Ageing behaviour and temperature rise in end corona protection layer for high voltage machines subjected to converter-like voltages

Paulsson, Goran; Sahlén, F.; Mårtensson, Eva; Holmgren, B.; Virtanen, Juha

doi:10.23919/insucon.2017.8097180

Cited by 2 publications

(1 citation statement)

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“…Paulsson et al have reported that experimentally obtained temperature rise at the SG system under the superimposed waveform of the sinusoidal and the square waveforms (PWM-like waveform) was approximately considered as the summation of the temperature rise by the AC sinusoidal and the square waves [11]. However, the validation of the above hypothesis based on the heat generation principle at the SG system under the PWM was not reported.…”

Section: Introductionmentioning

confidence: 99%

Power Density and Temperature Rise Estimation at End-turn Stress Grading System of Large Rotating Machines under PWM Waveform

Umemoto

Nakamura

2021

IEEE Trans. Dielect. Electr. Insul.

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In this paper, the time-averaged power densities as well as the resulting temperature rise, on an end-turn stress grading (SG) system under PWM waveforms as functions of the carrier and the fundamental frequencies are systematically investigated by finite element method-based computations. A novel analytical approximation method to estimate the power densities and the temperature rises without time-consuming numerical computations are proposed. As a result, the maximum power density and the temperature rise increase nearly linearly with increasing fundamental and the carrier frequencies. It is suggested that power dissipations in the SG layer by the fundamental frequency component of a PWM waveform and those by the carrier frequency component can be clearly separated. Moreover, the estimated power densities and temperature rises based on the analytical approximations show reasonable agreement with the numerically computed ones, which indicates the validity of the proposed estimation method.

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Section: Introductionmentioning

confidence: 99%