低电压保护

SEL-749M低电压保护误动作的分析与改进

Analysis and improvement of SEL-749M low voltage protection malfunction

同步电机的稳定界限和低电压保护装置

Margin of Stability and Low Voltage Protection Device of Synchronous Motor

我国的电动机低电压保护一直采用定时限特性。

Low voltage protection devices in China have characters of fixed time-lag .

因此，作为失步保护后备的低电压保护也应具有反时限特性。

Thus , low voltage protection devices , served as lock-out protection reserve will also have characters uf inverse time-lag .

对我公司高压电机的低电压保护现状进行分析，指出存在的问题，并提出改进意见。

The article gives the analysis about the present low-voltage protection of high-voltage motor , sets forth the existing problems and brings out the proposal for improvement .

本装置配有过流保护、负序电流保护、零序电路保护、起动时间过长保护、低电压保护。

Over current protection , negative current protection , zero sequence current protection , over time of start protection and low voltage protection is configured in the device .

在电力系统电压严重降低或电源短时小断时，往往引起低电压保护动作而甩负荷。

When voltage is very low or power supply has been broken off , it will result in action of low voltage protection device so as to remove load .

通过仿真计算，研究了双馈风电机组低电压保护动作时间对机组本身和风电场运行的影响及直流环节电容容量对限制过电压的影响。

The LVRT control principle , control model and control strategy of DFIG and D-PMSG are investigated . ( 4 ) The action time of the rotor crowbar and the dc-link capacitance capacity of DFIG are studied .

并指出了该系统在运行维护中需要注意的重点，包括蓄电池的正确维护，合断开关的正确顺序，摘除变频器的低电压保护。

The main points need to be paid attention in the system running and maintenance were pointed out including the correct maintenance of the storage battery , the correct opening and closing order , the removing of the frequency converter low voltage protection .

接地故障的低电压系统的保护是因为存在和电弧接地故障的低级别的性质相当严重的问题。

Ground-fault protection of low-voltage systems is a considerable problem because of the presence and nature of low-level arcing ground faults .

对于较低电压等级线路保护可采用测控、保护、合并单元、智能终端一体化线路保护装置。

Lower voltage level line protection can be monitoring and control , protection , merged cells , intelligent terminal integrated circuit protection device .

本文提出了在系统芯片（SOC）中加入电源管理模块，用动态方法对外部电源进行管理的设计思想，达到稳定供电，低电压检测，以及保护随机存储器（RAM）内容等目的。

Accordingly , a scheme is proposed to integrate a power resource management module into SOC to manage the external power resource dynamically as to supply SOC chip with stable power , detect the low voltage and protect the data in RAM from losing .

通过目前调速装置发展过程中提出的新的硬件要求，在控制电路、3.3V低电压供电电路、保护电路、外部给定控制电路等硬件设计部分给出了优化实现方案。

According to the new hardware requirement , this paper provides parts of ways to finish the functions , such as 3.3v power supply circuit protection circuit external analog input circuit and so on .

同时由于低电压信号下对保护傅立叶算法精度要求更高，提出滚动傅立叶算法，提高滤波算法抑制衰减非周期分量能力。

Under the low-voltage signal condition , protection 's requisition for precision of Fourier algorithm will be higher , propose roll Fourier algorithm , improve filter algorithm 's ability to suppress the decaying non - periodic component .

低电压电路（即使它们是低电压）必须和保护地连接，这样危险电压才能被检测出来。

The low voltage circuit ( even with low voltage on it ) shall also be connected with protective earth , thus the dangerous voltage can be detected .