Informationized motor protection device

Abstract

The invention discloses an informationized motor protection device, and belongs to the technical field of motor protection. The device comprises a motor protection device. One end of the motor protection device is connected with a motor through a contactor, and the other end is connected with an upper management computer through a data interface. The motor protection device comprises a CPU main system, an analog quantity input, a man-machine interaction interface and a communication interface. The CPU main system comprises a fault execution control circuit; and the analog quantity input comprises a current and voltage transformer and a signal conditioning circuit. The motor protection device is simple in structure, convenient to use and capable of completing multiple protections such as phase loss, overload, rotation blocking, short circuit, overvoltage and undervoltage of the motor; intelligent judgment of fault hidden dangers and working faults is carried out, an alarm is given or asystem power supply is cut off before the faults occur, so that motor damage is prevented, and a user is reminded to remove the faults in time; and in the using process of the motor, the device achieves a good protection effect, is high in practicability, and is suitable for application and popularization.

Description

technical field [0001] The invention relates to the technical field of motor protection, in particular to an informationized motor protection device. Background technique [0002] A motor is an electromagnetic device that converts or transmits electrical energy according to the law of electromagnetic induction. The motor is represented by the letter M in the circuit, and its main function is to generate driving torque. As a power source for electrical appliances or various machines, the generator is represented by the letter G in the circuit. Its main function is to use mechanical energy to convert electrical energy. [0003] With the continuous improvement of the level of industrial modernization, the importance of the safe and stable operation of motors to modern industry is self-evident. Therefore, effective monitoring and protection of motor running status has important theoretical significance and engineering application value. At this stage, the most common motor pro...

AI Technical Summary

Problems solved by technology

But it has few protection functions, no phase failure protection, and it cannot protect the motor from failures such as poor ventilation, bore sweeping, stalled rotor, long-term overload and frequent starting.

In addition, thermal relays also have defects such as poor repeatability, inability to be used again after large current overload or short circuit fault, large adjustment error, susceptible to misoperation or refusal to operate due to ambient temperature, high power consumption, many consumables, and backward performance indicators.

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