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Transformer insulation life prediction and reliability evaluation method

A technology for insulation life and transformers, which is applied in the direction of testing dielectric strength, frequency measurement devices, etc., and can solve the problems of inability to accurately evaluate the reliability of transformers, inadvisable, and inability to accurately predict the life of transformers.

Active Publication Date: 2019-01-18
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

However, the current evaluation method based on FDS still fails to distinguish the influence of moisture and aging in the FDS test. It is not advisable to apply the method to the on-site transformer insulation life evaluation, and it is impossible to accurately evaluate the reliability of the transformer.

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  • Transformer insulation life prediction and reliability evaluation method
  • Transformer insulation life prediction and reliability evaluation method
  • Transformer insulation life prediction and reliability evaluation method

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Embodiment

[0081] Example: Transformer Insulation Life Model Evaluation

[0082] First, in order to verify the feasibility of the transformer insulation life assessment model for on-site transformer life assessment, two 110Kv double-winding transformers with different operation times in different substations of Sichuan Power Grid Corporation were taken as examples for insulation life assessment.

[0083] The on-site test uses the IDAX300 dielectric response analyzer, and the test frequency is set to 10 -3 ~10 3 Hz, and the peak value of the test voltage is set to 200V. At the beginning of the test, the test oil temperature on the top layer of 1# and 2# transformers was 26 and 28°C, and the fluctuation of the oil temperature on the top layer of the two transformers was less than 2°C during the whole test process. According to the XY model of oil-paper insulation and the FDS temperature translation method [21,22] , after the measured curve is processed, the curve of the reference temper...

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Abstract

Disclosed is a transformer insulation life prediction and reliability evaluation method. A new oil paper insulation state evaluation method based on a correction factor algorithm is proposed, and on this basis, a model for evaluating the insulation life of a transformer under combined influence of aging, moisture and temperature is created. Then, operation state scores are introduced into an aginglife evaluation model through relationships between operation states and life expectancy to propose a new model in which failure rates are jointly represented by insulation aging and the operation states. The transformer insulation life prediction and reliability evaluation method improves the evaluation accuracy of reliability of a transformer on the basis of considering interaction of aging andmoisture.

Description

technical field [0001] It belongs to the field of electrical engineering, especially the life evaluation and fault diagnosis method of power transformers considering the operating state and insulation life. Background technique [0002] The reliability of a power transformer refers to its ability to continue to operate safely and stably in the power system. As one of the key equipment in the power system, its health status is related to the safety and stability of the entire power grid. Therefore, it is of great significance to comprehensively and accurately evaluate the reliability of transformers by comprehensively considering multiple factors. [0003] The evaluation of transformer insulation life mainly depends on the state of internal oil-paper insulation, and moisture and aging degree are important factors affecting the state of insulation. The condition evaluation of oil-paper insulation is mainly based on the water content and aging degree. The increase of water con...

Claims

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Application Information

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IPC IPC(8): G01R31/12G01R23/02
CPCG01R23/02G01R31/12
Inventor 高波刘亚婕夏国强朱航李通杨雁
Owner SOUTHWEST JIAOTONG UNIV
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