuit Parameters for the Measuring Equipment of Rectified Alternative Peak Voltage Possessing the Capacitance Voltage Divider
    关于具有电容分压器的整流式交流峰值电压测量装置的参数选择
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    Mosaic fragmentation and length range order parameters in FeAl intermetallic compound of type B_2 in the process of ball grinding mills
    球磨中B_2型FeAl的嵌镶碎化和长程有序度
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    The Study of Measurement Method of Chromaticity Parameters for Sport Lighting
    体育照明光色现场测量方法的研究
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    The Effect of Saturation of Parameters of a Large Turbogenerator on the Calculation of Torsional Vibration
    大型汽轮发电机饱和对扭振计算的影响
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    Influence of the Controlling Parameters on Dead-Time Effects in PWM Inverters
    PWM逆变器的控制参数对死区效应的影响
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  parameters
The essential dimension is a numerical invariant of the group; it is often equal to the minimal number of independent parameters required to describe all algebraic objects of a certain type.
      
We show that the structure of a block outside the critical hyperplanes of category O over a symmetrizable Kac-Moody algebra depends only on the corresponding integral Weyl group and its action on the parameters of the Verma modules.
      
Quantitative parameters in an analog of the Beurling-Pollard theorem differ from those for A.
      
Quantitative parameters in an analog of the Beurling-Pollard theorem differ from those for A.
      
In this article we consider the question when one can generate a Weyl- Heisenberg frame for l2(?) with shift parameters N, M-1 (integer N, M) by sampling a Weyl-Heisenberg frame for L2(?) with the same shift parameters at the integers.
      
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It is, quite a laborious work to make an analysis and calculation of the performance of the extra long-distance trantmission line. Using the new equivelant circuit as shown in fig.I. the analysis and calcuation work can be simplified a great deal.Each element in fig.I.is represented as in the following: a──negative phase -shifting element; b──losing element; c──ideal element; d──positive phase-shifting element. It is worth mentioning,however,that the element b and c are intecchangable in position,without causi8ng...

It is, quite a laborious work to make an analysis and calculation of the performance of the extra long-distance trantmission line. Using the new equivelant circuit as shown in fig.I. the analysis and calcuation work can be simplified a great deal.Each element in fig.I.is represented as in the following: a──negative phase -shifting element; b──losing element; c──ideal element; d──positive phase-shifting element. It is worth mentioning,however,that the element b and c are intecchangable in position,without causi8ng the slightest effect on each terminal of the line.Therefore we may select the position at will according to the conveniency of calculation. Using the equivelent circuit we can determine the uoltage and current on any point of the line which sustains losses.For example,the voltage and current in point X (fig.2)is determined by: is the uoltage and current at the point x of the line after the later eing idealized. By employing the equivelent circuit we can greatly simplify our work in determin- in the loseses in the transmission line.As in Fig.I we have Since the Sh βι and Sinξ is very small in value ,its high power can be neglected,these we obtained No less a conveniency and simplicity will also be found,if we use the equivelent circuit to determine transmisson line with any compensated parameters.

在远距离交流输电线中,运行特性的分析和计算是很复杂的。 应用图 1的新的等值电路,可以简化上述计算。其中各环节的名称如下: a──负的移相环节; b──损耗环节; c──理想环节; d──正的移相环节。 值得指出,其中b和c两环节具有互易的特性,亦即他们的位置互易时,不影响线路两端的运行特性。计算时可视方便,任意选择他们的位置。 应用此等值电路 ,可以求得有损耗线路上任意一点的电压和电流.例如在图2中,X点的电压和电流为其中为线路理想化后X点的电压和电流。应用此等值电路,也极易求得线路的功率损耗。假如图1线路中的功率损耗为因为 Shβl及Sin 均很小,他们的高次方可略去,则应用这种等值电路分析补偿线路的运行特性也极方便。

Under-frequency load-shedding relays are usually installed in a district power system at the receiving end of a transmission line to restore the normal operation of generators after isolation from the main system, causing active power deficiency. Such relays are usually set to operate when the frequency falls below 48 cycles per second. However, practical operating experiences have shown that, if such power deficiency exceeds a certain limit, then the frequency may not fall below 48 cycles per second, so that...

Under-frequency load-shedding relays are usually installed in a district power system at the receiving end of a transmission line to restore the normal operation of generators after isolation from the main system, causing active power deficiency. Such relays are usually set to operate when the frequency falls below 48 cycles per second. However, practical operating experiences have shown that, if such power deficiency exceeds a certain limit, then the frequency may not fall below 48 cycles per second, so that under-fretjuency relays cannot operate. In this paper, the various formulae to determine the drops of frequency and voltage are investigated, the effects of various load characteristics are discussed, and it is concluded that the voltage drop will seriously affect the drop of frequency. It is recommended that three-phase under-voltage relays -with time delay should be used in combination with under-frequency relays in a district power system with ordinary parameters, when "active power deficiency" exceeds 30-40% after isolation from the main system. The reasons for different frequency and voltage drops under various abnormal conditions in a district power system are also analyzed.

受端电力系统中一般装有低周率自动解列装置或自动减负荷装置,以便在送电线路解列后,根据有功功率缺额和周率下降情况,迅速切除一部份负荷,以恢复地区发电机正常运行。但是,实际运行经验指出:若“有功功率缺额”超过一定程度,则周率反而不能下降到48周/秒以下,因此低周率继电器不能起到应有的保护作用。本文讨论了决定周率和电压变化的公式,分析了不同负荷特性的影响,并指出了电压下降是造成周率变化不同的主要原因。通过对于典型受端系统在不同条件下周率和电压下降的计算分析,作者建议:一般受端系统在解列后“有功功率缺额”超过30~40%者,就应考虑装设三相低电压自动解列或减负荷装置,以迅速切除负荷,确保安全供电。文中还分析了同一受端系统解列后周率和电压下降有时不同的原因。

In this paper, optimum control problems are studied according to the practical restrictions existing in the d. c. motor driving system. The optimum control processes for various cases of restrictions are discussed. Based on the parameters and technical data of the driving system, some formulae and diagrams are given to determine the influenced region of the restriction and the corresponding optimum control process.

本文从电动机本身实际存在的各种限制条件出发,系统地阐明在各种不同情况下相应的最佳控制规律。同时分析和研究了根据给定的具体参数,判定起作用的限制条件和确定相应的最佳控制规律。 文中给出根据生产机械和电动机的参数和工艺数据,判定哪些限制条件起作用的公式,以及相应的图表。根据这些公式和图表,能够判定各种限制条件起作用的区间和找出相应的最佳控制规律。

 
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