电机保护器的选型
Type selection of motor protector
一、 选型基本原则 目前，市场上电机保护产品未有统一标准，型号规格五花八门。制造厂商为了满足用户不同的使用需求派生出很多的系列产品，种类繁多，给广大用户选型带来诸多不便；用户在选型时应充分考虑电机保护实际需求，合理选择保护功能和保护方式，才能达到良好的保护效果，达到提高设备运行可靠性，减少非计划停车，减少事故损失的目的。
First, the basic principles of selection. At present, there are no uniform standards for motor protection products in the market, and there are various models and specifications. In order to meet the users' different needs, the manufacturers derive a lot of series of products. There are many kinds of products, which bring a lot of inconvenience to the selection of the users. In the selection of the users, the actual needs of the motor protection should be taken into full consideration, the protection function and the protection mode are reasonably selected to achieve good protection effect and improve the equipment. Operational reliability, reducing unplanned parking and reducing accident losses.
二、选型的基本方法
Two, the basic method of selection
(一）与选型有关的条件
(1) conditions related to selection
1、电机参数：要先了解电机的规格型号、功能特性、防护型式、额定电压、额定电流、额定功率、电源频率、绝缘等级等。这些内容基本能给用户正确选择保护器提供了参考依据。
1, motor parameters: first to understand the specifications of the motor, functional characteristics, protection type, rated voltage, rated current, rated power, power frequency, insulation grade and so on. These contents provide a reference for users to correctly select protectors.
2、环境条件：主要指常温、高温、高寒、腐蚀度、震动度、风沙、海拔、电磁污染等。
2, environmental conditions: mainly refers to ambient temperature, high temperature, high cold, corrosion degree, vibration degree, wind and sand, altitude, electromagnetic pollution and so on.
3、电机用途：主要指拖动机械设备要求特点，如风机、水泵、空压机、车床、油田抽油机等不同负载机械特性。
3, motor uses: mainly refers to the characteristics of the drive mechanical equipment requirements, such as fans, pumps, air compressors, lathes, oil field pumping units and other different load mechanical characteristics.
4、控制方式：控制模式有手动、自动、就地控制、远程控制、单机独立运行、生产线集中控制等情况。启动方式有直接、降压、星角、频敏变阻器、变频器、软起动等。
4, control mode: control mode has manual, automatic, on-site control, remote control, independent operation of single machine, centralized control of production line and so on. The starting way is direct, step-down, star angle, frequency sensitive rheostat, frequency converter and soft start.
5、其他方面：用户对现场生产监护管理情况，非正常性的停机对生产影响的严重程度等。与保护器的选用相关的因素还有很多，如安装位置、电源情况、配电系统情况等；还要考虑是对新购电机配置保护，还是对电机保护升级，还是对事故电机保护的完善等；还要考虑电机保护方式改变的难度和对生产影响程度；需根据现场实际工作条件综合考虑保护器的选型和调整。
5, other aspects: users' on-site management, abnormal shutdown and the severity of production. There are many factors related to the selection of the protector, such as installation position, power supply, distribution system and so on. It is also necessary to consider the protection of the newly purchased motor, the upgrading of the motor protection, the improvement of the protection of the accident motor, and the difficulty of the change of the motor protection mode and the degree of influence on the production. The selection and adjustment of protectors should be considered comprehensively according to the actual working conditions.