Synchronous Motor Rotor Winding Short Circuit Fault Diagnosis Method Based on Stator Current Injection

A technology for synchronous motors and rotor windings, which is applied in the direction of motor generator testing, electrical measurement, and electrical variable measurement. It can solve the problems of unit vibration deterioration, high economic costs, and long outage time, achieving fast speed and low detection costs. The effect of low and high diagnostic accuracy

Inactive Publication Date: 2017-11-24
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

As we all know, taking out the rotor to check the fault requires a longer downtime, high economic cost, and the vibration of the unit may become worse after the rotor is reinstalled. Therefore, the offline detection should try to avoid pulling out the generator rotor

Method used

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  • Synchronous Motor Rotor Winding Short Circuit Fault Diagnosis Method Based on Stator Current Injection
  • Synchronous Motor Rotor Winding Short Circuit Fault Diagnosis Method Based on Stator Current Injection
  • Synchronous Motor Rotor Winding Short Circuit Fault Diagnosis Method Based on Stator Current Injection

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Embodiment Construction

[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0042] A method for diagnosing short-circuit faults in rotor windings of synchronous motors based on stator current injection, comprising the following steps:

[0043] Step A. Select any one-phase winding of the stator of the synchronous motor as the AC voltage input winding, connect the AC voltage source, and the AC voltage input winding generates an AC current under the excitation of the AC voltage source, inside the generator Form a pulsating magnetic field;

[0044] Step B. Rotate the rotor of the synchronous motor so that the axis of the rotor winding coincides with the axis of the AC voltage input winding, and the pulse vibration magnetic field passes through the rotor winding of the synchronous motor vertically;

[0045] Step C. Measure the voltage and current of the AC voltage input winding, and calculate and measure the AC i...

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Abstract

The invention discloses a synchronous motor rotor winding short circuit fault diagnosis method based on stator current injection, and the method comprises the following steps: selecting a winding of any phase of a stator of a synchronous motor as an AC voltage input winding, generating alternating current under the excitation of an AC voltage source, and forming a pulse-shake magnetic field in a power generator; rotating the rotor of a synchronous motor and enabling the pulse-shake magnetic field to vertically pass through the rotor winding of the synchronous motor; measuring the voltage and current of the AC voltage input winding, and calculating and measuring AC impedance; calculating a fault judgment value (shown in the description); and judging that there is a rotor winding short circuit fault happening to the synchronous motor if the fault judgment value is greater than a preset threshold value. The method provided by the invention does not need to take out the rotor, and avoids a condition that a possible vibrating state of the rotor becomes poor after being reassembled The method is low in detection cost, is high in speed, achieves a higher diagnosis precision, and can be widely used for the off-line detection of the synchronous motor rotor winding short circuit fault.

Description

technical field [0001] The invention relates to a method for diagnosing short-circuit faults of rotor windings of synchronous motors, in particular to a method for diagnosing short-circuit faults of rotor windings of synchronous motors based on stator current injection, and belongs to the technical field of generators. Background technique [0002] The rotor winding short-circuit fault of synchronous motors has always been a difficult problem for engineers and technicians. In recent years, rapid progress has been made in the diagnosis of rotor winding short-circuit faults of synchronous motors. Some detection methods have been continuously improved and developed in practical applications to help operators. The fault handling time is shortened, and the downtime of the unit is reduced. [0003] At present, the diagnosis of rotor winding short circuit mainly includes offline and online methods. The online diagnosis method is highly praised because it can find faults in time. At...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/06G01R31/34
Inventor 武玉才李永刚王海蛟
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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