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This text has analyzed the common malfunction of the asynchronous motor at first. And then it, which is based on symmetrical weight theory, has drawn accurate criterion of the trouble of the motor, confirmed the protective measures of different troubles. Finally, it has realized kinds of protection functions, such as short-circuit protection, rotate-stop protection, over-heat protection, negative current protection, zero current protection, low-voltage protection, over-voltage protection, overlong start-up time protection, frequent start-up protection, lock protection of electric leakage and so on.

本文首先分析了异步电动机的常见故障,以对称分量法为依据,采用检测过流幅值、负序电流、零序电流的方法,得出了电动机故障的准确判据,确定了各种故障的保护措施,对电动机实现了短路、堵转、过热、负序电流、零序电流、低电压、过电压、启动时间过长、频繁启动、漏电闭锁等保护功能。

At the begin of the dissertation, control strategy is analysed for improving performances of the interver in dynamic, steady-state and minishing harmonious component of the output voltage. Firstly, the theory of the voltage differential multiloop feedback strategy is analysed .

着重于对逆变电源控制策略的研究,从控制策略的角度入手改善逆变电源的输出动态性能,提高逆变电源的稳态精度,同时改善输出电压的正弦度,减少输出电压的谐波含量。

Then a lot of simulation and comparision reaserch validate the excellent performances of the interver in dynamic, steady-state and minishing harmonious component of the output voltage.

文章从分析电压微分多闭环控制策略的理论基础入手,通过大量的仿真比较验证了该控制策略在改善逆变电源动态和稳态性能以及抑制输出电压谐波方面良好的性能。

In this dissertation, we demonstrated a low voltage, fast speed and good data retention MONOS memory device with high work function IrOx metal gate, novel high-k AlN trapping layer and HfAlO blocking layer.

高介电系数介电质的使用,不仅可以有效降低操作电压,同时也可以将电压有效的跨在薄二氧化矽穿遂层以增加编码和抹写速度。

Transmission voltage banks8 are generally connected grounded wyes to lessen the recovery voltage requirements on the capacitor switch or breaker.

输电电压等级的电容器组通常联接成接地Y形以减轻在电容器开关或断路器上恢复电压的要求。

The most common measuring and testing instruments are voltage testers, voltmeter, ammeter, ohmmeters, continuity testers, megohmmeters, wattmeters, and watt-hour meters.

最常用的测量和检验仪器有电压测试仪,电压表,电流表,欧姆表,短路测试仪,兆欧表,功率表和电度表。

Such meters as we use to measure voltage are called voltmeters.

像我们用来测量电压的这种仪表就称为电压表。

WS336-5.0 are useful as a precision 5.0V low voltage reference for digital voltmeters, power supplies or op amp circuitry.

WS336 - 5.0是有用的作为精确5.0V数字电压表,电源供应器或运算放大器电路的低电压基准。

AC Voltmeters above 600V Volts require a basic 150V meter combined with an extemal PT.

600V以上的交流电压表需要一个150V基本表,配外置电压互感器。

Based on the characteristics of varistor, the influence of the different impedance values between the protective devices is discussed.

结合浪涌保护器的电压—电流特性,利用推导出的公式研究由压敏电阻组成的多级保护系统,分析两保护器之间的阻抗变化对暂态过电压在两级保护器上分配的影响。

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The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作:对伸臂位于顶部的单层框架—筒体模型进行分析,提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。

Its advantage is that it can be used in smaller units.

其优点在于可以在较小的单位中应用。