查询词典 power frequency

The working frequency: frequency of demanding action, the structure should be optimized direct-acting solenoid valve, the power to listen to the exchange preferred.

三、事情频率：动作频率要求高时，布局应优选直动式电磁阀，电源听优选交流。

This module consists of two stages frequency doublers, a bandpass filter between two frequency doublers and a millimeter wave power amplifier with a microstrip of waveguide transition.

该文设计了一种Q波段宽带四倍频放大组件，该组件包含两级二倍频器、两级之间的带通滤波器和一级毫米波功率放大器，最后通过微带到波导过渡输出。

The communication systems wildly used nationally and internationally, such as audio frequency wire communication, carrier-current communication, micro-wave communication, optic-fiber communication, expanding frequency communication and satellite relay communication, are investigated in detail. The different communication systems used in Changsha County electric power systems are analysed in detail.

对目前国内外使用较多的一些通信方式如音频线通信、载波通信、微波通信、光纤通信、扩频通信、卫星帧中继通信等进行了较为深入的分析和研究；对目前长沙电力局正在使用的变电站与调度端的通信方式——进行性价比方面的分析比较，综合以上，得出了最为合适的变电站到调度端的通信方式。

In MicroGrid if traditional synchronous generators were used as the main power support, the frequency of MicroGrid would fluctuate greatly during MicroGrid operated from isolated mode to grid-connected mode, and some distributed generations maybe were disconnected from the grid by low frequency relay.

如果选择微型燃气轮机作为微网的主要功率支撑手段，在微网从并网向孤网过渡过程中，系统频率波动较大，且部分分布式电源有可能在低频保护动作下与电网隔离，不利于微网的稳定运行；增加储能设备后，储能设备对于微网的稳定运行可发挥重要的作用。

Switching Power Supply has three kinds of control circuits: Pulse Width Modulation, Pulse Frequency Modulation, Pulse Width and Frequency Modulation.

开关电源有三种控制方式：脉冲宽度调制、脉冲频率调制、脉冲宽度频率调制。

A full range of products to improve the system the company leading product coverage of low-frequency electric power, signal transmission and high-frequency data transmission cable, cable cover with hot categories, energy-saving electric appliances, wire and cable auxiliary equipment.

完善齐全的产品体系公司主导产品覆盖低频电力、信号传输和高频数据传输电缆，同时涵盖伴热电缆大类、节能电热电器、电线电缆辅助设备。

The power net is injected high frequency impulse signal online from voltage transformer connected to substation bus after the fault of single-phase grounding take place,and then the echo traveling wave from the fault spot corresponding to the high frequency impulse signal is captured by the fault detector installed in the substation.

配电网作为电力系统给用户供电的一个重要环节，它直接给用户提供高质量和可靠的电能，配电网在发生单相永久接地后，为防止发生多点接地短路故障，必须尽快确定故障线路及故障点到供电所的距离，这就是小电流接地电网故障定位问题。

Even more gratifying is that we have applied a combination of digital and analog technology, successfully developed an international leading level, the frequency can reach near 2MHZ, good repeatability, temperature coefficient of only 5 millionths per unit and can be long-term stability of the voltage frequency converter, which will enable new power meter can be achieved without long-term adjustment.

更可喜的是，我们已应用数字和模拟相结合的技术，成功研制出具有国际领先水平、频率可达近2MHZ，重复性好，温度系数仅每度百万分之五和能长期稳定的电压频率变换器，这将使新的电能表可做到长期不需调整。

A new control strategy based on repetitive control and digital PID control is presented in this paper, and a emulational model of a single-phase sine-wave variable frequency power supply which can be independentily variated by volt and/or frequency was designed for MATLAB/SIMULINK.

提出了一种基于重复控制和数字PID控制的新型控制策略，并在Matlab/Simulink软件环境下建立了独立调压、调频的单相正弦波变频电源的闭环控制系统的仿真模型。

Features of the TCM-03: Highly sensitive audio frequency amplifier Tuneable low frequency radio receiver Digital display meter Integral tone generator Isolated DC power output 详情请查阅www.baomi.com.cn

这些特点使之能够检测从微伏到伏特的所有类型的麦克风及其它窃听装置线路信号，包括直流与交流电源线和电话线。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷