Symptoms of Winding Insulation Aging After 37 Years of Service Life in a Hydrogenerator

Weiers, T.

doi:10.1109/tec.2009.2032625

Cited by 7 publications

(2 citation statements)

References 13 publications

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“…Insulating materials, which are used for insulation of the rotor windings, are exposed to thermal, electrical, mechanical, and environmental stresses. The aging of the generator, among other things, is reflected in the aging of the insulation, which may lead to shorted turns, and then to ground faults [11][12][13].…”

Section: Shorted Turnsmentioning

confidence: 99%

Fault detection algorithm used in a magnetic monitoring system of the hydrogenerator

Babic

Milić

Rakić

2017

IET Electric Power Applications

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In this study, the authors propose a fault detection algorithm used in an on-line magnetic monitoring system in the hydropower plant. The proposed algorithm is based on two magnetic measuring methods: measurement of (inner) flux within generator in air gap and measurement of stator leakage (outer) flux outside of the generator. The system has to ensure, in situ and real time, magnetic monitoring and fault detection of hydrogenerator. The monitoring system is also useful for modern maintenance approach such as a condition based maintenance without generators' work interruption and better planned and preventive maintenance in the power plant. The proposed system successfully detects the presence of magnetic unbalance of hydrogenerator, occurring as a consequence of shorted turns in the windings of the rotor poles or air gap asymmetry. The presented measurement results are achieved in real exploitation conditions.

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Section: Shorted Turnsmentioning

confidence: 99%

Fault detection algorithm used in a magnetic monitoring system of the hydrogenerator

Babic

Milić

Rakić

2017

IET Electric Power Applications

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“…In fact, the inception and development of insulation damages, such as void, crack, delamination, etc. are the primary factor in the deterioration of stator insulation of large generators [ 8 , 9 , 10 , 11 , 12 ]. With existing CM methods, it is difficult to detect the specific features of stator insulation damage, e.g., location, type, size, etc.…”

Section: Introductionmentioning

confidence: 99%

Damage Identification of Large Generator Stator Insulation Based on PZT Sensor Systems and Hybrid Features of Lamb Waves

2018

Sensors

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Large generators are the principal pieces of equipment in power systems, and their operation reliability critically depends on the stator insulation. Damages in stator insulation will gradually lead to the failure and breakdown of generator. Due to the advantages of Lamb waves in Structural health monitoring (SHM), in this study, a distributed piezoelectric (PZT) sensor system and hybrid features of the Lamb waves are introduced to identify stator insulation damage of large generator. A hierarchical probability damage-imaging (PDI) algorithm is proposed to tackle the material inhomogeneity and anisotropy of the stator insulation. The proposed method includes three steps: global detection using correlation coefficients, local detection using Time of flight (ToF) along with the amplitude of damage-scattered Lamb wave, and final images fusion. Wavelet Transform was used to extract the ToF of Lamb wave in terms of the time-frequency domain. Finite Element Modeling (FEM) simulation and experimental work were carried out to identify four typical stator insulation damages for validation, including inner void, inner delamination, puncture, and crack. Results show that the proposed method can precisely identify the location of stator insulation damage, and the reconstruction image can be used to identify the size of stator insulation damage.

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Analysis of Damage Expansion and Mechanical Strength in End Insulation for High-Power AC Motor with Initial Defects

Zhang,

Zhang

et al. 2024

Lecture Notes in Electrical Engineering

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Symptoms of Winding Insulation Aging After 37 Years of Service Life in a Hydrogenerator

Cited by 7 publications

References 13 publications

Fault detection algorithm used in a magnetic monitoring system of the hydrogenerator

Fault detection algorithm used in a magnetic monitoring system of the hydrogenerator

Damage Identification of Large Generator Stator Insulation Based on PZT Sensor Systems and Hybrid Features of Lamb Waves

Analysis of Damage Expansion and Mechanical Strength in End Insulation for High-Power AC Motor with Initial Defects

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