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| Content Provider | IET Digital Library |
|---|---|
| Author | Nielsen, Shawn D. Walker, Geoffrey R. |
| Abstract | This study presents a switch-mode assisted linear amplifier (SMALA) designed for use as a frequency-domain spectroscopy (FDS) excitation voltage source for the diagnostic testing of oil/paper insulation systems in large power transformers. The developed voltage source has a low output voltage noise level and low harmonic content and is capable of driving highly capacitive loads with a maximum output voltage of 800 Vp-p in the frequency range of DC to 100 Hz and current limited to 20 mA. Disturbances in the output voltage associated with switching of the main switching amplifier are minimised through the control of the switching time, taking the slew rate of the correction amplifier into account. The switching time of the main switching amplifier can be effectively controlled using a combination of a simple RC filter on the output of the main switching amplifier and controlling the rise-time and fall-time of the MOSFET gate drive voltage. Using the developed SMALA unit, it was possible to perform FDS measurement on an oil/paper-insulated transformer at an elevated excitation voltage. This resulted in a non-linear response current, manifesting as odd harmonics in the measured current. |
| Starting Page | 4446 |
| Ending Page | 4451 |
| Page Count | 6 |
| Volume Number | 2019 |
| e-ISSN | 20513305 |
| Issue Number | Issue 17, Jun (2019) |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/joe/2019/17 |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/joe.2018.8121 |
| Journal | The Journal of Engineering |
| Publisher | The Institution of Engineering and Technology |
| Publisher Date | 2019-01-22 |
| Access Restriction | Open |
| Rights License | Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/) |
| Subject Keyword | Amplifiers Correction Amplifier Current 20.0 MA Developed Voltage Source Dielectric Low Frequency-domain Spectroscopy Measurement Elevated Excitation Voltage Frequency 100.0 Hz Frequency-domain Spectroscopy Excitation Voltage Source High-voltage Switch-mode Assisted Linear Amplifier Based Voltage Source Insulated Gate Field Effect Transistors Low Harmonic Content Low Output Voltage Noise Level Main Switching Amplifier Maximum Output Voltage MOSFET MOSFET Gate Drive Voltage Oil/paper Insulation System Oil/paper-insulated Transformer Organic Insulation Paper Power Amplifier Power Converter Power Supplies to Apparatus Power Transformer Power Transformer Insulation Switching Converter Switching Time Transformer And Reactors Transformer Oil |
| Content Type | Text |
| Resource Type | Article |
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