A Comprehensive Calculation Method for Measuring the Starting Moment of Steep Pulse Rising Edge

Abstract

The invention relates to a comprehensive calculation method for measuring the initial moment of the rising edge of a steep pulse, which includes the use of the MUSIC algorithm and the energy inflection point method algorithm. The MUSIC algorithm is used to measure the amount of data and the amount of calculation is large, and the location of the fault point requires accuracy, and The situation that requires follow-up comprehensive diagnosis and analysis; the energy inflection point algorithm is used for the situation where the amount of data detected by the on-site detection equipment is small or only fast analysis is required, and precise fault location is not required; the present invention uses the MUSIC algorithm to estimate the origin of the repetitive pulse injection signal and the characteristic curve It can locate the fault source by time difference and pulse propagation speed, which is more suitable for occasions with high fault location accuracy; the energy inflection point method is used to find the pulse start time and calculate the propagation time difference of repeated pulse signals, with calculation The advantages of high efficiency and convenient on-site use.

Description

technical field [0001] The invention relates to a comprehensive calculation method for measuring the initial moment of a steep pulse rising edge. Background technique [0002] In power equipment, winding coil structural components, as a common electromagnetic energy conversion component, have been widely used in various forms of equipment and play an extremely important role. Turn-to-turn short-circuit faults of winding coils are one of the main factors affecting the normal operation of power equipment such as generator rotors, transformer windings, and reactor windings. Therefore, it is of great significance to realize the rapid and accurate positioning of inter-turn short circuit faults of winding coils and the subsequent comprehensive diagnosis and analysis. [0003] Over the years, researchers have used techniques such as DC resistance method, AC impedance method and detection coil method to diagnose inter-turn short circuits in windings. However, the DC resistance met...

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Problems solved by technology

However, the on-site detection signals of these detection methods are affected by interference such as complex electromagnetic environment and substation corona, and their rising edges are often blurred and difficult to read. The resulting time difference calculation error has greatly affected the positioning analysis.

[0006] Based on the above analysis, the reading of the starting time of the steep pulse rising edge is of great significance for the rapid and precise location of the inter-turn short circuit fault of the winding coil, but the existing methods have shortcomings in the reading accuracy of the rising edge time. In the fault diagnosis and analysis of power equipment, there is a lack of scientific, accurate and convenient methods for measuring the starting time of the rising edge of steep pulses

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