UHF PD Experiments on Real Power Transformer and its Frequency Characteristics Results

Fan, Haiming; Hu, Jinxin; H., Liu,; Yin, Yi; Danikas, M. G.

doi:10.48084/etasr.608

Cited by 5 publications

(6 citation statements)

References 24 publications

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“…As suggested in the above standards, an ultra-wide-band (UWB) system or a high-pass filter (HPF) could be used to eliminate source interference, such as ultra-high frequency (UHF) sensor. Some UHF application examples under conventional 50/60 Hz sine wave and PWM excitation are mentioned in [44,53]. This shows that the UHF sensor can be utilized not only for conventional PD detection but also for detecting PD under PWM conditions.…”

Section: ) Pd Detection Methodsmentioning

confidence: 99%

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Motor Winding Insulation Degradation Under Repetitive Voltage Pulses

Yang,

Phung

2024

IEEE Access

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Variable speed drives (VSDs) are widely utilized to control motors such as pumps, compressors, fans, etc. However, the endurance of motor winding insulation under repetitive voltage pulse excitation is weakened, resulting in premature failure and shortening the expected operating life. This article reviews the literature of investigations spanning the last two decades on the problem. Researchers have focused on different aspects to explain this from a particular angle. The precise mechanism is complicated as a number of interacting factors contribute to premature insulation failure. Insulation degradation in motors can be attributed to thermal, mechanical, chemical, and electrical stress. It seems that space charge accumulation and partial discharge (PD) are the two main influences; the former can exacerbate the electric stress distribution whilst the latter promotes insulation deterioration.

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Section: ) Pd Detection Methodsmentioning

confidence: 99%

“…These factors will interact together to change the electric field distribution. Hence, the PDIV is influenced by the space charge accumulation [53].…”

Section: Accmulation and Influence Of Space Chargementioning

confidence: 99%

Motor Winding Insulation Degradation Under Repetitive Voltage Pulses

Yang,

Phung

2024

IEEE Access

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“…A general theory of phase transformation using transformers to convert from m to n number of phases on a klimbed transformer is presented in [15][16][17]. In this paper the theory of phase transformation is presented by graphical approach using vectors and phasor diagrams of different phases.…”

Section: Methods and Principles Of Phase Conversionmentioning

confidence: 99%

A Novel Three Phase to Seven Phase Conversion Technique Using Transformer Winding Connections

Tabrez¹,

Sadhu²,

Iqbal³

2017

Eng. Technol. Appl. Sci. Res.

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This paper proposes a novel multiphase transformer connection scheme which converts three phase balanced AC input to seven phase balanced AC output. Generalized theory to convert a three phase utility supply into any number of phases is presented. Based on the proposed generalized principle, a three phase to seven phase power converting transformer design is presented with connection scheme, analysis and simulation and experimental results of the proposed three phase to seven phase conversion transformer. The proposed transformer in this paper is analyzed and compared with the connection scheme for seven phase available in the literature. The connection scheme is found to have higher power density, lower core area and lower core requirement as compared to the available connection scheme of the same rating. Impedance mismatching between different phases of the transformer is observed in the three phase to seven phase transformer available in the literature. As this mismatching introduces error in study of per phase equivalent circuit diagrams as well as imbalance in voltage and currents. The present design also addresses the impedance mismatching issue and reduces mismatching in the proposed transformer design. A prototype of the proposed system is developed and waveforms are presented. The proposed design is verified using simulation and validated using experimental approach.

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“…Wavelet decomposition was used to study PD signal detection using antennas (Fan et al 2016). Three designs of the antenna, namely Goubau, monopole and discone, were used in a PD experiment involving an actual power transformer.…”

Section: Uhf Antenna Reviewmentioning

confidence: 99%

“…For comparison, RF has a wider spectrum from low frequency (LF: 30 -300 kHz) up to extra high frequency (EHF: 30 -300 GHz). A question of which range of the RF spectrum is more desirable for PD detection was brought forward in (Fan et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Application of Ultra-High Frequency Antenna for Partial Discharge Detection in Oil-Filled Power Transformer: A Review

Mukhtaruddin,

Isa,

Ain

et al. 2020

ZJDSET

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Partial discharge (PD) is a phenomenon that may lead to dielectric breakdown and can provide important information for condition monitoring on electrical power equipment, in particular transformer. One of the methods is the detection of the electromagnetic (EM) wave signal emitted by PD. Although the frequency spectrum in E is very wide, this paper discusses the detection of EM only at ultra-high frequency (UHF). One of the detectors that can be used to detect EM is the antenna. There are a lot of antenna designs that have been proposed to detect the signal. The designs can be generally divided into two: PCB-based design and physical antenna design. An example of the latter is monopole. Some of the proposed antennas were left at the design stage while others went to be applied in actual PD experimentation. Discussion on the capabilities of these antennas can lead to the selection of a suitable antenna.

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UHF PD Experiments on Real Power Transformer and its Frequency Characteristics Results

Cited by 5 publications

References 24 publications

Motor Winding Insulation Degradation Under Repetitive Voltage Pulses

Motor Winding Insulation Degradation Under Repetitive Voltage Pulses

A Novel Three Phase to Seven Phase Conversion Technique Using Transformer Winding Connections

Application of Ultra-High Frequency Antenna for Partial Discharge Detection in Oil-Filled Power Transformer: A Review

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