A method, system and application for monitoring the inter-turn insulation state of a reactor

Abstract

The invention provides a method, system and application for monitoring the inter-turn insulation state of a reactor, establishes a power reactor coil vibration simulation model, obtains the reactor coil vibration signal, and obtains the corresponding coil stress, displacement and acceleration; adopts variational mode decomposition Decompose the vibration signal of the reactor coil in different states into multiple limited-bandwidth eigenmode functions to complete the adaptive segmentation of the signal frequency band; calculate the relative entropy of each limited-bandwidth eigenmode function component and the original signal, and multiply the relative entropy The weight coefficient is obtained to obtain the weight divergence, which characterizes the time-frequency distribution characteristics of the mechanical vibration signal of the reactor coil; the relationship between the weight divergence and the inter-turn insulation state of the reactor coil is established by using the pattern recognition algorithm, and the relationship is optimized Solve until the set conditions are satisfied, and output the insulation state of the reactor coil at this time.

Description

technical field [0001] The invention 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 invention 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 lightning impuls...

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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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