Intelligent low-tension motor protection device

Abstract

The invention provides an intelligent low-tension motor protection device. The intelligent low-tension motor protection device includes a CPU module, an alternating current signal input module, a communication interface module, an on-off input module, an on-off output module, an analog quantity output module, a man-machine interface module and the like, wherein the CPU is communicated with each module; the alternating current signal input module converts the acquired voltage current signals into signals which can be received by the CPU, and the transmits the signals to the CPU; the communication interface module mainly realizes remote data communication between the protection device and other monitoring centers; the on-off input module transmits the acquired on-off input signals and otherquantity of state information to the CPU; the on-off output module transmits the on-off output signals of the CPU to an external control circuit; the analog quantity output module mainly supplies standard output current for the external of the protection device; and the man-machine interface module is used for realizing information interaction between the protection device and the external circuit.

Description

technical field [0001] The invention relates to an intelligent low-voltage motor protection device, which belongs to the technical field of electric power systems. Background technique [0002] The motor is a device that converts electrical energy into mechanical energy output, and is the source of power for other electromechanical equipment. It has been widely used in industries such as machining, metallurgy, coal, petroleum, chemical industry, and home appliances. In the actual use of the motor, the harsh operating environment and the working state beyond the technical indicators are the main reasons for various electrical failures of the motor. The direct and indirect losses caused by the failure or damage of the motor are quite huge. According to incomplete statistics, there are about 20 million medium-sized motors used in the country, and about 16% of the motors are burned out each year, about 3.2 million units. The average maintenance cost of each unit is 1,000 yuan, a...

AI Technical Summary

Problems solved by technology

Asymmetrical faults mainly include phase failure, phase-to-phase short circuit, inter-turn short circuit, three-phase unbalance, etc. The damage to the motor is mainly caused by the negative sequence effect caused by the negative sequence current, which may cause heating at the end of the motor, rotor vibration and reduced starting torque, etc. series of questions

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