scholarly journals Research on a Novel DC Circuit Breaker Based on Artificial Current Zero-Crossing

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 36070-36079 ◽  
Author(s):  
Shangfu Teng ◽  
Zhifeng Zhang ◽  
Liye Xiao
Keyword(s):  
Circuit Breaker ◽  
Zero Crossing ◽  
Dc Circuit Breaker ◽  
Current Zero

A Novel Forced Resonant Mechanical DC Circuit Breaker by Using Auxiliary Oscillation Switch for Zero-crossing

2021 ◽  
pp. 1-1
Author(s):  
Lei Qi ◽  
Xilin Chen ◽  
Xinyuan Qu ◽  
Liangtao Zhan ◽  
Xiangyu Zhang ◽  
...  
Keyword(s):  
Circuit Breaker ◽  
Zero Crossing ◽  
Dc Circuit Breaker

scholarly journals Comparison of the Interrupting Capability of Gas Circuit Breaker According to SF6, g3, and CO2/O2 Mixture

Energies ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 6388
Author(s):  
Woo-Young Lee ◽  
Jang-Un Jun ◽  
Ho-Seok Oh ◽  
Jun-Kyu Park ◽  
Yeon-Ho Oh ◽  
...  
Keyword(s):  
Circuit Breaker ◽  
Filling Pressure ◽  
The Other ◽  
Zero Crossing ◽  
Arc Voltage ◽  
Transient Recovery Voltage ◽  
Test Circuit ◽  
Arc Current ◽  
Recovery Voltage ◽  
Current Zero

In the study, an interrupting performance test on the 145 kV gas circuit breaker is performed according to three different gases: SF6, g3 (5% NovecTM4710 with 95% CO2), and CO2(70%)/O2(30%) gases. Thanks to research advancements, it is confirmed that CO2 and g3 (5% NovecTM 4710) gases, respectively, have 40% and 75% dielectric strength, compared to that of SF6 gas. The filling pressure and transient recovery voltage criteria of each gas were determined differently in order to compare the maximum interrupting performance of each gas. The pressure of SF6 gas was determined to be 5.5 bar, which is typically used in circuit breakers. The pressure of the other two gases was determined to be 8.0 bar (the maximum available pressure of the test circuit breaker) to find the maximum interrupting performance. Moreover, the rate-of-rise of transient recovery voltage of SF6 was determined as 10 kV/μs, which is the value at the state of maximum interrupting performance of the test circuit breaker with SF6. On the other hand, the rate-of-rise of transient recovery voltages of g3 (5% NovecTM4710 with 95% CO2) and CO2(70%)/O2(30%) gases were, respectively, determined as 4∼5 kV/μs to find the interruption available point. The characteristics of arc conductance, arc current, and arc voltage near the current zero, and post-arc current are analyzed to compare the interrupting performance, according to different arc-quenching gases. The arc current is measured using a current transformer (Rogowski coil), and a signal processing method of the arc current and arc voltage is introduced to increase the reliability of the interrupting performance results. As a result of the test, it is confirmed that the critical arc conductance for all test conditions converged within a certain range and the value is around 0.7 mS. In addition, the critical current slope just before the current zero-crossing during the interrupting process is shown to be 1.8 A/μs between interruption success and failure. Consequently, it is verified that the CO2(70%)/O2(30%) mixture and g3 (5% NovecTM4710 with 95% CO2) have a similar arc extinguishing performance and SF6 has a relatively higher extinguishing performance than that of CO2(70%)/O2(30%) mixture and g3 (5% NovecTM4710 with 95% CO2) under the aforementioned filling pressure and TRV conditions.

Mechanical arcless dc circuit breaker by current zero operation

1992 ◽  
Vol 63 (8) ◽  
pp. 3993-3999 ◽  
Author(s):  
S. Yamaguchi ◽  
H. Sasao ◽  
H. Hasegawa ◽  
K. Ikeda ◽  
T. Tukamoto
Keyword(s):  
Circuit Breaker ◽  
Dc Circuit Breaker ◽  
Current Zero

scholarly journals A Zero Crossing Hybrid Bidirectional DC Circuit Breaker for HVDC Transmission Systems

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1349
Author(s):  
Geon Kim ◽  
Jin Sung Lee ◽  
Jin Hyo Park ◽  
Hyun Duck Choi ◽  
Myoung Jin Lee
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
High Power ◽  
Circuit Breaker ◽  
Fault Current ◽  
Line Load ◽  
Zero Crossing ◽  
Hvdc Transmission ◽  
Dc Circuit Breaker ◽  
Current Flows

With the increasing demand for renewable energy power generation systems, high-power DC transmission technology is drawing considerable attention. As a result, stability issues associated with high power DC transmission have been highlighted. One of these problems is the fault current that appears when a fault occurs in the transmission line. If the fault current flows in the transmission line, it has a serious adverse effect on the rectifier stage, inverter stage and transmission line load. This makes the transmission technology less reliable and can lead to secondary problems such as fire. Therefore, fault current must be managed safely. DC circuit breaker technology has been proposed to solve this problem. However, conventional technologies generally do not take into account the effects of fault current on the transmission line, and their efficiency is relatively low. The purpose of this study is to introduce an improved DC circuit breaker that uses a blocking inductor to minimize the effect of fault current on the transmission line. It also uses a ground inductor to efficiently manage the LC resonant current and dissipate residual current. DC circuit breakers minimize adverse effects on external elements and transmission lines because the use of elements placed on each is distinct. All of these processes are precisely verified by conducting simulation under 200 MVA (±100 kV) conditions based on the VSC-based HVDC transmission link. In addition, the mechanism was explained by analyzing the simulation results to increase the reliability of the circuit in this paper.

scholarly journals Prospects of regenerative current breaking in DC circuit breaker topology

2021 ◽  
Vol 10 (3) ◽  
pp. 217
Author(s):  
S. M. Sanzad Lumen ◽  
Ramani Kannan ◽  
Nor Zaihar Yahaya
Keyword(s):  
Power System ◽  
Circuit Breaker ◽  
Normal Operation ◽  
Stored Energy ◽  
Zero Crossing ◽  
Nonlinear Resistor ◽  
Dc Power ◽  
Main Challenge ◽  
Dc Circuit Breaker ◽  
Ac Current

Due to the stunning advancement of power electronics, DC power system is getting immense attention in the field of research. Protection and hereafter the protective devices for the DC power system application are two vital areas that need to be explored and developed further. Designing a protective device such as DC circuit breaker possesses a lot of challenges. The main challenge is to interrupt a current which does not have a natural zero crossing like AC current has. In addition, energy is stored in the network inductances during normal operation. Instantaneous current breaking is opposed by this stored energy during circuit breaker tripping, hence, all the DC circuit breaker topologies proposed in literature use snubber network, nonlinear resistor to dissipate this stored energy as heat during the current breaking operation. However, it is possible to store this energy momentarily and reuse it later by developing an improvised topology. In this paper, the prospects of energy recovery and reuse in a DC circuit breaker was studied and a new topology with regenerative current breaking capability had been proposed. This new topology can feed the stored energy of the network back into the same network after breaking the current and thus can improve the overall system efficiency.

scholarly journals A Resonant Hybrid DC Circuit Breaker for Multi-Terminal HVDC Systems

2020 ◽  
Vol 12 (18) ◽  
pp. 7771
Author(s):  
Ryo Miyara ◽  
Akito Nakadomari ◽  
Hidehito Matayoshi ◽  
Hiroshi Takahashi ◽  
Ashraf M. Hemeida ◽  
...  
Keyword(s):  
Direct Current ◽  
Circuit Breaker ◽  
Zero Point ◽  
Circuit Breakers ◽  
Transmission Systems ◽  
High Voltage Direct Current ◽  
Current Transmission ◽  
Dc Circuit Breaker ◽  
Current Zero ◽  
Hybrid Circuit

High-voltage direct current (DC) transmission systems and multi-terminal direct current transmission systems are attracting attention for expanding the grid to promote introduction of renewable energy. Fault clearing in DC systems is difficult because there is no zero point of current. Hybrid circuit breakers are suitable for fault clearing in DC systems. Conventional hybrid circuit breakers have a hard-switching path that damages the switch. Hard switching damages the device and produces emissions due to harmonic noise. A novel resonant hybrid DC circuit breaker is proposed in this paper. The proposed circuit breaker reduces the damage to the switching device using soft switching due to the current zero point. The proposed circuit breaker is compared with conventional hybrid circuit breakers using numerical simulations. Interruption times and switching types of circuit breakers were compared. The simulation results of the fault clearing characteristics of the proposed breakers show that the proposed breakers have sufficient performance and are capable of stable reconnections in multi-terminal direct current transmission systems.

scholarly journals A new direct current circuit breaker with current regeneration capability

2021 ◽  
Vol 12 (4) ◽  
pp. 2322
Author(s):  
S. M. Sanzad Lumen ◽  
Ramani Kannan ◽  
Nor Zaihar Yahaya
Keyword(s):  
Power Systems ◽  
Direct Current ◽  
Normal Load ◽  
Circuit Breaker ◽  
Vital Role ◽  
Normal Operation ◽  
Stored Energy ◽  
Zero Crossing ◽  
Dc Circuit Breaker ◽  
Regeneration Capability

Direct current (DC) power systems are becoming very popular due to better control ability and equipment reliability thanks to the continuous development of power electronics. A DC circuit breaker (DCCB) used for current interruption in a DC network is a major part of the system. It plays the vital role of isolating networks during fault clearing as well as during normal load switching. Breaking the DC current is a major challenge as it does not have any natural zero crossing points like the AC current has. In addition, energy stored in the network inductances during normal operation opposes the instantaneous current breaking. Hence, all the conventional DC circuit breaker topologies use lossy elements to dissipate this stored energy as heat during the current breaking operation. However, it is possible to store this energy and reuse it later by developing an improvised topology. In this paper, the prospects of energy recovery and reuse in DC circuit breakers have been studied, and a new topology with regenerative current breaking capability has been proposed. This new topology can feed the stored energy of the network back into the same network after breaking the current and thus can improve the overall system efficiency.

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