Analysis of characteristics of rail transit stray current and saturation mechanism of current transformer
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Guoxing Wu
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Hongshun Liu
Abstract
The DC bias may affect the transient transfer characteristics of the current transformer (CT), threatening the correct action of the relay protection and the safe operation of the power system. Compared with the high voltage direct current (HVDC) transmission in the unipolar-earth loop operation mode and geomagnetically induced current (GIC), the amplitude of the stray current is smaller, and the randomness and fluctuation are larger and accompanied by sudden changes. Combining the characteristics of stray current and the CT equivalent model considering the eddy current loss of the iron core, the mechanism of local transient saturation under the influence of bias magnetization is explained, and the CT saturation phenomenon caused by stray current and its effect on line distance protection are simulated and analyzed. The research shows that the influence of low amplitude and high duration of stray current will make the magnetic flux of CT grow and affect the transmission of steady-state and transient-state so that the measurement impedance appears amplitude-phase shift, which leads to under-range rejection of distance protection.
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: None declared.
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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© 2023 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
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- An accurate method for parameter estimation of proton exchange membrane fuel cell using Dandelion optimizer
- DC ground fault monitoring method of electrical equipment in 110 kV smart substation based on improved rough set
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Artikel in diesem Heft
- Frontmatter
- Research Articles
- A condition evaluation ensemble for power metering HPLC units within complex data scenarios
- Improvement of power quality by using novel controller for hybrid renewable energy sources based microgrid
- Novel multilevel inverter topology with low switch count
- Economic analysis of HRES-based distributed generation for mitigation of power loss and voltage profile problem
- An accurate method for parameter estimation of proton exchange membrane fuel cell using Dandelion optimizer
- DC ground fault monitoring method of electrical equipment in 110 kV smart substation based on improved rough set
- Analysis of characteristics of rail transit stray current and saturation mechanism of current transformer
- Power quality enhancement using a novel SAPF control scheme employing high selectivity filter
- Optimal ranking-based charging station selection for electric vehicles
- PQ event identification in PV-wind based distribution network with variational mode decomposition and novel feature enabled random forest classifier
- A fuzzy-logic-based smart power management strategy for reliability enhancement of energy storage system in a hybrid AC-DC microgrid with EV charging station
