Used for points and load current, closed loop current, no-load transformer and cable charging electric current. 用于分合负荷电流、闭环电流、空载变压器和电缆充电电流。
Its main transformer is made of imported cold rolled silicon steel, So its power loss is little with low no-load current. 该系列点焊机,主变压器均为进口冷轨硅钢片,因此,主变压器功耗小,各型空载电流小。
This article discusses the differential protection malfunction of transformers with no-load Input caused by, analyzes the emergence, hazards and characteristics of excitation inrush current. 论述了变压器空载投入时差动保护误动作原因是由励磁涌流引起的,分析了励磁涌流的产生、危害及其特点。
The average of the line currents at rated voltage is the no-load current. 额定电压下线路电流的平均值即是空载电流。
The principle of reducing the no-load loss, no-load current and noise of five-step laminated core is analysed. The analytical result shows that the structure adopted five step laminated core can improve no-load performance obviously. 分析了五级接缝铁心降低空载损耗、空载电流及噪声的机理,指出铁心采用五级接缝铁心结构能够大幅度提高变压器的空载性能。
This paper puts forward the request of TIG welding power, including external characteristic of no-load voltage, adjustment characteristic and duty cycle, also it relates the technology parameters of TIG welding power, namely the choice of current type; 提出了TIG焊电源的要求,即空载电压、电源外特性、调节特性、负载持续率。同时也讲述了TIG焊电源的工艺参数,即电流种类的选择;
Through the simulation of energization of no-load transformer in different case, we have discussed the factors influencing the characteristics of inrush current. 本文通过对变压器空载合闸过程的仿真研究,对在不同系统运行参数及铁心材料特性参数下励磁涌流特征量变化的规律进行了探讨。
It is pointed out that the influence of no-load voltage on core vibration and the influence of loading current on winding vibration ought to be considered, especially, for the situation of remarkably undulatory net-voltage. 提出了电网电压波动较大时必须考虑空载电压大小对铁心振动的影响,评价绕组的振动水平时必须考虑负载电流的大小.研究内容对于振动信号分析法的推广应用具有重要意义。
By calculating no-load compensation current, weight compensation current, accumulator tension compensation current, dynamic torque compensation current, the total torque compensation current is gotten. 论文分别对空载补偿电流、带钢重量补偿电流、活套张力电流、活套力矩动态补偿电流计算,得到前后活套转矩电机总的张力补偿电流;
It can be used as an independent relay, including crossing current brake circuit, no braking quick-break circuit, preventing no-load starting transformer inrush current, and avoiding fifth harmonics of overexcitation running for high-power transformer. 它可以作单个继电器用,具有穿越电流制动回路,无制动速断回路,且可防止空投变压器励磁涌流的影响,对大容量变压器还可躲开过励磁运行时五次谐波的影响;
The testing results and the calculating results of the perameters such as no-load loss, no-load current and short-circuit impedance of several 240MVA/ 220kV double-winding step-up transformers are compared and analyzed. The experienced coefficients of the parameters are given. 对几台240MVA/220kV双绕组升压变压器的空载损耗、空载电流和短路阻抗这几个重要参数的试验数据和设计计算值进行了比较与分析,得出了这些参数的一些经验系数。
The Example and the Analyzing for Cause of Variation in No-load Current of Motors 电动机空载电流变化的原因及实例分析
Effect of power supply frequency to the welding transformer in the main circuit has been analyzed, and, through lab testing, appropriate series capacitance has been selected, which effectively reduce power voltage and no-load current of the transformer. 并针对斩波电路中工频分量对焊接变压器正常工作的影响进行了分析,通过试验选取合适的串联电容,有效的降低了变压器两端的工频电压及空载电流。
It makes finite element analysis for no-load motor, full-load motor and armature magnetic field singly acting motor, and it gets distributing map of magnetic field and static characteristics curve as different rotor angle and different armature current in a permanent magnet circle for the motor. 分别对电机空载、负载以及电枢磁场单独作用3种情况下进行了有限元分析,得出在1个永磁磁链周期内不同转子位置角和不同电枢电流作用下的磁场分布图以及静态参数特性曲线。
In the no-load test of transformer, because of the low power factor and non-sinusoid current waveform, the high precision measurement is difficult. 变压器的空载试验中,由于功率因数低,空载电流不是正弦信号,高精度测量其有功功率具有一定的难度。
The first harmonic winding and harmonic winding no-load property curve are gained when field current is change. 通过改变励磁电流的大小,得到了基波绕组和三次谐波绕组的空载特性曲线。
In the process of transformers no-load closing or voltage recovery after the remove of external fault, inrush current will be produced whose amplitude may reach several times even nearly ten times of the rated current. 变压器空载合闸或外部故障切除电压恢复的过程中,会产生幅值可达变压器额定电流的几倍甚至近十倍的励磁涌流。
Using the unit generator Field-circuit Coupled Time-Stepping Finite Element Model, the open-circuit of generator terminal ends as well as the stator three-phase sudden short circuit process are simulated. The no-load voltage curves, and the short-circuit current dynamic curves of stator windings and field winding are gotten. 利用该单元电机场路耦合时步有限元模型,对发电机机端开路、三相突然短路过程进行了仿真计算,得到了发电机空载电压曲线以及定转子绕组的短路电流动态响应曲线。
Magnetic flux was larger with no-load switching and it produced several times field current with short time to return to normal. 仿真过程中空载合闸时磁通较大,产生几倍的励磁电流并短时间恢复正常,是一种正常工作状态。
The paper establishes the transformer numerical simulation and dynamic model to simulate the power transformer no-load closing and records the voltage and current data. 建立变压器数字仿真和动模仿真模型,仿真了电力变压器的空载合闸,并记录了电压、电流数据。
In the simulation, the models in three kinds of condition including no-load, applying torque current and applying force current were solved, and the magnetic flux density was imported and plotted in the post-processing. 在仿真部分,本文主要对空载、施加转矩电流和施加牵引力电流三种情况进行了求解,并在后处理中导出了三种情况下的磁通密度。
System debugging process, no-load current experiments, no-load constant velocity tests and loading experiments are included. And the phenomenon are analyzed and discussed. 最后,本文利用设计的电路和软件进行了一定的电机驱动实验,主要包括系统调试过程、空载电流实验、空载恒定速度实验以及加载实验等,并就出现的现象进行了分析与讨论。
As a result of core saturation during no-load closing, inrush current happened in the winding whose amplitude is several times of rated current has a tremendous impact on equipment safety and protection actuating. 在其空载合闸时可能会因铁心的饱和,绕组内出现额定电流若干倍大小的励磁涌流,对系统运行、设备安全和保护动作都会产生极大的影响。