Asynchronous motor stator winding inter-turn short circuit failure on-line detecting method and device

A technology for turn-to-turn short-circuit faults and asynchronous motors, which is applied in the field of on-line detection and device for inter-turn short-circuit faults of stator windings of asynchronous motors, and can solve problems such as the inability to determine the fault phase and the influence of stator current harmonic components

Inactive Publication Date: 2007-08-29
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

There is also the disadvantage that it is easily affected by the stator voltag

Method used

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  • Asynchronous motor stator winding inter-turn short circuit failure on-line detecting method and device
  • Asynchronous motor stator winding inter-turn short circuit failure on-line detecting method and device
  • Asynchronous motor stator winding inter-turn short circuit failure on-line detecting method and device

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Embodiment Construction

[0037] In fact, the present invention uses stator negative sequence apparent impedance filter value and stator apparent impedance angle as fault features, combines sample learning and detection threshold self-tuning technology, and detects incipient stator windings of asynchronous motors online with high sensitivity / high reliability Turn-to-turn short circuit fault. The research shows that the stator negative-sequence apparent impedance is a characteristic of the inter-turn short circuit fault of the asynchronous motor stator winding with good sensitivity and reliability. However, due to the modulation effect of the stator voltage and current harmonic components of the motor, its value fluctuates with time. It is not conducive to the detection of inter-turn short-circuit faults of stator windings. Therefore, digital low-pass filtering should be performed, and the filtering value of stator negative sequence apparent impedance should be used as fault characteristics to achieve th...

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Abstract

The invention relates to a online testing process for shorted fault of asynchronous motor's stator winding, which is belong to Detecting Technology. It was designed to solve the detecting problem of stator winding. The project is that it figures out the voltage and current of negative sequence and positive sequence of the stator winding by collecting three-phase stator voltage, instantaneous-current signal. Then using of normal motor sample reference document estimated the filter value of the stator negative sequence, figured out the stator negative sequence current fault component. And then base on the threshold of the stator negative sequence current fault component educe failure exponent. Finally according to the index judge whether to exist short circuit failure or not. This invention also gave corresponding detection device. Not only can high sensitivity, high reliability and on-line measurement asynchronous motor stator windings at the beginning of the early short circuit fault, but also can judge short circuit phase. This can effectively ensure the asynchronous motor operating safely.

Description

technical field [0001] The invention relates to a method and a device capable of on-line detection of initial and early short-circuit faults of stator windings of an asynchronous motor and determination of short-circuit phases, belonging to the detection technical field. Background technique [0002] As transmission machinery, asynchronous motors are widely used in industrial production and national defense, and their safe operation is very important. On-line detection of asynchronous motor faults (especially on-line detection of initial faults) is one of the key measures to ensure the safe operation of asynchronous motors. Turn-to-turn short circuit of stator winding is one of the common faults of asynchronous motors, the probability of occurrence is about 30%. This kind of fault originates from the aging and damage of inter-turn insulation, and its continuous development will lead to serious faults such as phase-to-phase short circuit. It is a progressive fault, so it can...

Claims

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Application Information

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IPC IPC(8): G01R31/34G01R31/06
Inventor 许伯强孙丽玲
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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