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Initial fault detection method and system of non-invasive asynchronous motor

An asynchronous motor and initial fault technology, applied in the field of instrumentation, can solve the problems of single detection algorithm and single type of asynchronous motor rotor fault detection, and achieve the effect of improving detection accuracy, high convenience, and troubleshooting.

Pending Publication Date: 2019-12-03
STATE GRID JIANGSU ELECTRIC POWER CO LTD MAINTENANCE BRANCH +1
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art to solve the technical problems in the prior art that the asynchronous motor rotor fault detection type is single and the detection algorithm is single

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  • Initial fault detection method and system of non-invasive asynchronous motor
  • Initial fault detection method and system of non-invasive asynchronous motor

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0020] The specific embodiment of the present invention provides a non-invasive asynchronous motor initial fault detection method, the method includes the following steps:

[0021] Step 1: Acquire the voltage and current signals of the local asynchronous motor stator, and convert and filter the voltage and current signals to obtain the waveform of the signal required to detect the initial fault of the asynchronous motor rotor, that is, the standard voltage and current signals . The voltage and current signals in this embodiment, that is, the voltage and current signals at the input end of the asynchronous motor stator, can be collected by using current clamps, Hall sensors, etc. in various com...

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Abstract

The invention discloses an initial fault detection method and system of a non-invasive asynchronous motor in the technical field of instruments and aims to solve the technical problems that the asynchronous motor in the prior art is simple in rotor fault detection type and single in detection algorithm and detection process and result cannot be remotely monitored. The method comprises the following steps of acquiring a voltage or / and current signal of a local motor stator, and transmitting the voltage or / and current signal to a cloud server; and performing detection and operation on the voltage or / and current signal by at least two types of detection algorithms, and acquiring a motor fault identification result, wherein the detection algorithm comprises at least two of fast Fourier transform, Hilbert transform and PARK vector algorithm, and the motor fault comprises a motor rotor fault.

Description

technical field [0001] The invention relates to a non-invasive detection method and system for an initial fault of an asynchronous motor, belonging to the technical field of instruments and meters. Background technique [0002] Asynchronous motors have been widely used in the national economy because of their simple structure, long service life, and low cost. In various electric transmission systems, about 90% are driven by asynchronous motors; in the total load of the power grid, asynchronous motors account for about 60%. However, due to the harsh working conditions such as heavy load, frequent starting and braking, excessive mechanical stress and thermal stress in the actual operation process, as well as the inherent defects of the motor rotor itself, faults such as eccentricity, broken bars or end ring cracks are prone to occur. , will not only cause huge economic losses, but also endanger personal safety in severe cases. Therefore, it is of great significance to detect...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34G01R19/00
CPCG01R31/34G01R31/346G01R19/00
Inventor 张兆君戴锋汤晓峥赵学华汪海洋刘一丹宋金山朱超王攀攀许浩
Owner STATE GRID JIANGSU ELECTRIC POWER CO LTD MAINTENANCE BRANCH
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