Basic method for motor protector model selection
According to years of experience in motor protector sales, the following methods for motor protector selection are summarized for reference by users.
First, the basic principle of motor protector selection
At present, there is no uniform standard for motor protectors on the market, and almost every manufacturer has its own model specifications. In order to meet the needs of different customers, manufacturers have derived a lot of products for different purposes. The variety of products has brought many inconveniences to the selection of users. Users should fully consider the actual needs of motor protection when selecting models, and reasonably choose protection functions and protection methods. In order to achieve a good protection effect, the purpose of improving equipment operation reliability, reducing unplanned parking, and reducing accident losses can be achieved.
Second, the basic method of motor protector selection
(1) Conditions related to the selection:
The choice of motor protection has a reasonable relationship between the motor and the protector. The following provides several conditions and factors related to protection, which provide a reference for the user to select.
1. Motor: First understand the model specifications, motor function characteristics, protection type, rated voltage, rated current, rated power, power frequency, insulation level, etc. These contents basically provide a reference for users to choose and use the motor protector correctly.
2, environmental conditions: mainly refers to normal temperature, high temperature, high cold, corrosion, vibration, sand, altitude, electromagnetic pollution.
3, motor use: such as fans, pumps, air compressors, lathes, oil field pumping machines and other different mechanical characteristics, such as pump motor protectors, should have underload function, when the pump is pumping water, the protector needs Give a protection order.
4. Control system: The control mode includes manual, automatic, local control, remote control, stand-alone operation, centralized control of the production line, etc. The starting mode includes direct, buck, star triangle, frequency sensitive varistor, inverter, soft start and other starting methods.
5. Other aspects: The user's on-site production monitoring management is relatively random or rigorous, and the severity of the impact of abnormal shutdown on production.
There are many factors related to the selection of the motor protector, such as the installation position, the power supply, and the coordination with the power distribution system. It is also considered whether the new motor protector, the motor protection upgrade, or the accident The improvement of motor protection, etc.; also consider the difficulty of changing the protection mode of the motor and the degree of influence on production; the selection and adjustment of the motor protector should be considered comprehensively according to the actual working conditions on site.
