A Novel Low Voltage Selective Circuit Breaker with Additional Current Path

The subject of the article is a description of the operating principle of the new proposal of the selective circuit breaker, which is an extension of the existing selective devices. The solution proposed in the article allows one to increase the selectivity range of classic selective circuit breakers. In the case of networks with high values of short-circuit loop impedance, operating at reduced supply voltage, the proposed solution will not limit the short-circuit current too excessively as it is in the case of classic solutions. This advantage will allow for the correct reaction of the protections preceding them. The article presents the structure and analysis of the selection of parameters of the proposed solution. The results of simulation calculations have also been illustrated.

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Bidirectional Short-Circuit Current Blocker for DC Microgrid Based on Solid-State Circuit Breaker

Electronics ◽

10.3390/electronics9020306 ◽

2020 ◽

Vol 9 (2) ◽

pp. 306 ◽

Cited By ~ 27

Author(s):

Lujun Wang ◽

Boyu Feng ◽

Yu Wang ◽

Tiezhou Wu ◽

Huipin Lin

Keyword(s):

Solid State ◽

Low Voltage ◽

Short Circuit ◽

Circuit Breaker ◽

Short Circuit Current ◽

Rotational Inertia ◽

Dc Microgrid ◽

Protection Strategy ◽

Solid State Circuit ◽

Solid State Circuit Breaker

In order to solve the imminent problem in that the traditional protection strategy cannot meet time requirements, together with the fact that the rotational inertia of a DC microgrid is small and short-circuit fault develops rapidly, a bidirectional short-circuit current blocker (BSCCB) based on solid-state circuit breaker for a DC microgrid is proposed. Firstly, the bidirectional current blocking circuit structure is proposed based on the analysis of key components. Then, a top-level differential protection strategy is developed based on the aforementioned proposal. Finally, the performance of the blocking circuit is simulated and verified by experiments. The results show that the proposed method can block short-circuit current within 4 ms, and the response speed of the protection strategy is very fast compared with previous approaches. BSCCB also has reclosing, bidirectional blocking and energy releasing functions. The current blocker proposed in this paper can be reused multiple times and has a promising future in low-voltage DC microgrid application.

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Fault Diagnosis Algorithm and Protection of Electric Power Systems in an Alternative Distribution System

Journal La Multiapp ◽

10.37899/journallamultiapp.v1i3.192 ◽

2020 ◽

Vol 1 (3) ◽

pp. 8-16

Author(s):

Oshin Ola Austin ◽

Oluwasanmi Alonge ◽

Ajayi Joseph Adeniyi

Keyword(s):

Power Systems ◽

Distribution System ◽

Short Circuit ◽

Circuit Breaker ◽

Research Work ◽

Short Circuit Current ◽

Phase System ◽

Fault Current ◽

Circuit Breakers ◽

Protective Devices

In any power systems, protective devices will detect fault conditions and operate circuit breakers in order to disconnect the load from the fault current and limit loss of service due to failure. This fault may involve one or more phases and the ground, or may occur between two or more phases in a three-phase systems. In ground, fault’ or ‘earth fault, current flows into the earth. In a poly-phase system, a fault may affect each of the three phases equally which is a symmetrical fault. If only some phases are affected, the resulting ‘asymmetrical fault’ becomes more complicated to analyze due to the simplifying assumption of equal current magnitude in all the phases being no longer applicable. Therefore, the prospective short circuit current of the fault can be calculated for power systems analysis procedures. This will assist in the choice of protective devices like circuit breakers, current transformers and relays. This research work evaluated and analyzed the occurrence of faults in a distribution system. Fault currents were obtained and the maximum tripping time required for the protective devices to operate were determined. Hence, it was possible to select appropriate relay and circuit breaker for effective operation of a distribution

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Automated Computation of Short-Circuit Current Components and Selection of High-Voltage Circuit Breakers of Substation Switchgear CAD

Bulletin of the South Ural State University series Power Engineering ◽

10.14529/power200105 ◽

2020 ◽

Vol 20 (1) ◽

pp. 38-46 ◽

Cited By ~ 1

Keyword(s):

High Voltage ◽

Short Circuit ◽

Short Circuit Current ◽

Circuit Breakers ◽

Selection Of

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A Digital-Controlled SiC-Based Solid State Circuit Breaker with Soft Switch-Off Method for DC Power System

Electronics ◽

10.3390/electronics8080837 ◽

2019 ◽

Vol 8 (8) ◽

pp. 837 ◽

Cited By ~ 3

Author(s):

Qin ◽

Mo ◽

Xun ◽

Zhang ◽

Dong

Keyword(s):

Solid State ◽

Field Effect Transistors ◽

Cooling System ◽

Short Circuit ◽

Circuit Breaker ◽

Short Circuit Current ◽

Oxide Semiconductor ◽

Circuit Breakers ◽

Solid State Circuit ◽

Protection Method

Due to the lower on-state resistance, direct current (DC) solid state circuit breakers (SSCBs) based on silicon-carbide (SiC) metal-oxide-semiconductor field-effect transistors (MOSFETs) can reduce on-state losses and the investment of the cooling system when compared to breakers based on silicon (Si) MOSFETs. However, SiC MOSFETs, with smaller die area and higher current density, lead to weaker short-circuit ability, shorter short-circuit withstand time and higher protection requirements. To improve the reliability and short-circuit capability of SiC-based DC solid state circuit breakers, the short-circuit fault mechanisms of Si MOSFETs and SiC MOSFETs are revealed. Combined with the desaturation detection (DESAT), a “soft turn-off” short-circuit protection method based on source parasitic inductor is proposed. When the DESAT protection is activated, the “soft turn-off” method can protect the MOSFET against short-circuit and overcurrent. The proposed SSCB, combined with the flexibility of the DSP, has the μs-scale ultrafast response time to overcurrent detection. Finally, the effectiveness of the proposed method is validated by the experimental platform. The method can reduce the voltage stress of the power device, and it can also suppress the short-circuit current.

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Short-Circuit Current Criterion under Condition of Protection Action in Low Voltage Power Supply System

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.860-863.1914 ◽

2013 ◽

Vol 860-863 ◽

pp. 1914-1918

Author(s):

Yi Rong Su ◽

Jie Yu ◽

Jun Liu ◽

Gan Zhou ◽

Li Ping Zhan ◽

...

Keyword(s):

Power Supply ◽

Power Supply System ◽

Low Voltage ◽

Short Circuit ◽

Short Circuit Current ◽

Supply System ◽

Circuit Breakers ◽

Level Of Automation ◽

Current Criterion ◽

The Impact

In order to improve the level of automation and security of the low voltage power supply system, this paper proposed the calculation method of short-circuit current criterion under condition of protection action. Firstly, the impact of circuit breakers on the short-circuit current is analyzed. Then, the current criterion under condition of short-circuit protection are given. Finally, using a special case, the calculation process of aforementioned current criterion is given in detail.

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ANALISIS HUBUNG SINGKAT PADA GARDU INDUK 150/20 KV (STUDI KASUS DI GARDU INDUK GANDUL, CINERE)

Journal of Electrical Vocational Education and Technology ◽

10.21009/jevet.0042.09 ◽

2020 ◽

Vol 4 (2) ◽

pp. 53-59

Author(s):

Cilvia Calnela ◽

Suyitno ◽

Imam Arif Raharjo

Keyword(s):

Short Circuit ◽

Circuit Breaker ◽

Short Circuit Current ◽

Power Station ◽

Three Phase ◽

Qualitative Descriptive ◽

The Subject ◽

The Difference ◽

Short Circuit Fault ◽

Manual Calculation

This study aims to determine the difference in short circuit current with manual calculation and ETAP 12.60 Simulation in to know the suitability of capacity circuit breaker Substasion 150/20 kV at Gandul. The used method is qualitative descriptive method. The subject that will be studied is short circuit on the substation 150/20 kV Gandul Cinere. The research was conducted by using is manual calculation and software ETAP 12.60 simulation. The results obtained is differences of the short circuit current is not significant between the manual calculation and software ETAP 12.60 simulation in three conditions include 0.572% for the conditions of short circuit fault of one phase to ground, 0.884% for the conditions of short circuit fault of phase to phase and last 0.884% for the short circuit fault of three phase. Furthermore, the result of the calculation of the short circuit current will be used as an indicator of a determinant of the suitability of the capacity circuit breaker substation 150/20 kV at Gandul , obtained that a comparison of the rating circuit breaker installed (existing) is great against the result of the election of the rating circuit breaker base on manual calculation. So it can be concluded that the circuit breaker beinstalled on the substation 150/20 KV at Gandul, has a capacity that suits your needs and still fit for use. ABSTRAK Penelitian ini bertujuan untuk mengetahui perbedaan besar arus hubung singkat antara perhitungan manual dan simulasi ETAP Power Station 12.6 serta untuk mengetahui kesesuaian kapasitas pemutus tenaga GI Gandul 150/20 kV. Metode yang digunakan adalah deskriptif kualitatif. Subjek pada penelitian ini adalah arus hubung singkat pada Gardu Induk 150/20 kV Gandul Cinere. Penelitian dilakukan menggunakan perhitungan manual dan simulasi software ETAP Power Station 12.6. Hasil penelitian diperoleh bahwa perbedaan hasil arus hubung singkat yang tidak signifikan antara perhitungan manual dan simulasi software ETAP Power Station 12.6 dalam tiga kondisi meliputi 0.572% untuk kondisi gangguan hubung singkat salah satu fasa ketanah, 0.884% untuk kondisi gangguan arus hubung singkat fasa ke fasa dan terakhir 0.884% untuk gangguan arus hubung singkat tiga fasa. Selanjutnya, hasil perhitungan arus hubung singkat tersebut akan digunakan sebagai indikator penentu kesesuaian kapasitas pemutus PMT (Circuit Breaker) GI Gandul 150/20 kV, diperoleh bahwa perbandingan rating pemutus PMT yang terpasang (existing) lebih besar terhadap hasil pemilihan rating pemutus PMT berdasarkan perhitungan manual. Sehingga dapat disimpulkan bahwa pemutus tenaga yang terpasang pada di GI Gandul 150/20 kV memiliki kapasitas yang sesuai dengan kebutuhan dan masih layak digunakan.

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Circuit Breakers in Low- and Medium-Voltage DC Microgrids for Protection against Short-Circuit Electrical Faults: Evolution and Future Challenges

Applied Sciences ◽

10.3390/app12010015 ◽

2021 ◽

Vol 12 (1) ◽

pp. 15

Author(s):

Bayron Perea-Mena ◽

Jaime A. Valencia-Velasquez ◽

Jesús M. López-Lezama ◽

Juan B. Cano-Quintero ◽

Nicolás Muñoz-Galeano

Keyword(s):

Low Voltage ◽

Short Circuit ◽

Circuit Breaker ◽

Circuit Breakers ◽

Medium Voltage ◽

Advantages And Disadvantages ◽

General Terms ◽

Future Challenges ◽

Electrical Faults ◽

Medium Voltage Dc

This paper deals with circuit breakers (CBs) used in direct current microgrids (DCMGs) for protection against electrical faults, focusing on their evolution and future challenges in low voltage (<1.5 kV) and medium voltage (between 1.5 kV and 20 kV). In recent years, proposals for new circuit-breaker features have grown. Therefore, a review on the evolution of circuit breakers for DCMGs is of utmost importance. In general terms, this paper presents a review concerning the evolution of circuit breakers used in DCMGs, focusing on fuses, mechanical circuit breakers (MCBs), solid-state circuit breakers (SSCBs), and hybrid circuit breakers (HCBs). Their evolution is presented highlighting the advantages and disadvantages of each device. It was found that although modern circuit breakers have begun to be commercially available, many of them are still under development; consequently, some traditional fuses and MCBs are still common in DCMGs, but under certain restrictions or limitations. Future challenges that would allow a successful and adequate implementation of circuit breakers in DCMGs are also presented.

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Hybrid self-controlled precharge-free CAM design for low power and high performance

TURKISH JOURNAL OF ELECTRICAL ENGINEERING & COMPUTER SCIENCES ◽

10.3906/elk-1807-271 ◽

2019 ◽

pp. 1132-1146

Author(s):

V V SATYANARAYANA SATTI ◽

SRIDEVI SRIADIBHATLA

Keyword(s):

Power Consumption ◽

High Speed ◽

High Performance ◽

Supply Voltage ◽

Short Circuit ◽

Short Circuit Current ◽

Charge Sharing ◽

Content Addressable Memory ◽

Current Path ◽

High Power Consumption

Content-addressable memory (CAM) is a prominent hardware for high-speed lookup search, but consumes larger power. Traditional NOR and NAND match-line (ML) architectures suffer from a short circuit current path sharing and charge sharing respectively during precharge. The recently proposed precharge-free CAM suffers from high search delay and the subsequently proposed self-controlled precharge-free CAM suffers from high power consumption. This paper presents a hybrid self-controlled precharge-free (HSCPF) CAM architecture, which uses a novel charge control circuitry to reduce search delay as well as power consumption. The proposed and existing CAM ML architectures were developed using CMOS 45nm technology node with a supply voltage of 1 V. Simulation results show that the proposed HSCPF CAM-type ML design reduces power consumption and search delay effectively when compared to recent precharge-free CAM-type ML architectural designs.

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