无功的

The following functions can be realized: Measuerment:the effective values of three phase current and voltage, power frequency, active power, reactive power, power factor etc. Motor control: direct starting, converse starting, star and triangle starting, self-starting. Protection:thermal overload protection, current leakage protection, open-phase protection, three-phase unbalance protection, over voltage protection, loss voltage protection, low load protection and fault warning and fault dates memory. Communication: communication of the computer in control room and the microcomputer monitor in the spots is realized by the interface of RS-485. The motor is not only controlled in the spots but also in control room. The dates, information and some functions are shared by the spots and control room too.

该电动机监控器以80C196KC单片机为核心，通过采样三相电流﹑电压信号来实现以下功能：三相电流﹑电压有效值，电网频率，有功功率，无功功率及功率因数等的测量；对电动机实现直接、正反转、星三角及自起动控制；对电动机实现热过载、漏电、断相、三相不平衡、过压、欠压及轻载保护，对故障进行报警及数据记忆；通过RS-485串行接口与中央控制室计算机实现通信功能，对电动机既可本地，也可远程控制；实现控制现场与控制室之间数据、信息、功能共享。

This, in turn, causes second harmonic pulsations in the torque and reactive power.

这反过来又造成二次谐波脉动的转矩和无功。

Application of pseudo- parallel genetic algorithm in reactive power optimization .

伪并行遗传算法在无功优化中的应用。

Static Phase Generator is a kind of equipment of in-place compensating reactive power, which technically designed for large and medium-sized wire-wound type electromotor to save energy and reduce wastage.

静止式进相器是专为大中型绕线式电机节能降耗设计的无功功率就地补偿装置。

Reactive power compensation is an effective method to reduce the loss of power grid and raise the efficiency of transmission.

无功补偿是降低电网损耗，提高配电效率的有效手段。

And base on topological structure of SVG for three-phase three-wire system, it puts forward a control method of compensation current which is based on forecasting current strategy to improve the tracking accuracy of dictation current.

同时，在三相三线制电压型静止无功发生器拓扑结构的基础上，论证了两种直接电流控制方法：滞环控制和三角波控制。

Three-phase three-line shunt Active Power Filter can be used to restrain harmonic currents and compensate reactive power current on-line.

三相三线并联有源电力滤波器能够实时的补偿谐波电流和无功电流。

Its main content including following several aspects: First, carry on the load computation according to the need coefficient method, and selects the method which the low-tension side centralism compensates to carry on the idle work compensation.

其主要内容包括以下几个方面：首先，按需要系数法进行负荷计算，并采用低压侧集中补偿的方式进行无功补偿。

The regulator is used for real-time control of the dynamic reactive power compensation of an arc furnace.

该调节器将用于电弧炉动态无功补偿的实时控制。

This system can use another interesting feature of a SMES: its ability to inject reactive power to control the connection bus voltage (this characteristic depends on the eolic generator used).

这种系统还可利用SMES另一令人感兴趣的特点：有能力发出无功来控制所联接母线电压。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。