Unbalanced throe phase currents widely exist in rural electric network and low-voltage power supply for urban buildings. 在农网或城网民用低压供电系统中,三相间不平衡电流普遍存在。
The unbalanced degrees of current in primary winding under different load conditions are discussed, which are based on the general expressions of negative phase sequence current. 结合负序电流的通用表达式,讨论了在不同负荷条件下的原边电流不平衡度。
The out-of-order fluxion of teachers and the unbalance of the qualified teachers cause the unbalanced development of the teachers of compulsory education. Circuit-level Parallel Strategies of Three Phase PWM Converters without Zero Sequence Circulating Current 当前义务教育师资的无序流动和师资质量的良莠不齐导致义务教育师资的非均衡发展。无零序环流三相PWM变流器线路级并联策略
Using unbalanced magnetron sputtering method, smooth, dense and uniform diamond like carbon films ( DLC) with high diamond phase content are deposited. 利用非平衡磁控溅射物理气相沉积技术制备了光滑、致密、均匀的类金刚石薄膜。
Unbalanced control based on individual phase for static synchronous compensator 静止同步补偿器的分相不对称控制
In serious unbalanced operating conditions, the obvious difference in amplitude among the compensation currents in three phases may lead to one or two phase overloading and the compensation capability is restricted. 在负荷严重不平衡的情况下,补偿装置三相分担的负荷不均衡会限制装置的补偿能力,也容易导致一相或两相过流。
The algorithm of the designed digital linear phase bandpass filter and DFT demodulation are successfully applied to the unbalanced amplitude and phase demodulation of the textile cup and carding roller dynamic balance machine. 设计了数字线性相位带通滤波及DFT解调算法,并成功地将其应用于纺杯分梳辊动平衡机不平衡量幅度及相位解调中。
A new method to calculate apparent power in unbalanced three phase system 一种计算三相不对称系统视在功率的新方法&BG法
According to the dynamic balance velocity detected, the amplitude and phase of the vibration signal relative to the unbalanced magnitude of the wheels were obtained through the amplitude and phase frequency spectrum. 根据测定的车轮动平衡转速,由频谱分析求解出与车轮不平衡量有关的振动信号的振幅和相位。
Unbalanced fault calculation based on three phase bus impedance matrix 基于三相导纳阵的不对称故障计算
The system has picked up unbalanced ( fundamental frequency) signal amplitude and phase accurately by adopting the fourth order band-pass following filter controlled by phase-lock loop and FFT. 系统设计中采用锁相环控制的四阶带通跟踪滤波、FFT实现了不平衡(基频)信号幅值和相位的精确提取。
Shunt capacitor unbalanced current protection fails to identify the faulted phase and three-phase balanced failures and causes misoperation when failures exist in two or three phases simultaneously. 不平衡电流保护不能够识别故障相、不能够对三相平衡故障保护以及在多相同时发生故障时会发生误操作。
Synchrotron Radiation and Measurement Analysis of the unbalanced sidebands of phase modulation 同步辐射与分析测试相位调制边带失衡问题研究
The design of negative sequence protection is mainly introduced with seriously unbalanced power supply voltage fault, open phase fault and two-phase short circuit fault. 从电源电压严重不平衡故障、断相故障和两相短路故障三方面介绍了负序保护方案设计;
Symmetrical reactive power compensation for unbalanced three phase load 三相不对称负荷的无功功率对称化补偿
Analysis of the unbalanced sidebands of phase modulation 相位调制边带失衡问题研究
The optimum compensation voltage is presented by rotating three unbalanced voltage phase diagrams and using symmetrical component method. 通过对不对称三相电压相量的旋转和对称分量法来确定DVR的最优输出电压。
Using this approach, the unbalanced three phase load can be transferred into a balanced to source one and the power factor can be corrected to any desired value. 当三相负荷不对称且功率因数低时,采用这种补偿方法不但可将功率因数补偿到任意指定值,而且可将原来的三相不对称负荷补偿成对于供电电源来说是三相对称的。
By applying the theory of dissipative structure, this paper researches the temporal series and the spatial structure of the reversion process of desertification, and discusses the fluctuations, formation of the dissipative structure, and unbalanced phase change in the reversion process of desertification. 用耗散结构理论探讨了沙漠化逆转过程的时间序列和空间结构,论述了沙漠化逆转过程中的涨落现象、耗散结构的形成及非平衡相变的发生。
Unbalanced three phases, reactive and harmonics are the characteristics of traction power supply system because of single phase AC load. 牵引负荷为变化频繁的单相交流负荷,使电气化铁道牵引供电系统三相严重不平衡,并且存在无功和谐波电流。
In unbalanced three-phase system, when using d-q calculating mode based harmonic current detecting method, there is a systematic error between the detected result and actual current arising by the phase difference of phase locking result and positive voltage component. 在三相不对称情况下用d-q运算方式谐波检测方法检测电网谐波时,锁相环的锁相结果与电压正序分量之间的相差使检测结果存在系统误差。
A novel traction power supply system with the active power compensator as its key part is proposed as a solution for unbalanced 3 phase load, low power factor and harmonic pollution, etc. 提出了一种以有源功率补偿器为核心的新型铁路牵引供电系统,以解决现有牵引供电系统对电力系统造成的三相负载不平衡、功率因数低及谐波污染等问题。
These loads, which bring fluctuation of system voltage, unbalanced three phase voltage to the power system; affect the normal operation of other electrical equipment and economics of electricity; make the power quality problems more serious. 由此造成了系统电压波动,电压三相不平衡,影响了其他用电设备的正常运转和用电的经济性,使得电能质量问题日益严重。