A method for detecting inter-turn short-circuit faults of reactors based on the vibration distribution of the outer casing

Abstract

The invention discloses a reactor turn-to-turn short-circuit fault detection method based on the vibration distribution of the outer envelope. Each measuring point is encapsulated on the outer layer of the reactor, and the vibration signal under normal operation is initially measured, and the distributed optical fiber is used to measure the vibration or The conventional vibration measurement device of the laser vibrometer measures the array of measuring points. Under the excitation of 50Hz by the reactor, the vibration distribution of the array of measuring points is measured synchronously, and the main vibration components in the vibration signals of each measuring point are extracted by using Fourier transform. Real-time vibration amplitude distribution and vibration phase distribution at each frequency. If the reactor of the real-time measurement segment has a disturbance in the vibration amplitude distribution or phase distribution at a certain frequency, the vibration signal segment is continuously collected again and confirmed by Fourier transform analysis. , if the analysis results are still different from the normal working conditions, it is preliminarily speculated that the reactor operation is abnormal, and an inter-turn short circuit fault alarm is issued. The invention has simple operation, low cost and can realize on-line monitoring.

Description

technical field [0001] The invention belongs to the technical field of fault detection and diagnosis, and in particular relates to a method for detecting a short-circuit fault between turns of a reactor based on vibration distribution of an outer package. Background technique [0002] With the increasing capacity of UHV DC transmission projects, the demand for reactors in power systems, especially dry-type air-core reactors, also increases. Reactors play an important role in limiting inrush current and balancing reactive power. When the reactor has an inter-turn insulation fault, it will cause great damage to the long-term use of the reactor. Turn-to-turn short circuit is a common and frequent condition in insulation faults. If it is not detected in time, it will greatly interfere with the stability of the power system. Proposing a reasonable, effective, and low-cost reactor turn-to-turn short-circuit detection method has gradually become the focus of research. [0003] A...

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Problems solved by technology

[0004] The purpose of the present invention is to propose a solution to the problem that the current detection method has high cost and is not easy to be widely used. The inter-turn insulation detection is performed based on the vibration distribution characteristics of the outer package of the tested reactor, which is simple to operate and low in cost of the detection device. And it will not affect the normal operation of the reactor tested equipment, and can realize online monitoring

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