Method and system for monitoring inter-turn insulation state of reactor, and application

Abstract

The invention provides a method and system for monitoring an inter-turn insulation state of a reactor, and an application. The method is characterized in that a vibration simulation model of a power reactor coil is established, and a vibration signal of the reactor coil is acquired to obtain the corresponding coil stress, displacement and acceleration; variational mode decomposition is utilized todecompose vibration signals of the reactor coil under different states into multiple finite bandwidth eigenmode functions, and adaptive segmentation of the signal band is completed; the relative entropy of each finite bandwidth eigenmode function component and an original signal is calculated, the relative entropy is multiplied by a weight coefficient to obtain the weight divergence, and time-frequency distribution characteristics of mechanical vibration signals of the reactor coil are represented; the relationship between the weight divergence and the inter-turn insulation state of the reactor coil is established through the pattern identification algorithm, the relationship is optimized till the set conditions are met, and the current inter-turn insulation state of the reactor coil is outputted.

Description

technical field [0001] The present disclosure relates to a method, system and application for monitoring the inter-turn insulation state of a reactor. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] In recent years, there have been frequent dry-type air-core reactor burnout accidents. Analyzing the causes, inter-turn short-circuit faults caused by inter-turn insulation defects account for the main part. [0004] However, according to the knowledge of the inventor, the current detection methods for inter-turn insulation defects of reactors mainly include the leakage field detection method and the lightning impulse test method. Among them, the leakage field detection method is only suitable for direct short-circuit faults, and cannot detect invisible inter-turn faults; In the process of the lightning impulse test method, because the lightn...

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Problems solved by technology

[0004] However, according to the knowledge of the inventor, the current detection methods for inter-turn insulation defects of reactors mainly include the leakage field detection method and the lightning impulse test method. Among them, the leakage field detection method is only suitable for direct short-circuit faults, and cannot detect invisible inter-turn faults; In the process of the lightning impulse test method, because the lightning impulse voltage is applied to the detected device, the time is not long, so the detection effect is not ideal

[0005] In summary, the existing dry-type air-core reactor turn-to-turn insulation state determination process has problems such as off-line judgment, low efficiency of diagnostic methods, and poor accuracy of diagnostic results.

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