Wound type motor protector and protection method thereof

Abstract

The invention relates to a wound type motor protector and a protection method thereof. The wound type motor protector comprises a power supply circuit that is connected with all circuits. And the wound type motor protector is characterized in that: the motor protector comprises a current signal preprocessing circuit, a temperature signal collection circuit, an A / D conversion circuit, a microprocessor, a keyboard and display circuit, an alarm and trip control circuit, and a communication interface circuit. The current signal preprocessing circuit and the temperature signal collection circuit are connected with the keyboard and display circuit and the alarm and trip control circuit through the A / D conversion circuit and the microprocessor. The microprocessor is connected with an upper computer through the communication interface circuit. According to the invention, a design of two single-chip microcomputers is employed; a response speed and an execution speed of the protector and hardware reliability are improved; a demand of integration of a protection function, a measurement function, a control function and a communication function of a wound type motor is met; one machine with multiple functions is realized; and an ampere meter, a voltmeter, a thermorelay, a time relay and a leakage relay and the like can be replaced.

Description

technical field [0001] The invention relates to a motor protection device, in particular to a wire-wound motor protector and a protection method thereof. Background technique [0002] Faults such as overcurrent, stalled rotor, overheating, and short circuit are the main causes of motor damage. Motors are relatively expensive and expensive to maintain, and they are important equipment for production. Once a fault occurs, it will cause heavy losses. Therefore, it is very important to implement effective protection for them. It is usually protected by installing a fuse and a thermal relay device. However, traditional thermal relay protection devices have few functions, poor repeatability, large adjustment errors, and are easily affected by ambient temperature to malfunction or refuse to operate, and they are all single-machine operation without network control. [0003] The characteristics of the wound motor are often used in frequent starting occasions, and the starting curr...

AI Technical Summary

Problems solved by technology

[0004] At present, the motor protectors that have been used basically cannot meet the protection of wound motors, and have disadvantages such as simple functions, poor processing capabilities, slow computing speed, imperfect protection performance, and poor network performance, which limits its application and development.

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