欠电压

线路和设备的欠电压与保护

Undervoltage on Line and Equipment and Their Protection

欠电压脱扣器在万能式断路器上是十分常见的一件电压保护装置，该装置的失效直接影响到断路器的正常运行。

An undervoltage tripper is a very popular electrical protection device for universal breaker , which will directly affect the normal operation of a breaker if it breaks down .

保护电路利用采集到电气信号对整个系统实施保护，包括过电流、过电压、欠电压、IPM模块过热等。

The protective circuit safeguard the system against high current , high voltage , low voltage and high temperature on the IPM model .

应用于220V工频交流电路中，对过电压、欠电压、强电和雷电干扰、触电、漏电和电线短路失火等事故均有良好的防护作用。

When it is used in the 220 V circuit with an industrial frequency alternating current , it can give good protection against overvoltage , under voltage , interference of strong current , thunder and lightning , electric shock , electric leakage , electric wire fire and circuit fire .

电池欠电压监测电路的设计

Design of monitoring circuit of battery for showing deficient voltage

欠电压（电压降低）。低压开关模装置可保护模具的安全。

Undervoltage ( Voltage Drop ) . Low pressure mold closing is standard .

欠电压（电压降低）。超大规模集成芯片中低压差稳压电路的改进

Undervoltage ( Voltage Drop ) . Modification of Low Dropout Regulator in VLSI Chip

自复式全自动过电压、欠电压保护器

Self-recovery Full Automatic Over and Behind Voltage Protector

活塞式欠电压继电器

Plunger type undervoltage relay

此外，系统硬件电路具有电池过电压、欠电压保护及均衡等功能，可对单体电池进行监控并实施必要的保护。

The system has the battery over voltage / under-voltage hardware protect functions , and the function of cell voltage balancing .

门锁单元包括：读写器模块、nRF905射频通信模块、电机驱动模块、欠电压指示模块。

The lock unit included : reader-writer module 、 nRF905RF communication module % motor drive module % owe voltage indicating module .

并对变频器进行过电流、过电压、欠电压、缺相、漏电等试验。

And the frequency converter for over electric current , over voltage and low voltage , phase lack , leakage current test .

自动保护功能：具有过载、短路、高水温、低油压、欠电压、油高温、超速保护、自动跳闸、停机功能；

Automatic Protection : overload , short circuit , high temperature , low oil pressure , under voltage , oil temperature , overspeed protection , auto trip , stop function ;

针对焊接过程中可能出现的过/欠电压、过电流、过热等故障，设计了相应的保护电路和报警电路。

Aiming at the possible problems occuring in the welding process , such as over / lower voltage , over-current , over-heat , a corresponding protecting and alarm circuit is designed .

同时，为保证安全可靠运行，系统还具备了输出过电流、输入欠电压、过热等自我保护功能。

Meanwhile , to ensure the safe and reliable operation , an output over-current , input under-voltage , over heating and other self protection function is also contained in the system .

老矿井采区供电电压不稳常会造成设备起动困难甚至不能起动，有时还会发生运行中的设备启动装置欠电压跳闸，严重威胁矿井安全。

If the supply voltage is unstable at the working face of an old coal mine , it can make equipment difficult to start and can cause operating equipment to trip due to undertension .

结合某型发射装置产品，详细论述了军用装备在耐电压尖峰、耐过电压浪涌、耐欠电压浪涌以及耐瞬时断电等方面的设计原则和方法。

By the design of a launcher product , the design principles and methods of military equipment on voltage ripple resistance , over voltage surge , under voltage surge and power transient break are given .

较为详细的介绍了一种电池欠电压保护电路的设计原理及电路的构成，实践应用表明，此电路可很好的实现电池欠电压保护报警。

The design principle and structure of a monitoring circuit of battery for showing deficient voltage is introduced in this paper . As showing by practice , it can perfectly realize to give an alarm when the battery is in condition of deficient voltage .

随着大功率冲击性负荷在矿井中的大量使用，对矿井电网造成的无功冲击和高次谐波污染等危害不仅危及电网安全，同时造成过电流、欠电压等现象的发生，影响了矿井生产。

With the use of high-power and impact elasticity load in coal mine , reactive impact and high harmonics are happened in mine power grid , which endanger the security of power grids and cause over-current , voltage at the same time , and effect on mine production .

分析了准谐振模式变换器中的欠电流、过电压、过载保护等功能、动态自供电（DSS）、准谐振工作、跳跃周期工作原理。

Under current , over voltage , overload protection function , DSS , quasi-resonant mode , jitter period principal were all analyzed .

实现直流系统过、欠压保护及电压显示的组合，装置的集成度非常高。

DC system had to achieve , under-voltage protection and voltage show a combination of device integration is very high .

在为电子控制器供电的航空直流电源中存在欠压和瞬态电压（包括浪涌电压和尖峰电压），同时存在严重的电磁干扰问题。

Usually , there are under-voltage and transients in avionics dc power supply for electronic Controller , also EMI is included .

该文在以前研究的基础上，对欠压约束模型中影响电力电容器欠压保护动作电压的另一个重要参数动作参考比较电压进行了理论分析，为问题的解决提供了新的有效途径。

An effectual method has been obtained through analyzing the other one important parameter ( operation reference voltage ) that affects the capacitor under-voltage protection operation in under-voltage bound model on reference [ 1 ] .