MVAA14B1AA0785C ALSTHOM 开关量输入模块 适用于传动控制单元

MVAA14B1AA0785C ALSTHOM 开关量输入模块 适用于传动控制单元

描述

●低负荷保护继电器

●110-125伏交流电

●50/60HZ

●地球断层

●即时项目

保护重要电动机的自启动

当电动机的供电母线电压短时降低或中断又恢复时,为防止线路上电动机同时自启动使电源电压严重降低,通常会在次要电动机上装设低电压保护。

当供电母线电压低到-定值时,低电压保护动作,将次要电动机切除,使供电母线电压恢复到足够的电压,以保证重要电动机的自启动。

保证技术安全及工艺过程的特点

在某些情况下,当电压长期消失时(如10S左右)根据技术安全的条件及生产工艺过程的特点,需将某些电动机切除。因为在这段时间内锅炉已熄灭，自启动已经没有必要了。为了保证I艺联锁动作,应装设低电压保护动作于跳闸。另外,还有一些带恒定阻力矩机械的电动机,如磨煤机等,在电压降低时不可能自启动,这些电动机也应在电压降低时切除。

MVAA14B1AA0785C ALSTHOM 开关量输入模块 适用于传动控制单元

Description

● Low load protection relay

●110-125 volts AC

●50/60HZ

● Earth Faults

● Instant project

Protect the self-starting of important motors

When the power supply bus voltage of the motor is reduced for a short time or interrupted and restored, in order to prevent the motor on the line from starting at the same time to seriously reduce the power supply voltage, low voltage protection is usually installed on the secondary motor.

When the power supply bus voltage is low to a fixed value, the low voltage protection action will cut out the secondary motor, so that the power supply bus voltage is restored to sufficient voltage to ensure the self-starting of the important motor.

Ensure technical safety and process characteristics

In some cases, when the voltage disappears for a long time (such as about 10S), some motors need to be cut out according to the technical safety conditions and the characteristics of the production process. Since the boiler has been extinguished during this time, self-starting is no longer necessary. In order to ensure the interlocking action, a low voltage protection action should be installed at tripping. In addition, there are some motors with constant resistance moment machinery, such as coal mills, etc., which cannot be self-started when the voltage is reduced, and these motors should also be cut when the voltage is reduced.