Intelligent motor protector and protection method thereof

A motor protector, intelligent technology, applied in the direction of emergency protection circuit device, automatic disconnection emergency protection device, electrical components, etc., can solve the problem of instantaneous fluctuation of three-phase voltage, that is, provide protection for power grid shaking, digital logic circuit circuit Complex structure, economic loss of continuous production enterprises and other problems, to achieve the effect of convenient parameter adjustment, low manufacturing cost and long service life

Inactive Publication Date: 2012-11-21
BAOWU CHARCOAL MATERIAL TECH CO LTD
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

Although this type of technology can realize overcurrent and phase loss protection, it cannot provide protection against instantaneous fluctuations in three-phase voltage, that is, power grid swaying
Because, when the grid voltage fluctuates instantaneously and the power supply voltage is too low, the AC contactor will trip due to the l

Method used

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  • Intelligent motor protector and protection method thereof
  • Intelligent motor protector and protection method thereof
  • Intelligent motor protector and protection method thereof

Examples

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Example Embodiment

[0033] In order to better understand the above technical solutions of the present invention, the following further describes in detail with reference to the accompanying drawings and embodiments.

[0034] The hardware structure diagram of the intelligent motor protector of the present invention is as follows figure 1 As shown, the input port 1, the signal and power processing unit 2, the central processing unit 3, the power control output unit 5, the output port 6 and the human-computer interaction unit 4, are characterized in that the signal and power processing unit includes a current signal processing circuit, A voltage signal processing circuit and a power supply module. The central processing unit includes an analog-to-digital converter, a microprocessor, and a memory. The microprocessor's fault protection control signal and electric shock restart signal output terminals are connected to the power control output unit Output port.

[0035] In this embodiment, the input port 1 i...

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Abstract

The invention relates to the field of power electronics, in particular to an intelligent motor protector and a protection method thereof. The intelligent motor protector is composed of an input port, a signal and power supply processing unit, a central processing unit, a power control output unit, an output port and a human-computer interaction unit. The signal and power supply processing unit comprises a current signal processing circuit, a voltage signal processing circuit and a power supply module. The central processing unit comprises an analog-to-digital converter, a microprocessor and a storage, wherein a failure protection control signal and electricity-shaking restarting signal output end of the microprocessor is connected onto the output port through the power control output unit. The motor protection method includes steps of voltage and current sampling input, overcurrent and short circuit protection, overload protection, overvoltage protection and electricity-shaking restarting protection. The intelligent motor protector is high in reliability, fast and flexible to control, enables motor protection to reliably act in failure states such as overcurrent, over load and pressure loss of a motor, and can automatically recover operation in the power grid electricity-shaking state.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a motor protection device and a protection method for a low-voltage three-phase asynchronous motor control system. Background technique [0002] Traditional motor protection devices rely on air switches, fuses, and thermal relays as protection components. Among them, the air switch and fuse are used for motor short circuit protection, and the thermal relay is used for motor overload protection. Although the air switch can quickly cut off the short-circuit current, its current judgment ability is not very accurate, and leapfrog tripping accidents often occur, which expands the scope of the accident. The fuse can easily cause the motor to be damaged due to phase-open operation, so it is not an ideal protection component. The thermal relay has single function, low sensitivity, large error and poor stability. All these defects will cause unreliable motor protection, and easily dam...

Claims

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Application Information

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IPC IPC(8): H02H7/085H02H7/09H02H3/06
Inventor 艾德跃
Owner BAOWU CHARCOAL MATERIAL TECH CO LTD
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