Generalized protection measurement and control device of asynchronous motor

Abstract

The invention introduces a generalized protection measurement and control device aiming at a 380V-10kV asynchronous motor, providing an integral solution integrating electromotor state monitoring, electromotor fault protection and electromotor measurement and control from the intelligent angle of the equipment. The invention provides a method for identifying the operation state of the electromotor by a conjugate character signal filter. On the basis of the infinite impulse response (IIR) filter of a sequence, the current signal of the electromotor is measured in real time, thus the variation situation of the conjugate character signal is monitored in the electromotor starting process. According to the comparison of the output conjugate character signals, faults such as broken electromotor rotor bars, rotor eccentricity and the like, can be identified, and the electromotor state is monitored in an online mode, thereby providing a preventative protection function for the electromotor. The criterion is simple to calculate and is easy to realize and has the advantage of high precision. The digital protection measurement and control function of the electromotor which is widely used at present serves as the basis, the state monitoring function can be integrated without additional external signals, and comprehensive protection is further provided for the electromotor.

Description

Technical field [0001] The invention is a generalized protection and monitoring device for asynchronous motors. Asynchronous motors are widely used in industrial enterprises, so the present invention belongs to the industrial field. Background technique [0002] Asynchronous motor is an important electric load and power equipment of industrial enterprises, and its position in the production process is very important. Typical common faults of asynchronous motors can be divided into three categories, as shown in Table 1: [0003] Table 1 Common faults of asynchronous motors [0004] [0005] At present, most industrial enterprises in my country are equipped with intelligent protection and monitoring devices for asynchronous motors, providing functions such as stall, overcurrent, overheating, overvoltage, low voltage, unbalance, etc., which are perfect for electrical faults and external faults. The protection function. For mechanical failure, the majority of scientific researchers al...

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