An Inrush Current Suppression Strategy for UHV Converter Transformer Based on Simulation of Magnetic Bias

Han, Pingping; Tong, Qingyang; Wang, Yan; Chen, Zhong; Yang, Wei; Hu, Di; Wu, Hongbin; Zhang, Jingjing

doi:10.1109/tpwrd.2022.3173431

Cited by 6 publications

(1 citation statement)

References 9 publications

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“…From the aforementioned analysis, it can be observed that by changing the closing angle, the closing overcurrent multiplier can be reduced, and when the closing angle is 90 °, the closing overcurrent multiplier reaches the minimum, but the harmonic distortion rate increases. However, the method of changing the closing angle can only reduce the overcurrent multiplier of one or two phases because the essence of changing the closing angle is equivalent to shifting the threephase voltage and current by an angle, and the calculation results also show that when the closing overcurrent multiplier of phase A decreases, the closing overcurrent multiplier of phases B and C Series closing resistance method Hang et al (2022) proposed a method to reduce the overcurrent multiplier by connecting the closing resistors in series. Therefore, some simulations were carried out by stringing in resistors of different resistance values in the simulation platform, and the results are shown in Table 6.…”

Section: Adjustment Of the Closing Angle Methodsmentioning

confidence: 99%

Transient characteristics of mobile transformer vehicle bypass operation

Zhou

Xing

Chen³

et al. 2023

Front. Energy Res.

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The bypass operation method of mobile transformer vehicles is a common method for the maintenance or replacement of transformers in distribution lines. Using the bypass operation method could avoid power outages and ensure the reliability of electricity consumption. However, the transient characteristics of mobile transformer vehicles connected to the grid can have an impact on their power quality. In response to this problem, this study built a model based on MATLAB/Simulink to model the process of grid connection. The simulation analyzed the current and voltage waveforms of the transient process of grid connection. Moreover, a combination of time-domain and frequency-domain analysis was used to analyze the transient overvoltage and overcurrent conditions of the grid connection. Finally, the effects of two overcurrent suppression methods, adjustment of the closing angle method and the series closing resistance method, were analyzed. These studies provide theoretical guidance for engineering applications, which could strengthen the stability of the distribution network.

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Section: Adjustment Of the Closing Angle Methodsmentioning

confidence: 99%

Transient characteristics of mobile transformer vehicle bypass operation

Zhou

Xing

Chen³

et al. 2023

Front. Energy Res.

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A robust approach to transformer fault diagnosis: integrating time-current loci analysis with statistical feature extraction

Shanu,

Mishra

2024

Eng. Res. Express

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The accurate identification of inrush currents and inter-turn faults in power transformers is crucial for maintaining the stability and safety of electrical power systems. Traditional methods often struggle to distinguish between these phenomena due to their overlapping characteristics.This paper introduces an innovative approach utilizing the time-current loci (TIL) method to effectively differentiate between normal operating conditions, inrush currents, and inter-turn faults. By plotting time against current over one cycle, distinct loci patterns emerge for each condition, offering a robust visual and analytical basis for classification. The methodology involves detailed extraction and analysis of key statistical features from the plotted loci.Initially, the rate of change in time and current are derived using which the orientation of theTIL curve is analyzed. Features like the mean of orientation and skewness of orientation are computed to capture the unique geometric properties of each condition's loci thereby, enhancing classification accuracy. Experimental validation was conducted using a series of controlled tests on 1kVA, 230V / 230 V transformer under different operating conditions. The results indicated that the time-current loci method could reliably distinguish between normal conditions, inrush currents, and interturn faults. The proposed method offers several advantages over conventional techniques. It eliminates the need for complex machine learning algorithms, relying instead on straightforward geometric and statistical analysis, making it easier to implement in real-time systems. Moreover, the visual nature of the loci plots provides an intuitive understanding of transformer behavior, aiding operators in quick decision-making.

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Countermeasure to Prevent Transformer Differential Protection From False Operations

et al. 2023

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The reliability of the transformer differential protection is under threat from multiple interferences, including the inrush condition, the current transformer saturation condition, and the arc fault condition. For improvement, a new method is proposed to discriminate fault conditions and other non-fault conditions. Firstly, the proposed method identifies the unidirectional inrush via unidirectional index, since only it exhibits unidirectional characteristic. Then, the remaining signals are classified by the quartering-based similarity index. The quartering-based similarity index is obtained by quartering segmented fitting to overcome the drawback of overall fitting. Simulation results indicate that the proposed method is able to effectively avoid misjudgments caused by aforementioned interferences. Actual experimental tests, field data tests, and comparison analyses demonstrate its engineering adaptability and superiority.

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An Inrush Current Suppression Strategy for UHV Converter Transformer Based on Simulation of Magnetic Bias

Cited by 6 publications

References 9 publications

Transient characteristics of mobile transformer vehicle bypass operation

Transient characteristics of mobile transformer vehicle bypass operation

A robust approach to transformer fault diagnosis: integrating time-current loci analysis with statistical feature extraction

Countermeasure to Prevent Transformer Differential Protection From False Operations

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