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| Content Provider | IET Digital Library |
|---|---|
| Author | Cheng, Yangchun Bi, Jiangang Chang, Wenzhi Xu, Yuan Pan, Xiaohua Ma, Xianwei Chang, Shuai |
| Abstract | Frequency response analysis is widely used as a method for the offline diagnosis of winding deformations in power transformers. To apply it to a working transformer, people need to determine how to inject the excitation signal and measure the response signal for windings that bear a rated voltage and current. In this study, a method to obtain the frequency response curve online is proposed. It uses the principle of magnetic field coupling to inject a frequency sweep signal into the windings through a Rogowski coil. Another Rogowski coil sensor placed at the root of a high-voltage bushing is used to measure the response current signal. Experiments on a 72.5 kV bushing show that metal accessories of the bushing have no influence on the injection or the measurement. The feasibility of this method was verified by experiments on charged 110/35/10 kV transformers at a factory and a working 35 kV transformer in a power station. The results show that it is safe to install the Rogowski coil at the root of the high-voltage bushing. The excitation signal can be injected into live windings and the response signal is measurable. Strong electromagnetic power frequency noise can be reduced and the frequency response curve can be measured online. |
| Starting Page | 343 |
| Ending Page | 349 |
| Page Count | 7 |
| Volume Number | 5 |
| e-ISSN | 23977264 |
| Issue Number | Issue 3, Jun (2020) |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/hve/5/3 |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/hve.2019.0134 |
| Journal | High Voltage |
| Publisher | The Institution of Engineering and Technology CEPRI |
| Publisher Date | 2019-11-29 |
| Access Restriction | Open |
| Rights License | Creative Commons Attribution-Non Commercial-No Derivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/) |
| Subject Keyword | Bushings Coils Deformation Excitation Signal Frequency Response Frequency Sweep Signal High-voltage Bushing Magnetic Coupling Magnetic Field Coupling Measurement of Mechanical Variables Mechanical Variables Measurement Online Frequency Response Curve Online Analysis Power Station Power Transformer Response Current Signal Measurement Response Signal Rogowski Coil Sensor Sensing And Detecting Device Sensing Device And Transducers Sensor Strong Electromagnetic Power Frequency Noise Transformer And Reactors Transformer Windings Voltage 10.0 KV Voltage 110.0 KV Voltage 35.0 KV Voltage 72.5 KV Winding Deformation Detection |
| Content Type | Text |
| Resource Type | Article |
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