Inrush Blocking Scheme in Transformer Differential Protection

Balamurugan, Saravanan; Aravindhan, R.

doi:10.1016/j.egypro.2017.05.242

Cited by 15 publications

(3 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 18 shows the results of detailed analyses of nonsinusoidal primary delta winding currents in no-load steady state. Qualitative analyses can also be freely extended to the selected fragments of the dynamic current and voltage waveforms where, e.g., the dominant harmonic component might be verified [12,39,40]. The exemplary results of analyses performed for the first period of the transient delta winding current of the center column are presented in Figure 19 and shown in Table 2; the participation of the second harmonic [6,26] may be observed here.…”

Section: Steady-state Assessmentmentioning

confidence: 97%

Practical Experiments with a Ready-Made Strategy for Energizing a Suitable Pre-Magnetized Three-Column Three-Phase Dy Transformer in Unloaded State for Inrush Current Computations

Łukaniszyn,

Majka,

Baron

et al. 2024

Energies

View full text Add to dashboard Cite

This article presents the results of an experimental verification of three-phase Dy transformer dynamics under no-load conditions. This study is motivated by previous ferroresonance analyses where the occurrence of inrush currents has been observed. The measurements covered all available electrical quantities in a transient state (12 measured and 3 additionally computed waveforms) during the device’s start-up under no-load conditions, as well as in a long-term steady state. A detailed analytical analysis is carried out for the obtained comprehensive set of measurement results. As a result of the conducted research, the mathematical model of the pre-magnetized three-phase Dy transformer is modified. Particular attention is paid to the issue of residual magnetism of the transformer core and its consideration in further research. The original strategy for energizing a three-column three-phase Dy transformer with a suitable pre-magnetization of its columns and original control switching system with a given/set value of the initial phase in the supply voltage is put to the test. The evolution of the induced inrush phenomenon up to the quasi-steady state under given (forced) conditions is documented (currents, voltages and the dynamics of changes taking place in the core (hysteresis loops)). This article represents a continuation of ongoing work on the study of transient states (dynamics of transformer inrush currents). At present, the Dy three-phase transformer is analyzed because of the requirements of industrial operators.

show abstract

Section: Steady-state Assessmentmentioning

confidence: 97%

Practical Experiments with a Ready-Made Strategy for Energizing a Suitable Pre-Magnetized Three-Column Three-Phase Dy Transformer in Unloaded State for Inrush Current Computations

Łukaniszyn,

Majka,

Baron

et al. 2024

Energies

View full text Add to dashboard Cite

show abstract

“…Inrush magnetizing currents (startup currents) in transformers are an important influence that increases the risk of incorrect operation of DFRs. The distinction of these currents from actual fault currents can be achieved by comparing the two current behaviors in terms of phase angles [73], [74]. In addition, analysis of the primary and secondary currents, the transformer end voltage and the voltage values at the load ends is also necessary to make the distinction between internal and external faults more accurate.…”

Section: Zubic Et Al Presented a New Dr Algorithm Based On Maximum Overlap Discrete Wavelet Transform (Modwt)mentioning

confidence: 99%

Trends in Power System Protection Researches: A Review of Fundamental Relays

Onat

2018

Balkan Journal of Electrical and Computer Engineering

View full text Add to dashboard Cite

Power system protection is one of the main element of modern energy management concept. The main task of these systems is to deactivate the faulty element or network part as soon as possible. The protection relays, called intelligent electronic devices, also have different functions than these basic functions. However, overcurrent, distance and differential protection are still used as the three basic components. In this study, current studies on these relays for coordination of the protection system have been analyzed. The research topic is limited to the main functions of the relays. Further study will examine the tasks that these relays have in providing data to the energy management system. It can also focus on the concept of wide area protection, event recording and modern communication protocols.

show abstract

“…(1) Signal analysis using time-frequency analysis such as wavelet transform, s-transform, and Huang-Hilbert transform [4][5][6][7][8][9][10] (2) Classification algorithms and learning machines such as artificial neural networks and tree-based algorithms…”

Section: Introductionmentioning

confidence: 99%

Identification of Power Transformer Currents by Using Random Forest and Boosting Techniques

Khatib

Arar

2020

Mathematical Problems in Engineering

View full text Add to dashboard Cite

In this research, a differential protection technique for a power transformer is proposed by using random forest and boosting learning machines. The proposed learning machines aim to provide a protection expert system that distinguishes between different transformer status which are normal, inrush, overexcitation, CT saturation, or internal fault. Data for 20 different transformers with 5 operating cases are used in this research. The utilized random forest and boosting techniques are trained using these data. Meanwhile, the proposed models are validated by other measures such as out-of-bag error and confusion matrix. In addition, variable importance analysis that shows signal’s component importance inside a transformer at different instances is provided. According to the result, the proposed random forest model successfully identifies all of the current cases (100% accuracy for the conducted experiment). Meanwhile, it is found that it is less accurate as a conditional monitoring element with accuracy in the range of 97%–98%. On the other hand, the proposed boosting model identifies all of the currents for both cases (100% accuracy for the conducted experiment). In addition to that, a comparison is conducted between the proposed models and other AI-based models. Based on this comparison, the proposed boosting model is the simplest and the most accurate model as compared to other models.

show abstract

Inrush Blocking Scheme in Transformer Differential Protection

Cited by 15 publications

References 10 publications

Practical Experiments with a Ready-Made Strategy for Energizing a Suitable Pre-Magnetized Three-Column Three-Phase Dy Transformer in Unloaded State for Inrush Current Computations

Practical Experiments with a Ready-Made Strategy for Energizing a Suitable Pre-Magnetized Three-Column Three-Phase Dy Transformer in Unloaded State for Inrush Current Computations

Trends in Power System Protection Researches: A Review of Fundamental Relays

Identification of Power Transformer Currents by Using Random Forest and Boosting Techniques

Contact Info

Product

Resources

About