Intelligent motor protection system

Abstract

The invention discloses an intelligent motor protection system. The intelligent motor protection system comprises a controller, an A / D module, a switching value input module, a switch-in isolation module, an isolation module, a communication module and a liquid crystal display screen, wherein the controller is connected with the A / D module, the switching value input module, the switch-in isolationmodule, the isolation module, the communication module and the liquid crystal display screen; an output voltage or current of a motor needing to be protected is connected with the A / D module; and theisolation module is connected with the current input end of the motor needing to be protected. The system provided by the invention can provide comprehensive protection control for the motor; when the motor has the problem of over-current, under-current, phase failure, stalling, short circuit, overvoltage, under-voltage, electric leakage, three-phase imbalance, overheating, grounding, bear abrasion, stator and rotor eccentricity or winding aging, an alarm is given or protection control is carried out; and the system has the advantages of being energy-saving, sensitive in action, high in accuracy, resistant to impact vibration, good in repeatability, complete in protection function, low in power consumption and the like.

Description

technical field [0001] The invention relates to a walking system, in particular to an intelligent motor protection system. Background technique [0002] As an important part of the drive system, the motor occupies a pivotal position in the national economy. Its use has penetrated into almost all walks of life. It is an important guarantee for the normal progress of industry, agriculture, national defense construction and people's life, thus ensuring the normal operation of the motor. Operation is very important, and it is not uncommon for motors to burn out or even cause major safety accidents during use. According to incomplete statistics, the electricity consumed by motor burnouts in the country reaches tens of millions of kWh each year, and the number of motor burnt out reaches 200,000. More than one unit, the capacity is about 40 million kilowatts, the electromagnetic wire consumed by maintenance is about 50 million kilograms, and the repair cost is 2 billion yuan, and t...

AI Technical Summary

Problems solved by technology

All of these have caused the current motor to be more easily damaged than in the past, especially the highest frequency of faults such as overload, short circuit, phase loss, and bore sweeping.

[0004] Traditional motor protection devices are mainly based on thermal relays, but thermal relays have low sensitivity, large errors, poor stability, and unreliable protection.

The fact is that even though many devices are equipped with thermal relays, the phenomenon that the motor is damaged and affects normal production is still common.

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