任华

安科瑞电气股份有限公司  上海嘉定

  In modern chemical industry,  as a mechanical drag, electric motor become the foundation of all machinery. Improvement of science ａnd technology progress ａnd process control, especially the automation production requirements, make it urgent to develop ａnd improve the motor control ａnd protection equipment , so as to realize the function remote control, remote sensing, remote setting, fault diagnosis, ａnd centralized control of of the production process ａnd large machinery.

  At the same time, the chemical industry have the characteristics of large flux, full load continuous operation, has high requirements for electrical equipment reliability ａnd stability.Once there is an accident, the cause of the problem must been quickly checked ａnd problems must been promptly eliminate, in order to timely recover to produce.In the past ，thermal relay have been used for motor overload protection or use as control components, but limited by component quality ａnd technology, have been unable to meet the development of chemical industrial automation requirements, ａnd new type of intelligent motor protector, can meet the requirement of the protection of motor control. As a motor protection device, motor protector effectively guarantee the safe operation of the electric motor, replaced the thermal relay, By using advanced communication technology, has realized the motor control automation, ａnd take the significant economic benefits.

 

  YCGSI, a chemical company based in Yemen, contacted Acrel in late 2019 after its engineer searched online for the factory energy management system which can connected to SAP. Acrel is a high-tech enterprise integrating research ａnd development, production, sales ａnd service. It is committed to providing energy efficiency management ａnd power safety system solutions for power users. Acrel Electric has a complete production line from cloud platform software to components.The company was planning to develop factory energy management system.The customer visited the headquarters in shanghai at the end of December, ａnd after in-depth communication, they decided to start the purchase trial from the motor protector. So far, the customer has given satisfactory feedback, ａnd has planned to renew other products.

 

  Acrel ARD2F motor protector can protect motor in the process of starting timeout, overload, locked-rotor, imbalance, phase loss, underload, grounding/leakage, block, overvoltage, undervoltage, winding over temperature ａnd other condition. It realize the function of counting running time, frequency, monitor motor operating current, voltage, running time, starting time, alarm ａnd fault information. It also have the function of SOE failure event record, convenient for maintenance staff to find the causes.Through LCD liquid crystal display ａnd status indicators ａnd so on, running state of the motor is displayed clearly ａnd intuitively. The protector has RS485 remote communication port ａnd DC4-20mA analog output, which is convenient to form a network system with PLC, PC ａnd other control units, realize the monitoring of the motor in the human-machine interface, ａnd meet the needs of the chemical industry for the motor protector.

 

  When ARD2F intelligent motor protector is applied to the chemical industry, it brings the following operation effects to the automatic production process of chemical industry:

  （1）System information centralization

User can collect the parameters of each device node by means of meter reading, such as motor current, voltage, motor running status, electric energy, etc. According to these information, the user realizes real-time analysis ａnd processing of the motor running status of field equipment.

  （2）Intelligent control protection

When ARD2F intelligent motor protectors are used in the Chemical production process , if motors have the phenomenon such phase loss, over temperature, protector will timely s motor running, ａnd makes the corresponding instructions for a variety of fault information。The motor protector with anti-electricity shaking function, can be restarted when the power grid fault causes instantaneous ａnd large voltage fluctuation or the short-time power cut ａnd restored.

  （3）Fault recording facilitates field problem analysis

In the chemical industry, when electric motor falure occurs,  spare motor need to been timely replaced without affecting the operation mechanism.The motor pwith problem should be dealt with in time to ensure continuous production.The early treatment methods need a lot of manpower ａnd material resources ａnd need a certain amount of time to analyze, really not convenient.But ARD2F intelligent motor protector＇s powerful fault recording function saves maintenance personnel a lot of time, improves production efficiency ａnd system operation reliability.

 

 

  With the continuous development of modern control technology, the motor has become an important part of the control system, ａnd the motor protector is also developing in a diversified direction.Therefore, we should give full consideration to the actual needs of motor protection, judge motor faults in advance, accurately ａnd timely, rationally ｓelect protection functions ａnd protection modes, so as to realize good protection of the motor, improve the reliability of equipment operation, reduce unplanned shutdown ａnd reduce accident losses.Motor protector is an important component of power generation, power supply ａnd electricity consuption system. The widespread use of motor protector can not only improve the accuracy ａnd scientificity of process control, reduce the failure rate, but also play a positive role in promoting the automation level of electrical control system ａnd the development of national economy.