Insulation damage fault detection device and detection method for large generator stator core teeth based on electromagnetic induction

Abstract

The invention discloses an electromagnetic induction-based insulation damage detection device and a detection method for large-scale generator stator core teeth. The detection device includes an AC power supply, a voltage regulator, a sampling resistor, a Chattock magnetometer, a lock-in amplifier, and a data acquisition card. It is connected with the computer, AC power supply, voltage regulator and sampling resistor through cables to form a closed excitation circuit. The stator core to be tested is sleeved on the cable of the closed excitation circuit. The Chattock magnetometer spans two adjacent pieces of the stator core. Between the teeth, the lock-in amplifier has two input ports and one output port, and the two input ports are respectively connected to the cable in the closed excitation circuit and the Chattock magnetometer, and the data acquisition card also has two input ports and one output port port, the two input ports are respectively connected to the sampling resistor and the lock-in amplifier, and the detection device can effectively judge whether there is an insulation damage fault between the stator core teeth. The invention also discloses its detection method.

Description

technical field [0001] The invention relates to large-scale generator detection equipment and a detection method, in particular to an electromagnetic induction-based large-scale generator stator iron core insulation damage fault detection device and detection method. Background technique [0002] With the continuous development and growth of China's electric power industry, the demand for large generators in various power plants is also increasing, and the generator itself is also developing towards the trend of large capacity and high voltage. As one of the most critical equipment in the power system, the safe and reliable operation of the generator directly affects the reliability of the power system operation. If the generator breaks down, especially if the generator is out of service due to the failure, it will not only affect the power generation efficiency, but also have an adverse impact on the production and life of the entire society. Therefore, achieving "early de...

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Problems solved by technology

At present, the iron loss method is often used to detect stator cores. Although this method can basically meet the detection of core faults, it also has its shortcomings and deficiencies.

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