Abstract
High-frequency transformers are the core components of power electronic transformers (PET), whose insulation is deeply threatened by high voltage (HV) and high frequency (HF). The partial discharge (PD) test is an effective method to assess an electrical insulation system. A PD measurement platform applying different frequencies was set up in this manuscript. PD signals were acquired with a high-frequency current transducer (HFCT). For improving the signal-to-noise (SNR) ratio of PD pulses, empirical mode decomposition (EMD) was used to increase the SNR by 4 dB. PD characteristic parameters such as partial discharge inception voltage (PDIV) and PD phase, number, and magnitude were all analyzed as frequency dependent. High frequency led to high PDIV and a smaller discharge phase region. PD number and magnitude were first up and then down as the frequency increased. As a result, a suitable frequency for evaluating the insulation of high-frequency transformers is proposed at 8 kHz according to this work.
Highlights
To establish a smart grid, it is necessary to accomplish electronic power conditioning and control of electric power production and distribution [1]
The more severe working conditions of high power, high voltage, and high frequency threaten the insulation of power electronic transformers (PET) [7]
As a core component of PET, high frequency (HF) transformers play a role in isolating and transmitting power, the insulation of which is important
Summary
To establish a smart grid, it is necessary to accomplish electronic power conditioning and control of electric power production and distribution [1]. In this trend, electronic-based power devices are migrating from the on/off control to a modern control, such as the direct control (DC) microgrid (DCMG) [2] and railway traction systems [3], etc. Power electronic transformers (PET), functioning as energy routers in the power grids at various voltage levels have gained widespread concern. Since PET is a combination of power electronics and high frequency (HF) transformers, it has a great capacity to convert electrical energy with different electrical characteristics and to make reactive power compensation for the system.
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