Assessment of Cable Length Limit for Effective Protection by Z-Source Circuit Breakers in DC Power Networks

Fu, Ruiyun; Bhatta, Sagar; Keller, Joseph M.; Zhang, Yucheng

doi:10.3390/electronics10020183

Cited by 5 publications

(3 citation statements)

References 28 publications

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“…The current‐limiting reactor (CLR) is currently the most used and practical method for limiting the fault current, since it has excellent fault current limiting performance, simple structure and low implementation cost [21]. However, since the CLRs enlarge the inductance of the fault loop, the fault current clearance time and the dissipated energy of the DCCB are significantly increased [22,23]. This will lead to the delayed recovery of the healthy network and increased heat dissipation of the equipment.…”

Section: Introductionmentioning

confidence: 99%

Multiline Fault Current Limiter for DC Line Fault in Multi‐terminal DC Grids

Han

Qin

Zhao

et al. 2023

IEEJ Transactions Elec Engng

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The current-limiting reactor is currently the most used fault current limiting technique to ensure the fault ride-through of the multi-terminal dc grid. However, its configuration will significantly prolong the fault current clearance time and increase the dissipated energy of dc circuit breakers. Therefore, this paper proposes a cost-effective multiline fault current limiter for multiport application in multi-terminal dc grids, which can effectively limit the rising speed of fault current through the integrated currentlimiting reactors without time delay and significantly reduce their negative impacts on the performance of dc circuit breakers by bypassing the current-limiting reactors through the solid-state switch units during the fault current interruption process. The topology and operation process of the multiline fault current limiter are introduced at first. Then, the economic comparison of the proposed device with the existing solutions is presented. Finally, the feasibility and superiorities of the proposed device are verified by extensive simulations and scaled-down experiments.

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Section: Introductionmentioning

confidence: 99%

Multiline Fault Current Limiter for DC Line Fault in Multi‐terminal DC Grids

Han

Qin

Zhao

et al. 2023

IEEJ Transactions Elec Engng

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“…Yang, W et al analyzed the effect of pressure, relative humidity, and temperature difference on MCB according to altitude through simulation [6]. In addition, various studies on LV or MV breakers are being conducted, and in particular, studies related to the DC system are increasing [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Short-Circuit and Dielectric Recovery Characteristics of Molded Case Circuit Breaker according to External Environment

et al. 2022

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A molded case circuit breaker (MCCB) is one of the most important factors for safety to protect a load from overcurrent in a power distribution system. MCCB, which is mainly installed in switchboards and distribution boxes, may be affected by external temperatures and magnetic fields, but the above factors are still excluded from product standards and performance evaluation. This paper is the result of experimenting and studying the negative effects of these external temperatures and external magnetic fields on MCCB with short-circuit characteristic and dielectric recovery strength. As a result of temperature, it can be found that both short-circuit characteristic and dielectric recovery strength change linearly in accordance with the external temperature. The ratio of the values of 35 °C to 25 °C and 45 °C to 25 °C show the following results. t10, t21, and t32 are 1.58, 1.53, and 1.79, respectively, in short-circuit characteristics and ti, tm, and tl are 1.59, 1.69, and 1.53, respectively, in dielectric recovery strength. Depending on the external magnetic field, the short-circuit characteristics decreased by 8.56% only in the t21 period. The dielectric recovery strength decreases by 4.92% in the initial section (ti) and 14.45% in the later section (tl), respectively. It has been confirmed that the external magnetic field interferes with the emission of hot gas.

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“…Particularly, in the case of DC distribution products where the electrical resistance is more fragile than that of the AC distribution products, it is necessary to interrupt the inflow of over-current more quickly. Therefore, various studies are being conducted to improve performance, such as introducing a new structure to improve the performance of existing breakers [4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Characteristics of Low Voltage Circuit Breaker by External Magnetic Field

et al. 2022

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Recently, as interest in eco-friendly distributed power has increased, studies on the improvement of the performance of breakers such as DC breakers and on the reliability of existing AC breakers have been actively conducted. To improve the performance and reliability of these breakers, this paper conducted the analysis of characteristics of a low voltage circuit breaker using an external magnetic field. In this experiment, before the current-zero point, the cut-off time to improve the breaker performance is shortened and after the current-zero point, re-ignition, which is associated with reliability, is suppressed. According to the experimental results, the short-circuit characteristics before current-zero show a significant difference of 0.13 ms in the t21 section, and the dielectric recovery strength after current-zero shows a 13.3% performance improvement in the latter half of the DRV (dielectric recovery voltage) V-t curve. This result has significant meaning because it can be easily improved under the control of the external magnetic field. Hence, it can be applied to the interruption performance improvement of breakers through detailed research in the future.

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Assessment of Cable Length Limit for Effective Protection by Z-Source Circuit Breakers in DC Power Networks

Cited by 5 publications

References 28 publications

Multiline Fault Current Limiter for DC Line Fault in Multi‐terminal DC Grids

Multiline Fault Current Limiter for DC Line Fault in Multi‐terminal DC Grids

Analysis of Short-Circuit and Dielectric Recovery Characteristics of Molded Case Circuit Breaker according to External Environment

Analysis of Characteristics of Low Voltage Circuit Breaker by External Magnetic Field

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