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Method and apparatus for power supply phase-missing detection and phase sequence correction of triphase AC motor

A technology of three-phase alternating current and power supply phase loss, which is used in motor generator testing, emergency protection circuit devices, electrical components, etc.

Inactive Publication Date: 2006-11-22
上海国鼎数码科技有限公司
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  • Abstract
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Problems solved by technology

[0002] If the power supply of a three-phase AC motor suddenly loses one phase during operation, the current in the motor will increase sharply due to phase imbalance, and the motor will be burned out.
[0003] In addition, due to the inherent characteristics of solid-state relays, when one phase of the three-phase power supply is lost during motor operation, the remaining two-phase power supply current will form a backflow through the motor and the solid-state relay, thereby affecting the judgment result of the power supply phase loss detection
[0004] There are also three power input terminals of the three-phase AC motor. If the connection position is changed during installation or maintenance, it may cause a change in the phase sequence of the motor's input power supply, which will change the running direction of the motor and affect its normal operation.

Method used

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  • Method and apparatus for power supply phase-missing detection and phase sequence correction of triphase AC motor
  • Method and apparatus for power supply phase-missing detection and phase sequence correction of triphase AC motor

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Embodiment Construction

[0042] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments and accompanying drawings.

[0043] according to Figure 6As shown, it is a schematic diagram of a three-phase AC motor power supply phase loss detection and phase sequence correction. The three-phase AC motor power supply phase loss and phase sequence detection device shown in the figure includes a power supply phase loss and A phase sequence detection module, a control system power supply phase loss detection module connected with the control system power transformer and a non-control system power supply phase loss detection module connected with the current sensor.

[0044] The power supply phase loss and phase sequence detection module converts the external three-phase AC power into square wave signals Vu and Vv with fixed phase difference. This...

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Abstract

The invention discloses a three-phase AC motor power phase-losing detection and phase-correcting method and device, which is characterized by the following: judging whether outer power is phase-losing and phase-sequence changing through detecting three-phase AC power phase-position sequence; avoiding error judgment for loop of the three-phase motor and solid relay; designing the device according to the character of microprocessor and digital signal processor.

Description

technical field [0001] The invention relates to the technical field of three-phase AC motor power supply phase loss detection and phase sequence correction, in particular provides a further detection method and device for the power supply phase loss detection during operation of a three-phase AC motor driven by a solid state relay. The invention is applied to the power supply phase loss detection and phase sequence correction of all three-phase AC motors. Background technique [0002] If the power supply suddenly loses one phase during the operation of the three-phase AC motor, the current in the motor will increase sharply due to phase imbalance, and the motor will be burned out. If the motor is driven by a solid state relay, the solid state relay is likely to burn out. In order to prevent motors or solid state relays from being damaged due to lack of phase, there must be a simple, safe, reliable and low-cost method for real-time detection of power supply phase loss and ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/09G01R31/34
Inventor 余虎张涵许诺
Owner 上海国鼎数码科技有限公司
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