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Motor digital type protector

A technology of protectors and motors, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as difficult distinction, difficult design, and failure

Inactive Publication Date: 2010-06-30
上海万松电气设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For motor protectors with analog circuits, it is difficult to perform phase loss protection or called phase failure protection
Because when the three-phase motor is running with a lack of phase, it will appear as a low-fold overcurrent fault in terms of current protection, which is difficult to distinguish. Therefore, the phase loss protection of general motor protectors is a difficult point in design.
At the same time, the anti-interference at this time is also a very difficult problem.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment

[0024] Embodiment: A practical self-correcting motor protector based on digital sequential circuit is proposed to solve the problems of phase loss protection and anti-interference.

[0025] The three-phase current signal is converted into the pulse signal of the digital sequence circuit: the rectifier circuit first rectifies the AC current signal into a pulsating DC signal, removes the DC part through the DC blocking circuit, and transforms it into a digital sequence circuit after being reshaped by the Schmitt circuit Pulse signal. The effective pulse signal is 100 Hz and 300 Hz, and can also be directly converted into a pulse signal of a digital sequential circuit with an alternating current signal. The effective pulse signal is 50 Hz and 150 Hz. The two are equivalent, the same below; the following circuit description takes the effective pulse signal of 100 Hz and 300 Hz as an example.

[0026] The pulse signal of the digital sequential circuit converted from the current signal...

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PUM

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Abstract

The invention discloses a motor digital type protector which solves the problems of high-precision protection and anti-jamming property. The technical scheme of the invention aims to provide a motor digital type protector, and simultaneously solves the problems of current protection, open-phase protection and anti-jamming property. The motor protector is provided with a current effective value detecting circuit, a signal processing circuit and a trip circuit, and is characterized in that the current effective value detecting circuit is provided with a current effective value detecting circuit for separating frequency signals of current pulses.

Description

Technical field [0001] The invention belongs to the field of low-voltage electrical appliances, and relates to a motor protector, in particular to a digital motor protector. Background technique [0002] The electric motor is the electrical appliance that consumes the highest proportion of electric energy, with a large quantity and a wide range. Due to the various loads faced by the motor, the situation faced by the motor protection is complicated. The common one is the motor protector of the analog circuit, and the general signal detection element is a current transformer. The main faults that need protection are overcurrent and phase-loss operation. The commonly used method is threshold protection. When the current reaches the set protection value, the protection starts, and the power supply can be disconnected with a delay to protect the motor. For the motor protector of the analog circuit, it is difficult to perform phase-loss protection or called phase-opening protection. ...

Claims

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Application Information

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IPC IPC(8): H02H7/08H02H7/09
Inventor 洪振海朱守云
Owner 上海万松电气设备有限公司
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