查询词典 fault current

It simulates the circuit breaker with a zero impedance branch, and adopts the linear network characteristic and theory, variable structure and variable parameter analyses to transfer the short-circuit current flow in the bus-bar equality into each side of circuit breaker, and deduces the sequence component model and algorithm for calculating the short-circuit current of circuit breaker when the short-circuit fault occu...

该方法将断路器作为一条阻抗为零的支路来模拟，运用线性网络特性、定理及变结构与变参数的分析方法，将母线上短路时的短路电流等值转移到断路器两侧，导出了相当于在断路器两侧分别发生短路故障时，流过断路器的短路电流的序分量模型和算法。

A saturated core high temperature superconducting fault current limiter is an ideal current limiting device.

饱和铁芯型高温超导故障电流限制器就是一种可以实现上述功能的理想装置。

The methods to calculate the differential current of fault phase and sound phase were discussed. The proposed method can eliminate the influence of capacitor current. The sensitivity and security can be realized.

在区外故障或者是区内串补安装点故障情况下，理论上新算法完全不受电容电流的影响，实现了差动保护安全性和灵敏性的统一。

The main contents of this thesis are:(1) The new phase segregated current differential protection based on distributed parameter is proposed. The new protection can calculate the current at the fault point in real time, so its performance is hardly affected by distributed capacitance of transmission line.

本论文主要内容包括以下几个方面：(1)提出了基于分布参数的分相电流差动保护新原理，该原理本质在于实时计算线路的故障点电流，因此其性能基本不受分布电容的影响。

The result of simulation shows that it is effective for the accurate discrimination of magnetizing inrush current and internal fault current.

仿真测试结果验证了该方案是切实可行的，能够准确识别各种变压器状态下的励磁涌流和故障电流。

Transformer; magnetizing inrush current; fault current; BP neural network; RBF network

变压器；励磁涌流；故障电流； BP神经网络； RBF神经网络

This thesis chooses B spline wavelet that adapts to the analysis of power system signal, and uses the wavelet transformer to analyze the magnetizing inrush current and inner fault current.

而小波变换具有多尺度分析和良好时频域局部化分析特性，适合提取信号边缘和峰值突变的特征，能够很好的检测信号奇异性。

The waveform of differential current in each data window is divided into four parts averagely according to time, and the area-ratio among the four parts can be used to distinguish magnetizing inrush from internal fault current.

该算法以工频一周波为数据窗长，将数据窗内的差流波形按时间均分为4份，根据各份面积之间的比值来识别励磁涌流和内部故障电流。

This control system includes main control model, current detection, position sensing, fault detection and protection, serial interface. Anisomerous bridge topology structure is adopted to design the power converters and driver circuit. Double closed loop based on velocity and current is adopted to control AC-motor.

其控制电路主要包括主控模块、电流检测模块、位置传感器模块、串口电路、故障检测和保护电路等；采用不对称桥式扑结构设计了功率变换器及其驱动电路模块；采用速度和电流双闭环的形式，完成对交流电机的控制。

This product is applicable to coal mine where has explosible dangerous gas and coal dust,It is used for controlling direct starting stop and reversion of three-phase squierrel cage type asynchronous motor whose rated current up to 400A in system of AC50Hz rated voltage 1140V or 660V, Meanwhile it protects the electromotor and relative circuit, The starter can be combined with firedamp sensor and used to test the consistency of mining working area,the starter will trip when it exceed the limit ;adopt intrinsic safety type circuit for the control circuit; possess the function of local control and remote control by single set and multi sets procedure control; display working voltage current and gas consistency can remember fault parameter

该产品适用于具有爆炸性危险气体和煤尘的矿井中，在交流50Hz，额定电压为1140V或660V ，控制额定电流只400A的三相鼠笼式异步电动机的直接起动，停止及反转，同时对电动机及有关电路进行保护，起动器可与甲烷传感器相连接用于检测才掘工作面的甲烷浓度，当其超限时起动器跳闸；控制电路采用本安型电路；具备单台就地控制与远方控制及多台程序控制功能，能显示工作电压、电流、瓦斯浓度，并能记忆故障参数。

There are different types of personal loans available.

有许多不同类型的个人贷款优惠。

The above mentioned teaching model of spiral rising can be used to avoid rigidness in teaching.

上述螺旋式上升的教学模式，可以避免教学形成模式後的僵化现象。