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Restarting method

A restart and protector technology, applied in the direction of motor generator/starter, single multi-phase induction motor starter, electrical components, etc., can solve the damage to the motor and system, and cannot judge whether the system voltage meets the motor starting conditions, etc. question

Inactive Publication Date: 2009-05-20
SHANGHAI HUAJIAN ELECTRICAL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method cannot judge whether the system voltage meets the motor starting conditions, and may cause damage to the motor and the system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0005] Below with the electric motor restart of 4KW is example, the present invention is described further:

[0006] Set the fixed value on the intelligent protector: the recovery voltage is 95% of the rated voltage, the drop voltage is 60% of the rated voltage, and the delay closing time is 5S.

[0007] The whole process of realizing the power-on self-starting function is: after the system restores the power supply, the intelligent protector detects that the voltage recovery is greater than the recovery voltage 209V, and instructs the intelligent protector to delay the closing time for 5 seconds. Intelligent protector, the intelligent protector instructs the outlet relay to act, sends out the motor start signal, and completes the restart process of self-starting after power-on.

[0008] The whole process of realizing the power-on restart function is as follows: in the initial state, the intelligent protector detects that the motor running state voltage is greater than the rec...

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PUM

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Abstract

The invention discloses a restart method. The method comprises a structure including a voltage detection module, a current detection module, a timer and an output closing relay which are arranged in an intelligent protector. The method is characterized in that: according to parameters of different motors and contactors, setting thresholds of recovery voltage and dropout voltage, setting one time threshold of delay closing time and inputting the threshold into the intelligent protector for setting a restart mode. The restart method comprises a power on automatic start mode and a power on restart mode. The method has combined functions of restart, flexible delay and accurate detection of system voltage and can avoid series impact on a system caused by the start of a large motor or simultaneous start of a plurality of motors and damages to a motor due to the forced start of the motor when the system is under system voltage.

Description

1. Technical field: [0001] The invention relates to a method for restarting a motor, which relates to the technical field of a motor restart function, specifically: for an unattended motor circuit in continuous operation, the motor stops running due to power failure in the system, and the motor stops running after the system voltage is restored. Automated technology. 2. Background technology: [0002] At present, most of the restarting functions use delay relays, which delay for a period of time after the system voltage recovers to start the motor. This method cannot judge whether the system voltage meets the motor starting conditions, and may cause damage to the motor and the system. [0003] With the development of industry, many remote and dangerous places are left unattended. For the unattended motor circuit with continuous operation, when the system loses power and the motor stops running, in order to resume work as soon as possible, it is very necessary for the motor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/08H02P1/26
Inventor 王晓辉戴顺辉王琦刘尧华
Owner SHANGHAI HUAJIAN ELECTRICAL EQUIP
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