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Evaluation method of main insulation aging state of large generator stator winding based on frequency domain dielectric spectrum method

A generator stator, frequency-domain dielectric spectrum technology, applied in the direction of motor generator testing, measuring resistance/reactance/impedance, measuring devices, etc., can solve the problems of less insulation information, more interference information, and singleness, and achieve test interference small effect

Active Publication Date: 2017-09-01
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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Problems solved by technology

There are problems in the actual measurement: first, some tests need to apply high voltage, which is easy to cause new damage to the insulation and reduce the service life of the generator; second, these detection methods are limited to a single information, providing little insulation information, and all There is a lot of interference information, and the test results are very scattered, so it is difficult to fully and accurately judge the insulation status of the generator

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  • Evaluation method of main insulation aging state of large generator stator winding based on frequency domain dielectric spectrum method
  • Evaluation method of main insulation aging state of large generator stator winding based on frequency domain dielectric spectrum method
  • Evaluation method of main insulation aging state of large generator stator winding based on frequency domain dielectric spectrum method

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Embodiment Construction

[0037] Such as figure 1 Shown is a schematic diagram of the frequency-domain dielectric spectrum test adopted by the present invention. What the present invention adopts is the IDAX300 dielectric spectrum tester produced by Sweden MEGGER company, and its measurement principle: test the polarization characteristics of the insulating medium under AC voltage, measure the current amplitude and phase flowing through the test object by applying a sinusoidal voltage, The polarization parameters related to frequency f such as relative permittivity, dielectric loss tangent tanδ, complex permittivity, etc. are obtained. The specific operation steps when measuring the main insulation of the stator winding of the generator are as follows: apply variable frequency voltage excitation to the tested sample, measure the current at the same time, and calculate the complex permittivity at the corresponding frequency according to the current and voltage at different frequencies.

[0038] Such as...

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Abstract

The present invention disclosed the evaluation method of large -scale generators based on the frequency domain dielectric spectrum method.The high -voltage end of the test cable of the winding spectrum tester is connected to the ground end of the generator shell to the ground end of the test cable of the dielectric spectrum tester; set the parameters and start the test;The frequency characteristic curve ε‑f of the frequency of electricity is obtained through formula calculations to obtain the current main insulating medium loss cause incremental ΔtanΔN; the obtained medium loss causes increase ΔtanΔN, evaluate the aging state of the main insulation of the generator stator winding.The present invention is a non -broken test method. Its testing principle is simple and the wiring is convenient. It can accurately determine the medium loss ΔtanΔN of the medium loss cause of the main insulation of the generator stator winding group, thereby effectively evaluating the aging state of the generator.

Description

technical field [0001] The invention belongs to the technical field of main insulation state evaluation and life prediction of generator stator windings, and specifically refers to a large-scale generator stator winding main insulation aging state evaluation method based on frequency domain dielectric spectrum method. Background technique [0002] Large-scale generators are one of the most important and critical equipment in the power system, and their safety and reliability are directly related to the safety and stability of the power system. During the operation of the motor, the main insulation of the generator winding is subject to the combined effects of multi-factor stresses such as electricity, heat, machinery and various environmental factors, and gradually ages. With the growth of time, the aging of insulation not only reduces the mechanical strength and electrical strength of the generator, but also causes insulation breakdown and causes the motor to fail. Therefo...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/34G01R27/26
Inventor 张征平涂小涛高波冉旺王兵胡卫郝长金
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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