Voltage Distribution in the Stator Windings of High Voltage Motors Fed by PWM Drives Part I: Effects of the Pulse Characteristics

Moghadam, Davoud Esmaeil; Speck, Joachim; Großmann, S.; Stähl, Jutta

doi:10.1109/icd.2018.8514776

Cited by 4 publications

(4 citation statements)

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“…The experiment results on a real prototype are in high accordance with that of simulation. Moghadam conducts experiments on interturn voltage within a single coil of a motor under different electrical parameters [16]. The author finds that besides shorter rise time, the longer pulse width can also bring a stronger interturn voltage drop, leading to a more serious electrical stress on the coil's insulation.…”

Section: Introductionmentioning

confidence: 99%

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Electrical Stress on the Medium Voltage Medium Frequency Transformer

et al. 2021

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This paper proposes an equivalent circuit model to obtain the transient electrical stress quantitatively in medium voltage medium frequency transformers in modern power electronics. To verify this model, transient simulation is performed on a 1.5 kV/1 kHz transformer, revealing voltage overshoot quantitatively between turns and layers of the transformer’s HV winding. Effects of rise time of the input pulse voltage, stray capacitance of the winding insulation, and their interactions on the voltage overshot magnitude are presented. With these results, we propose limiting the voltage overshoot and, thereafter, enhancing medium voltage medium frequency transformer’s insulation capability, which throws light on the transformer’s insulation design. Additionally, guidance on the future studies on aging and endurance lifetime of the medium voltage medium frequency transformer’s insulation could be given.

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Section: Introductionmentioning

confidence: 99%

“…[ [13][14][15][16] • Reveal the interturn and inter-coil overvoltage within the winding of inverter-fed motors.…”

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confidence: 99%

Electrical Stress on the Medium Voltage Medium Frequency Transformer

et al. 2021

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“…With these stray parameters, electric circuit model can be built in software for circuit analysis, which enables the simulation of the waveform for interturn voltage drop in time domain [12,[59][60]. For some of the HV motor, the dimension of the winding is large enough that a probe can be used for directly testing the inter-layer or inter-winding section voltage drop [61][62]. The results of these papers show that if pulse voltage is added to the winding, inter-turn overvoltage exists, and this overvoltage would be highest between turns closest to the winding terminals.…”

Section: Project Motivationsmentioning

confidence: 99%

“…Unlike the PD and endurance tests on the samples such as insulation film or electromagnet wires, the transformer's winding structure is not the same as that of the motor. Therefore, the conclusions from [12,[59][60][61][62] cannot be directly applied in the field of medium frequency transformer. Similar studies focusing on the electric stress suffered by MVMF transformer's winding in transient time domain is necessary.…”

Section: Project Motivationsmentioning

confidence: 99%

Electric Stress and Insulation Failure Mechanism of Medium Voltage Medium Frequency Transformer

Zheng

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