Variable frequency motor stator fault detection system based on zero sequence voltage analysis and detection method thereof

A variable frequency motor and zero-sequence voltage technology, applied in the direction of motor generator testing, measuring electrical variables, measuring electricity, etc., can solve problems such as influence, detection signal stator asymmetry, etc., achieve simple demodulation, and realize the effect of real-time monitoring

Active Publication Date: 2019-12-20
JIANGSU ELECTRIC POWER CO
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Problems solved by technology

At present, the most used detection method is the fault diagnosis method of high-frequency injection, and the detection signal is easily affected by the asymmetry of the stator.

Method used

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  • Variable frequency motor stator fault detection system based on zero sequence voltage analysis and detection method thereof
  • Variable frequency motor stator fault detection system based on zero sequence voltage analysis and detection method thereof

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Embodiment Construction

[0024] The specific implementation of the stator fault detection system of a variable frequency motor based on zero sequence voltage analysis of the present invention will be described in detail below with reference to the accompanying drawings.

[0025] Such as figure 1 As shown, the variable frequency motor stator fault detection system of the present invention includes a voltage acquisition unit, a signal conditioning unit, a control processing unit, a key input unit, a storage unit, a display unit, an alarm unit, and a communication unit. The voltage acquisition unit and the signal The conditioning unit and the control processing unit are connected in sequence, and the control processing unit is also connected to the key input unit, the storage unit, the display unit, the alarm unit, and the communication unit respectively; The motor stator fault detection system collects the zero-sequence voltage signal of the variable frequency motor, calculates the energy level, and judges...

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Abstract

The invention provides a variable frequency motor stator fault detection system based on zero sequence voltage analysis. The variable frequency motor stator fault detection system comprises a voltageacquisition unit, a signal conditioning unit, a control processing unit, a key input unit, a storage unit, a display unit, an alarm unit and a communication unit; the variable frequency motor stator fault detection system acquires a zero sequence voltage signal of a variable frequency motor, performs energy level calculation, and judges whether a stator fault of the variable frequency motor occursaccording to a second harmonic amplitude. The invention provides the variable frequency motor stator fault detection system based on zero-sequence voltage analysis and the detection method, and guarantee safe and reliable work of the variable frequency motor.

Description

Technical field [0001] The invention belongs to the technical field of electric power detection, and particularly relates to a variable frequency motor stator fault detection system and a detection method based on zero sequence voltage analysis. Background technique [0002] With the continuous development of science and technology, people's demand for high-performance and low-power drive systems is becoming more and more urgent, which in turn promotes the research and development and upgrade of frequency conversion motors. However, driving the motor with a frequency converter will cause the voltage change rate of the motor to rise sharply, increasing the possibility of short circuits between stator turns. In order to ensure the reliable operation of the variable frequency motor, effective monitoring of the stator failure of the variable frequency motor is required. At present, the most commonly used detection method is the fault diagnosis method of high frequency injection, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34
CPCG01R31/343
Inventor 滕松吴冲
Owner JIANGSU ELECTRIC POWER CO
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