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Author

Zhu Yeye

Bio: Zhu Yeye is an academic researcher. The author has contributed to research in topics: Signal & Distribution transformer. The author has an hindex of 2, co-authored 3 publications receiving 10 citations.

Papers
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Proceedings ArticleDOI
Fan Zhang1, Shengchang Ji1, Yuhang Shi1, Yanjie Cui1, Lingyu Zhu1, Zhu Yeye 
06 Jul 2016
TL;DR: In this paper, the authors used the mechanism of transformer vibration and Fourier transform to determine the mechanical condition of a power transformer in a single-phase to three-phase case.
Abstract: As one of the most important equipment in power system, power transformer plays a major role in guarantying the safe and stable operation of power system. Among the faults in transformer, winding deformation takes a large part. Since 1970s, lots of method, such as Frequency Response Analysis, Low Voltage Impulse have been put into winding deformation detection. Among these methods, Vibration Analysis from oil tank has gained much attention through its advantage that it is closely related with the mechanical condition of winding and core and can be used in on-line monitoring. This paper based on the mechanism of transformer vibration and Fourier Transform, choose Fundamental Frequency of Vibration (FFV), Maximum Amplitude in Frequency spectrum (MAF) and Transformer Vibration Entropy (TVE) as vibration eigenvalue to indicate the mechanical condition of transformer. What's more, the failure threshold for diagnosis is acquired through 78 power transformer varying from 110kV to 750kV, single phase to three phase. Among the test results, the vibration eigenvalue from one 110kV power transformer who suffered an external short-circuit accident shows that the winding of 3 phases all have winding deformation. The conclusion and diagnosis results are proved to be effective after the transformer is sent back to the manufacturer and make a pendant-core examination. The diagnosis method for power transformer in this paper based on tank vibration can make contributions to condition monitoring.

6 citations

Patent
07 Jan 2015
TL;DR: In this article, a transformer winding and iron core surface vibration signal detecting system is presented, which consists of a laser vibration measurer, a data acquisition card, a computer and a support.
Abstract: The invention discloses a transformer winding and iron core surface vibration signal detecting system. The transformer winding and iron core surface vibration signal detecting system comprises a laser vibration measurer, a data acquisition card, a computer and a support used for supporting the laser vibration measurer, wherein the laser vibration measurer is fixed to the support, the included angle theta is formed between laser light emitted by the laser vibration measurer and the plane perpendicular to the transformer winding and iron core surface to be measured, the output end of the laser vibration measurer is connected with the input end of the data acquisition card, and the output end of the data acquisition card is connected with the input end of the computer. The invention further provides a transformer winding and iron core surface vibration signal detecting method. The transformer winding and iron core surface vibration signal detecting system and method can accurately measure vibration signals of to-be-measured positions of the transformer winding and iron core surface.

4 citations

Patent
10 Dec 2014
TL;DR: In this paper, a testing transformer capable of simulating various iron core and winding faults is presented, where the transformer consists of a first upper rod, a second upper rod and a second lower rod.
Abstract: The utility model discloses a testing transformer capable of simulating various iron core and winding faults. The testing transformer comprises a first upper rod, a second upper rod, a first lower rod, a second lower rod, a first iron core, a second iron core and a plurality of winding mechanisms, and each winding mechanism comprises a high-voltage winding, an upper high-voltage winding fixed disk, a lower high-voltage winding fixed disk, an upper low-voltage winding fixed disk, a lower low-voltage winding fixed disk, a low-voltage winding, a first adjusting mechanism, a second adjusting mechanism, a third adjusting mechanism, a fourth adjusting mechanism, a fifth adjusting mechanism and a sixth adjusting mechanism, wherein the first adjusting mechanism is used for adjusting the fastening force of the first iron core, the second adjusting mechanism is used for adjusting the fastening force of the second iron core, the third adjusting mechanism is used for adjusting the pressing force of the high-voltage winding, the fourth adjusting mechanism is used for adjusting the pressing force of the low-voltage winding, the fifth adjusting mechanism is used for deforming the low-voltage winding, and the sixth adjusting mechanism is used for deforming the high-voltage winding. The winding faults and the iron core faults in the transformer can be simulated.

1 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper , one kind of magnetic compensation method is adopted to suppress the dc bias, and the core vibration caused by the transformer magnetic state change is studied in detail, which could provide a basic method for reducing vibration.
Abstract: The variation of magnetic state of transformer often causes the violent vibration of the transformer various parts, especially the core. The most obvious magnetic state change of the transformer is usually caused by the dc component. In this article, one kind of magnetic compensation method is adopted to suppress the dc bias, and the core vibration caused by the transformer magnetic state change is studied in detail. At first, on the basis of measuring the magnetostriction and calculating the vibration displacement of transformer core, the research on the vibration increment created by the dc bias is carried out. Second, the transformer core vibration before and after the dc bias suppression is simulated, and the difference of the transformer with a magnetic compensation capacity is analyzed. Finally, based on the VIBXPERT1II FFT data acquisition and signal analyzer, the vibration of measuring points under the different magnetic state and the different measuring point under the same magnetic state are collected. The vibration tendency of each measuring point is given with the variation of the magnetic state. Thus, the vulnerable spot of the core vibration and the basic law of the transformer vibration are obtained, which could provide a basic method for the reducing vibration.1Registered Trademark.

5 citations

Proceedings ArticleDOI
01 Sep 2018
TL;DR: Time-frequency vibration analysis of transformer tank vibration characteristics can be used to monitor winding condition and diagnose winding fault and validate the correctness of Hilbert spectrum analysis of transient vibration response.
Abstract: Huge electromagnetic force during sudden short circuit can cause severe winding mechanical fault. Transformer tank vibration characteristics are closely related to winding mechanical condition. Transient vibration response on transformer tank under short circuit impact can be utilized to monitor winding condition and diagnose winding fault. Short circuit impact experiment according to IEC standard is performed on a 110kV transformer. 33 times impacts were performed at A-phase and tank vibration signal is recorded every time during the impact. Since transformer transient vibration signal is non-linear and non-stationary, this paper utilizes Hilbert-Huang Transform (HHT) methodology to analyze transformer vibration signal in time-frequency domain. 200Hz-1000Hz component in Hilbert spectrum is deeply studied. Image processing method is used to quantity the occurrence number of frequency above 200Hz in Hilbert spectrum. The result shows 800Hz-1000Hz component increases largely during 23rd impact compared with the previous impact result. Thus, 800Hz-1000Hz component in Hilbert spectrum can be regarded as an indicator to diagnose winding fault. What's more, Short Circuit Impedance (SCI) experiment shows that SCI variation rate of A-phase changes 1 % after 24th impact and increases to −21.85% after 33rd impact. Suspended core experiment after the short circuit impact experiment reveals that severe winding mechanical fault occurs in both high voltage winding and medium voltage winding. Both of the results validate the correctness of Hilbert spectrum analysis of transient vibration response. Therefore, time-frequency vibration analysis can be used to monitor winding condition and diagnose winding fault.

4 citations

Proceedings ArticleDOI
01 Oct 2018
TL;DR: A model created in COMSOL and Matlab software and a case study for a segment of windings displays the acquired results.
Abstract: Power transformers are vital components of the power system. These electrical devices can experience multiple types of faults within them. Mechanical defects are relatively difficult to detect since they occur inside the structure of the power transformer. Magnetostriction can create this type of faults in magnetic core and electrodynamic forces can cause them in windings. Diagnostic methods mainly use vibration information from the surface of transformer. This is an indirect approach and causes additional errors since vibrations need to propagate transformer structure before sensors receive them. However, it is possible to calculate the mechanical situation in windings by modelling this part of the transformer as a mass and spring system with forces acting upon it and applying dynamic genetic algorithm. This paper describes a model created in COMSOL and Matlab software and a case study for a segment of windings displays the acquired results.

4 citations

Patent
09 Nov 2016
TL;DR: In this paper, an experiment apparatus for simulating a transformer short circuit is described, which includes a transformer main body and a measuring control system, as well as an experiment method to estimate the capability of the transformer to resist short circuit.
Abstract: The invention discloses an experiment apparatus for simulating a transformer short circuit The experiment apparatus includes a transformer main body and a measuring control system The transformer main body includes: a screw (1) for axial tension; a fastener (2) for axial tension; a pressure plate (3) for press against the entire experiment apparatus; the screw (1) and the fastener (2) are intended for tensioning the pressure plate (3) and a pedestal (14) so as to press against an inner winding (9) and an outer winding (4); an outer winding iron yoke insulator (5); an inner winding iron yoke insulator (10); a laser sensor (12) The invention also discloses an experiment method for simulating transformer short circuit According to the invention, the experiment apparatus and the method can research the winding sate upon the short circuit of the transformer and estimate the capability of the transformer to resist short circuit

2 citations

Patent
09 Mar 2018
TL;DR: In this article, a flexible winding deformation simulation device is presented, which mainly consists of a high-voltage winding, a low voltage bracket, an iron core and clamps.
Abstract: The invention discloses a flexible winding deformation simulation device which mainly comprises a high-voltage winding, a low-voltage winding, a bottom plate, a high-voltage winding bracket, a low-voltage winding bracket, an iron core and clamps. By virtue of the characteristics that a flexible winding is liable to deform and recover and a bracket can be moved horizontally, deformation simulationon displacement, partial deformation, interturn short circuits and the like of a transformer can be achieved by changing the shape and/or adjusting the position of the flexible winding. Deformation situations of different parts and different shapes of the transformer are taken into account sufficiently, and a novel method for simulating actual winding deformation is provided; winding deformation includes most types of conventional transformer winding deformation, testing targets are provided for short circuit impedance testing and frequency response method testing, and calibration samples areprovided for testing instruments; and under the condition that a winding is not disassembled or pulled out, winding deformation of different shapes at different parts can be caused, and the device hasthe advantages of accuracy, reality, flexibility, visibility and reutilization.

2 citations