The definition and national standard of three-phase unbalance in power system were expatiated.
三相负荷不平衡以及系统元件三相参数不对称都会引起电力系统三相不平衡。
A new detection method for random harmonic current which was suitable for 3-wire and 3-phase unbalance system was put forward.
提出了一种适用于三相三线制不平衡系统的任意次谐波电流检测方法。
It is important to provide balancing compensation for shock load because of the severe voltage fluctuation and 3-phase unbalance imposed on power supply system by it.
冲击性负荷会引起供电系统严重的电压波动和三相不平衡，对其进行平衡化补偿具有重要的意义。
Based on this requirement, this paper introduced the theory of power quality monitoring, include RMS of voltage and current, power, three-phase unbalance, harmonic and flicker.
在此基础上研究了电能质量监测理论，详细介绍了电压电流有效值、功率、三相不平衡度、谐波和闪变的数字测量方法。
How to deal with three-phase unbalance compensation and how to filter the low-order harmonics, especially the2nd-order, are the two difficulties for reactive power compensation.
无功补偿的难点在于如何补偿三相不平衡以及如何有效地滤除低次谐波，尤其是2次谐波。
Several issues of power quality are presented, including harmonics, reactive power, three phase unbalance, large difference between peak load and vale load, voltage disturbance and so on.
第一章简单介绍了目前电网存在的几种问题，包括谐波问题、无功问题、三相不平衡问题、用电峰谷差过大的问题以及电压异常、断电问题等；
At present, our country power quality national standard was chiefly stipulated five quotas: frequency, harmonic and voltage deviation, three-phase unbalance and the voltage fluctuation and flicker.
目前我国电能质量国家标准主要规定了五个指标：频率、谐波、电压偏差、三相不平衡及电压波动与闪变。
Three unbalanced phase loads varies randomly to lead to three phases unbalance in middle and low voltage distribution system, whi ch brings a series of problems on power grid.
在中低压配电网中，三相负荷随机变化，产生三相不平衡，从而给电网带来了一系列的问题。
Three unbalanced phase loads varies randomly to lead to three phases unbalance in low voltage distribution system, which brings a series of problems on power grid.
在电网中，三相负荷随机变化，产生三相不平衡，从而给电网带来了一系列的问题。
Error analysis result shows that biased capacitor method can meet the need of measurement accuracy while the unbalance of three phase voltages is relatively small.
误差分析表明，偏置电容法在三相电压不平衡度较小时可以满足测量精度的要求。
A rotor unbalance experiment is carried out on a three phase squirrel cage induction motor.
在鼠笼式三相感应电机上用提出的方法进行了转子失衡的实验研究。
It has been proved in practice that the unbalance degree of the three-phase side current of this transformer can meet the requirements of the related regulations.
实践证明，这种变压器三相侧电流的不平衡程度可以满足有关规定。
On this basis, the influences to unbalance current of line tower type, wire parameters and phase sequence arrange are analyzed.
在此基础上分析线路塔型、导线参数、相序排列等因素对不平衡电流的影响。
The phase difference of mass unbalance and bend of rotor will affect the size of coupling zone and the coupling vibration in two coupling zones.
质量偏心与转子弯曲的相位差会影响耦合区的大小及耦合区内的耦合振动；
The theoretical conclusions are confirmed by detailed simulations under the situations, such as offsetting, unbalance, harmonic, phase-abrupt and frequency-abrupt.
并通过仿真研究，验证了三相输入信号存在直流偏移、不对称、谐波等干扰情况下，仿真结果与理论推导一致。
He's a very good player in the defensive phase, even though he has offensive characteristics and does not create any unbalance in the squad.
在防守上，他也很出色的，虽然他是一名进攻球员。他不会给球队带来丝毫的不平衡。
It covers five aspects: supply voltage tolerance, utility harmonic, three-phase voltage unbalance, power system frequency tolerance, voltage fluctuation and flicker.
它涵盖五个方面：供电电压允许偏差、公用电网谐波、三相电压不平衡度、电力系统频率允许偏差、电压允许波动和闪变。
Voltage unbalance of three phase ac distribution systems adversely affects power customers.
配电系统三相电压的不对称会对用户造成一系列不利影响。
Voltage unbalance of three phase ac distribution systems adversely affects power customers.
配电系统三相电压的不对称会对用户造成一系列不利影响。
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