A hybrid circuit breaker based on current commutation approach for multi feeders DC railway substations

Hasan, S.

doi:10.17775/cseejpes.2017.00290

Cited by 10 publications

(3 citation statements)

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“…However, this criterion is limited because it was studied by applying only mean time to failure and failure mode, effects, and criticality analysis methods according to the probability and statistical failure rate [8]. As it turns out, there are no ongoing studies that can analyze degradation from the engineering aspect based on the use environment of circuit breakers and suggest replacement cycles through life evaluation [9]- [11].…”

Section: Introductionmentioning

confidence: 99%

Insulation Resistance and Tracking Index of Circuit Breaker According to the Accelerated Aging Test

Kang,

Kim

2023

IEEE Access

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This study examined insulation resistance and tracking index characteristics through the accelerated aging test of low-voltage circuit breakers. The leakage current was found to be influenced by external factors rather than the internal structure. Additionally, the insulation resistance of the circuit breakers undergoing accelerated degradation was measured using a Megger insulation tester. In the case of a circuit breaker manufactured using the accelerated aging test, the insulation resistance increased compared to that of a circuit breaker under normal conditions. However, the insulation resistance of aged circuit breakers collected from various regions of Korea exhibited a decrease in correlation with their equivalent lifetimes. The tracking test of the circuit breaker was conducted in accordance with IEC 60112. In the case of a circuit breaker under normal conditions, tracking did not occur even at an applied voltage of 400 V. Furthermore, no tracking was observed in the circuit breaker manufactured through the accelerated aging test. However, for the aged circuit breakers collected from various regions in Korea, tracking occurred even at an applied voltage of 125 V. Consequently, upon analyzing the circuit breaker components in relation to degradation, it was observed that, as degradation advanced, certain components were lost, and in the case of aged circuit breakers, the characteristics of the insulator were also compromised.

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Section: Introductionmentioning

confidence: 99%

Insulation Resistance and Tracking Index of Circuit Breaker According to the Accelerated Aging Test

Kang,

Kim

2023

IEEE Access

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“…For DC circuit breaker, the problems in electromagnetic transient process and electrical stress are mainly concerned [13,14]. X. Cui and others analysed the mechanism of differential mode interference in the HCB power supply system, established the broadband equivalent circuit model of the power supply system, and proposed the suppression measures [15].…”

Section: Introductionmentioning

confidence: 99%

Analysis for magnetic field disturbance of hybrid DC circuit breaker during breaking

Shen

et al. 2021

High Voltage

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The high current of hybrid DC circuit breaker (HCB) in the process of breaking generates strong transient magnetic field (MF), which may interfere with the normal operation of driver control units (DCUs). Therefore, the analysis for transient MF disturbance is of great significance. Due to the large space scale of HCB, with the large number of power electronic devices, the numerical calculation method has the disadvantages of large consumption of resources and slow calculation speed in solving the transient MF inside the HCB. In this study, the current generation mechanism of a 500 kV HCB is analysed, and the equivalent current path is obtained by considering the skin effect. Combined with the temporal and spatial distribution of transient current, the multi-process transient equivalent model of transient MF calculation is established, and the model has the advantages of high precision and high speed. Then, the breaking experiment of HCB is carried out, and the transient MF near the DCU is measured. The experiment results verify the validity of the model. Furthermore, the disturbance of transient MF at the DCU of the transfer branch during breaking 25 kA current is analysed.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…The intelligent air circuit breaker (ACB) and molded case circuit breaker (MCCB) (used as master protection switch and slave protection switch, respectively) [2][3][4][5][6][7][8][9][10] were commercialized (e.g., ABB Emax 2 series and Tmax T series). Although miniature circuit breakers (MCBs) are required to protect most of the terminal electrical equipment in the power grid [11], the commercialization of an intelligent MCB is constrained by its operating principle.…”

Section: Introductionmentioning

confidence: 99%

An electrothermal current prediction method for overload protection of miniature circuit breakers

Lyu¹,

Zong²

2020

Turk J Elec Eng & Comp Sci

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Traditional miniature circuit breakers (MCBs) cannot meet the requirement for the intelligence of distributing apparatuses in a smart grid. The intellectualization of MCBs is restricted due to the lack of appropriate current measurement methods. Thus, an electrothermal current prediction method is proposed based on the derived relationship between root-mean-square (RMS) current and steady-state temperature rise. A fast acquisition algorithm is used to obtain the required temperature rise before thermal equilibrium to highly reduce the total time consumption. The presented prediction method is found immunized against the ambient temperature. The theory is validated with experiments using a thermostat. The tested steady-state accuracy and transient performance could meet the overload protection requirements without being affected by the environmental temperature.

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A hybrid circuit breaker based on current commutation approach for multi feeders DC railway substations

Cited by 10 publications

References 0 publications

Insulation Resistance and Tracking Index of Circuit Breaker According to the Accelerated Aging Test

Insulation Resistance and Tracking Index of Circuit Breaker According to the Accelerated Aging Test

Analysis for magnetic field disturbance of hybrid DC circuit breaker during breaking

An electrothermal current prediction method for overload protection of miniature circuit breakers

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