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very high impedance
相关语句
  很高的阻抗
     The PWM inverters that configure to each compensation winding are applied to produce fundamental currents,which are injected to the corresponding compensation windings. When the fundamental current compensation condition is satisfied,the series transformer can exhibit very low impedance to fundamental current and very high impedance to harmonic current,thus compel harmonic current to flow into passive filter circuit.
     每个补偿绕组配置一个逆变器,通过逆变器向相应的补偿绕组注入基波电流,当变压器原副边基波电流满足基波电流补偿条件时,串联变压器的一次侧对基波电流呈现很低的阻抗,而对谐波电流呈现很高的阻抗,从而迫使谐波电流流入无源滤波电路。
短句来源
  相似匹配句对
     The efficiency is very high.
     变换器的效率高等特征。
短句来源
     The measuring efficiency is very high.
     该测量系统的测量效率很高.
短句来源
     impedance plethysmography
     阻抗式测容积法
短句来源
     Improved Impedance Criterion
     一种改进的阻抗比判据
短句来源
     Transducer impedance matching
     换能器的阻抗匹配设计
短句来源
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  very high impedance
The trap load presents a very high impedance in the L1 band at the point in the antenna where the filter is placed.
      
The gates of the input buffers have very high impedance and could be sufficient to provide protection when VIN has overtaken VDD.
      
The mute input is very high impedance and is compatible with CMOS or TTL levels.
      
The analog inputs of the ADS807 are a very high impedance.
      
These standard grounding conductors have a very high impedance at frequencies grater than 10 MHz.
      
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Tradition methods for detecting single phase to ground faults in generator stator windings based on injecting signal have poor performance in high resistor grounding fault, because of the capacitance of generator stator windings. In order to improve it, an inductance, which parallels connection on the neutral grounding resistor at the second side of distribution transformer, is used to compensate the capacitance of generator stator windings. By selecting a suitable frequency of injection signal, the grounding...

Tradition methods for detecting single phase to ground faults in generator stator windings based on injecting signal have poor performance in high resistor grounding fault, because of the capacitance of generator stator windings. In order to improve it, an inductance, which parallels connection on the neutral grounding resistor at the second side of distribution transformer, is used to compensate the capacitance of generator stator windings. By selecting a suitable frequency of injection signal, the grounding fault protection can be realized by measuring the grounding resistance of fault point or injecting signal power factor. By simulation, it can detect very high impedance ground fault.

注入信号法发电机定子接地保护受定子绕组对地电容的影响 ,灵敏度较低 ,难以满足大型机组高灵敏度继电保护的要求。而采用外加小电抗器、选择合适的注入信号频率 ,以补偿定子绕组对地容抗、测量故障接地电阻或测量信号电压、信号电流相位差进行接地保护则可改善大型机组定子接地保护的灵敏度。计算、分析与仿真表明 :该方法具有较高的灵敏度。

A novel three phase large capacity series hybrid active power filter(APF) is presented.To increase the capacity of the active power filter,multiple compensation winding structure is adopted in secondary of the series transformer.The PWM inverters that configure to each compensation winding are applied to produce fundamental currents,which are injected to the corresponding compensation windings.When the fundamental current compensation condition is satisfied,the series transformer can exhibit very low impedance...

A novel three phase large capacity series hybrid active power filter(APF) is presented.To increase the capacity of the active power filter,multiple compensation winding structure is adopted in secondary of the series transformer.The PWM inverters that configure to each compensation winding are applied to produce fundamental currents,which are injected to the corresponding compensation windings.When the fundamental current compensation condition is satisfied,the series transformer can exhibit very low impedance to fundamental current and very high impedance to harmonic current,thus compel harmonic current to flow into passive filter circuit.A prototype with 100 kVA capacity is developed.Experimental results show the excellent filtering characteristic of the active power filter.

为了提高串联型有源电力滤波器的容量,提出串联变压器的二次侧多补偿绕组结构。每个补偿绕组配置一个逆变器,通过逆变器向相应的补偿绕组注入基波电流,当变压器原副边基波电流满足基波电流补偿条件时,串联变压器的一次侧对基波电流呈现很低的阻抗,而对谐波电流呈现很高的阻抗,从而迫使谐波电流流入无源滤波电路。研制了一套100 kVA的样机,实验结果证明此滤波器具有很好的滤波特性。

 
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