Audible Noise and High-Voltage Power Capacitors

Bandalo, Felix Srecko; Singh, Biswajit; Sevigny, R.

doi:10.1109/tpwrd.2017.2774506

Cited by 5 publications

(4 citation statements)

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“…Electric forces, as the excitation of mechanical vibration, cannot be directly measured from a power capacitor so most researchers have utilized the square of the voltage on a capacitor to characterize the electrical forces [6][7][8][9] based on the relation between the electric force F e and the terminal voltage u(t), as shown in Equation (1):…”

Section: Introductionmentioning

confidence: 99%

“…A black-box model was used to predict the sound pressure level of power capacitors. The black-box model consisted of several transfer functions used to describe the relation between the voltage applied on a capacitor and the vibration on surfaces [6][7][8] but the vibration inside the capacitor core could not be not provided. The transfer function method is used under the assumption of a linear time-invariant system, which may not be exact for a power capacitor.…”

Section: Introductionmentioning

confidence: 99%

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Vibration Model of a Power Capacitor Core under Various Harmonic Electrical Excitations

Lei

Zuo

et al. 2022

Energies

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Power capacitors are widely used in power transmission systems. During their operation, an electric force acting on the electrodes of the power capacitors actuates mechanical vibrations and radiates an audible noise. Considering a power capacitor as a general system, the frequency response with the electric force as the input and mechanical vibration as the output have been measured by engineers in recent years and used to evaluate the acoustic and mechanical features of products. Accidentally, it was found that the frequency of the capacitor vibration was not consistent with its excitation due to electro-mechanical coupling. This electro-mechanical coupling had not been considered in previous vibration models of power capacitors. Therefore, a new vibration model of power capacitors was built up in this paper and a so-called multi-frequency vibration characteristic was revealed. A theoretical analysis showed that the electric force and mechanical vibration of the power capacitors were coupled, which resulted in the multi-frequency vibration. The vibration frequency response was measured and the result was consistent with the vibration model proposed in this paper. Once the frequency of the electric force was near half the natural frequency of the power capacitor, a predominant multi-frequency vibration was triggered and the power capacitor was in a superharmonic resonance.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vibration Model of a Power Capacitor Core under Various Harmonic Electrical Excitations

Lei

Zuo

et al. 2022

Energies

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“…Increasing the power density of electrical passive components, such as a capacitor [1][2][3], inductor or resistor, incorporated into modern power systems, is a common technical goal for many power applications. Higher power density brings better material utilization, lower weight and lower equipment cost.…”

Section: Introductionmentioning

confidence: 99%

“…In Equation (1), ~ represents the angular frequency of the power supply, I m is the magnitude of the current through the capacitor C and R represents its ESR. As obvious from Equation (1), the energy loss starts to dominate at higher frequencies, therefore the high Q factor capacitors must be used to prevent any performance issues.…”

mentioning

confidence: 99%

Design and Construction of High-Quality Capacitor for High Frequency and Power Application

Zavrel¹,

Kindl²,

Kavalir³

et al. 2021

Komunikácie

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The paper proposes a design and construction of a special plated capacitor exhibiting very good high-frequency characteristics. The capacitor is designed to minimize the parasitic parameters like ESR (equivalent series resistance) and ESL (equivalent series inductance) and to be suitable for power industry applications. The paper describes the fabrication process and discusses technical issues related to technology of manufacturing and assembling. It also provides an experimental verification and the quality evaluation based on frequency characteristics compared to existing commercial high-quality capacitor.

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