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| Content Provider | IET Digital Library |
|---|---|
| Author | Liu, Wei Pan, Yuanlin Wang, Yuxue Yin, Xianggen Wang, Zengchao Cao, Wenbin |
| Abstract | During the inrush period, multiple misoperation accidents of differential protection of transformers happened, which seriously threatened the safe and stable operation of power grid. In the traditional malfunction analysis, only the inrush current process is considered, and the electromagnetic transient interaction between the transformer and other non-linear ferromagnetic components such as CT is hardly considered. Here, the variation rule of inrush current waveform characteristic is analysed, and the influence rule of secondary load and type of CT on inrush current second harmonic proportion and dead angle is simulated by using the simulation Lucas model of industrial practical CT (P/PR). The results show that the second harmonic proportion of the inrush current and the dead angle of the waveform depend on the saturation angle of the transformer core. The larger the saturation angle is, the smaller the second harmonic proportion is, and the larger the dead angle of the waveform is. The second harmonic proportion of the inrush current becomes larger, and the dead angle of sympathetic inrush becomes smaller after CT transfer. The dead angle of magnetising inrush waveform depends on the secondary load resistance. It may increase or decrease.. |
| Starting Page | 3062 |
| Ending Page | 3066 |
| Page Count | 5 |
| Volume Number | 2019 |
| e-ISSN | 20513305 |
| Issue Number | Issue 16, Mar (2019) |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/joe/conferences/cn-adc-2018 |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/joe.2018.8441 |
| Journal | The Journal of Engineering |
| Publisher | The Institution of Engineering and Technology |
| Publisher Date | 2018-10-29 |
| Access Restriction | Open |
| Rights License | Creative Commons Attribution-No Derivs License (http://creativecommons.org/licenses/by-nd/3.0/) |
| Subject Keyword | Adjacent Transmission Line CT Transfer CT Transient Characteristic Current Transformers Differential Protection Electromagnetic Transient Interaction Ferromagnetic Material Industrial Practical CT Inrush Current Second Harmonic Proportion Inrush Transfer Period Malfunction Analysis Multiple Misoperation Accidents Multiple Nonlinear Ferromagnetic Component P-PR Power Component Power Grid Power Transformer Protection Simulation Lucas Model Transformer And Reactors Transformer Core Transformer Cores Transformer Transient Inrush Current Process |
| Content Type | Text |
| Resource Type | Article |
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