Sensitivity check for UHF PD detection on power transformers

Meijer, S.; Gulski, Ε.; Smit, J.J.; Reijnders, H. F.

doi:10.1109/elinsl.2004.1380448

Cited by 16 publications

(7 citation statements)

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“…7. Meijer et al [21] carried out partial discharge studies in transformer using UHF technique and concluded that the technique be sensitive enough to detect PD of 25-30 pC. The characteristic variation in injected charge with increase in voltage could be due to transfer of charge to the walls of the chamber and the remnant charges present in the medium.…”

Section: Resultsmentioning

confidence: 97%

“…Jongen et al [20] carried out studies on partial discharge activity in transformer oil under AC voltages and concluded that phase-resolved UHF signals can help to classify the type of PD source. Meijer et al studied partial discharge activity in transformers using UHF technique and concluded that noise free phase-resolved partial discharge patterns could be obtained using the narrow band UHF technique [21].…”

Section: Introductionmentioning

confidence: 99%

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Partial discharge study in transformer oil due to particle movement under DC voltage using the UHF technique

Sarathi

Reid²,

Judd³

2008

Electric Power Systems Research

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Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Partial discharge study in transformer oil due to particle movement under DC voltage using the UHF technique

Sarathi

Reid²,

Judd³

2008

Electric Power Systems Research

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“…Ultra high frequency (UHF) technique has proved very effective for transformer partial discharge (PD) monitoring [1]. However, G. C. Stone et al argued that PD measuring results alone is probably not feasible to provide the remaining life of the insulation which is the concerning focus of the equipment owners [2].…”

Section: Introductionmentioning

confidence: 99%

“…However, G. C. Stone et al argued that PD measuring results alone is probably not feasible to provide the remaining life of the insulation which is the concerning focus of the equipment owners [2]. Due to the limitation of isolated monitoring mode, most systems [1], [3], measured PD alone. To overcome this difficulty, the effects of transformer operating states on the PD activities should be considered, such as load, oil temperature and oil flow velocity etc.…”

Section: Introductionmentioning

confidence: 99%

Online UHF PD Monitoring for Step-up Transformers of Hydropower Plant

Yuan¹,

Chuanli

Wei³

et al. 2011

2011 Third International Conference on Measuring Technology and Mechatronics Automation

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As we known, to evaluate and diagnosis the insulation faults of large-size power transformers, partial discharges (PDs) can be detected via ultra high frequency (UHF) technique. In this paper, an UHF PD online monitoring system was developed for large-size step-up transformers. The principle of UHF PD monitoring method was introduced., and the hardware structure and software key techniques in the system were described. In order to achieve the integrated PD monitoring and ensure the accuracy of PD analysis, the operating environments and operating conditions of the transformers have been acquired synchronously. Meanwhile, the correlative analysis of PDs with respect to operating conditions can be performed and the characteristics of PD activities with respect to relevant states can be studied. The association analysis of PDs is performed as follows: (a) periodical PDs caused by power frequency voltage under stable operating conditions; (b) stochastic PDs caused by transient over-voltages under unstable operating conditions.At present, the system has been applied into several large-size step-up transforms and achieved large mount of on-site monitoring results, and the reliability of PD analyzing results is verified by the analysis of the onsite data.

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“…Pulses of 45V were injected and from laboratory experiments on a 14 MVA it was shown that this represents a PD activity of about 30 pC [4]. The pulses were injected in one of the UHF sensors and then detected and measured on the three others.…”

Section: Propagation Matricesmentioning

confidence: 99%

Application of UHF Diagnostics to Detect PD During Power Transformer Acceptance Tests

Meijer

Agoris

Smit

et al.

Conference Record of the 2006 IEEE International Symposium on Electrical Insulation

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Different diagnostic techniques are currently available for on-line insulation condition assessment of power transformers. Amongst these techniques a relatively new technique for detecting partial discharges (PD) in the Ultra High Frequency range of the spectrum is also introduced. The UHF technique has been recently presented in the field of transformer diagnostics, and although it is under development it shows great potential for on-line detection, recognition and location of PD activity.This paper describes the practical application of the UHF technique on two new identical 90 MVA, 150 kV power transformers. Both transformers are equipped with four external UHF sensors. Initially, injection measurements were performed to investigate the effects experienced by UHF signals when propagating through the transformer. Moreover, software developed to model the propagation of UHF signals inside the transformer tank was tested in its application to these specific transformers.The results obtained during the both the induced voltage test, as well as during the PD acceptance test in the factory are described. The practical experiences related in this paper provide further insight into the application of UHF PD monitoring techniques to power transformers.

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Sensitivity check for UHF PD detection on power transformers

Cited by 16 publications

References 0 publications

Partial discharge study in transformer oil due to particle movement under DC voltage using the UHF technique

Partial discharge study in transformer oil due to particle movement under DC voltage using the UHF technique

Online UHF PD Monitoring for Step-up Transformers of Hydropower Plant

Application of UHF Diagnostics to Detect PD During Power Transformer Acceptance Tests

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