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under voltages
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  电压波动
     By means of two experiments the conditions of sag,swells,under voltages,voltage fluctuations and transient surges are simulated,the disturbance of power quality under these conditions are carried out and the voltage of system under strong noise and interference is monitored and analyzed based on the principle of ICA. The correctness and validity which ICA is applied in monitoring and analysis of power quality are verified by the simulation tests.
     基于ICA的原理通过2个实验模拟了电网中出现电压跌落、电压上升、欠电压、电压波动、瞬时脉冲等电能质量扰动的情况,对含强噪音与干扰的电网电压进行了监测和分析,并用仿真试验验证了将ICA应用于电能质量监测与分析的正确性和有效性。
短句来源
  “under voltages”译为未确定词的双语例句
     Study on the Long Term Stability of ZnO Varistor Element Under Voltages with Different Waveforms which Develep in H.V.D.C. Converter Station
     ZnO阀片在高压直流输电系统换流站内各种电压作用下的长期稳定性问题初探
短句来源
     Testing and analysing the small current characteristics of three kinds of home-made ZnO elements under voltages with different waves, we present a new equivalent circuit for ZnO element.
     通过对三类国产氧化锌电阻片在不同波形电压作用的小电流特性进行测试,分析其规律.
短句来源
     This article indicates that by increasing the field strength of the cable under voltages, PD site may be effectively detected, which helps lowering breakdown accidents of XLPE cables in operation.
     本文提出 :在 XL PE电缆承受耐压的过程中 ,采用提高场强的方法 ,能更有效地发现 PD缺陷 ,从而降低 XL PE电缆在运行中的击穿事故。
短句来源
     However, it is increased obviously under voltages of from 400mV to 800mV and in alkaline and xanthate conditions. The reasons for higher recovery of pyrite are that oxidation reaction,which results in S~0 and S~0_2,takes place on its surface,and that xanthate is oxidized into dixanthogen.
     在碱性、黄药环境中,电位为400~800mV间黄铁矿浮选回收率大幅升高,这是因为在矿物表面发生氧化生成了S0及S02,同时黄药被氧化成双黄药。
短句来源
  相似匹配句对
     The Flashover Characteristics of Insulator Strings under Composite Voltages
     绝缘子串在复合电压下的闪络特性
短句来源
     Under the condition:(H) (?)
     (H) (?)
短句来源
     Under the frame of G.
     文章在G.
短句来源
     The impedance transition of the films was studied under different applied voltages.
     研究了在不同的电压作用下薄膜的阻抗转变规律.
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  under voltages
These limits are needed to protect appliances from medium level over or under voltages which may be sustained for durations of more than 1 minute.
      


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,...

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。

The eonversion coefficient of a TWT can be reduced, when it works at under-voltage condition. Therefore if a section of helix which works at under-voltage condition is added to a TWT, the improvement of AM-PM eonversion coefficient can be expected,then a "doubl taper helix technique" is developed.This paper describes the double taper helix technique and presents a small signal design method. The actual TWT which uses the double taper helix proves that it not only raises the electron efficiency,...

The eonversion coefficient of a TWT can be reduced, when it works at under-voltage condition. Therefore if a section of helix which works at under-voltage condition is added to a TWT, the improvement of AM-PM eonversion coefficient can be expected,then a "doubl taper helix technique" is developed.This paper describes the double taper helix technique and presents a small signal design method. The actual TWT which uses the double taper helix proves that it not only raises the electron efficiency, but also improves the AM-PM eonversion coefficient. Further experiment shows that this technique has other advantages, such as operation at two or three power levels and good depressed collector characteristics.

行波管欠压工作能减小AM-PM转换系数。因此在行波管中加入一段工作于该状态的慢波线应能改善AM-PM转换特性。由此引出了所谓“双渐变技术”。 本文对该技术作了初步分析,实际制管证明了该技术不仅能提高电子效率,而且能改善AM-PM转换特性。并且还具有多电平工作、降压效果好等优点。本文还总结了一套小信号设计方法。

The computer-aided design (CAD) technique is one of important developments in computer application. CAD technique has already become an important branch of computer science. Special language for electronic circuit analysis is the foundation of computer-aided circuit design (CACD) and/or computer-aided circuit analysis (CACA).Electronic circuit analysis language (ECAL), a special language for circuit analysis, is comparatively simple and convenient for engineering application. Statements of ECAL are executed...

The computer-aided design (CAD) technique is one of important developments in computer application. CAD technique has already become an important branch of computer science. Special language for electronic circuit analysis is the foundation of computer-aided circuit design (CACD) and/or computer-aided circuit analysis (CACA).Electronic circuit analysis language (ECAL), a special language for circuit analysis, is comparatively simple and convenient for engineering application. Statements of ECAL are executed explanatorily by FORTRAN language. So far, ECAL can be used to make DC, AC and transient analysis of a circuit, and the results of DC analysis can be regarded directly as initial conditions for AC and transient analysis.Both linear and nonlinear elements can be taken into account in ECAL. Linear elements may consist of resistors, capacitors, inductors, mutual inductors, independent current sources, independent voltage sources and dependent current sources under voltage control or current control. Nonlinear elements may include diodes, transistors and nonlinear resistors. Therefore, this language is suitable to the analysis of linear circuits or systems as well as nonlinear ones.

计算机辅助设计技术是计算机应用的重要发展,是计算机科学的一个重要组成部分。电路分析的专用语言是模拟电路的计算机辅助设计或辅助分析技术(简称为CACD和CACA)的基础。 电路分析语言ECAL是利用FORTRAN语言对语句进行解释执行的一种比较简单,而使用又比较方便的电路分析专用语言,它能对电路进行直流分析、交流分析和暂态分析,而且直流分析的结果可以直接作为交流或暂态分析的初始条件而转入交流或暂态分析。 ECAL语言用接近电路工程人员习惯的输入语句来描述电路,允许使用的元件除常规线性的如电阻、电容、电感、电流源、电压源等以外,还允许使用二极管、晶体三极管和非线性电阻等非线性元件,因此它可以对线性或非线性电路和系统进行分析。 ECAL语言用简单的输出语句来控制分析结果数据的输出形式,它可以是表格、也可以是图形以适应不同的需要。因此它对于工程技术人员来说是一种很有用的分析工具。

 
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