scholarly journals Vacuum Large Current Parallel Transfer Numerical Analysis

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
Enyuan Dong ◽  
Shengkai Hou ◽  
Xiang Zheng ◽  
Taotao Qin ◽  
Guixin Liu ◽  
...  
Keyword(s):  
Circuit Breaker ◽  
Difficult Problem ◽  
Vacuum Arc ◽  
Stable Operation ◽  
Transfer Time ◽  
Generator Circuit ◽  
Proper Timing ◽  
Large Current ◽  
Vacuum Generator ◽  
Opening Phase

The stable operation and reliable breaking of large generator current are a difficult problem in power system. It can be solved successfully by the parallel interrupters and proper timing sequence with phase-control technology, in which the strategy of breaker’s control is decided by the time of both the first-opening phase and second-opening phase. The precise transfer current’s model can provide the proper timing sequence to break the generator circuit breaker. By analysis of the transfer current’s experiments and data, the real vacuum arc resistance and precise correctional model in the large transfer current’s process are obtained in this paper. The transfer time calculated by the correctional model of transfer current is very close to the actual transfer time. It can provide guidance for planning proper timing sequence and breaking the vacuum generator circuit breaker with the parallel interrupters.

200 kA circuit breaker with 10 μsec current transfer time

1975 ◽  
Vol 46 (11) ◽  
pp. 1542-1545 ◽  
Author(s):  
C. A. Bleys ◽  
D. Lebely ◽  
C. Rioux ◽  
F. Rioux‐Damidau
Keyword(s):  
Circuit Breaker ◽  
Current Transfer ◽  
Transfer Time

scholarly journals Research on Vacuum Arc Commutation Characteristics of a Natural-Commutate Hybrid DC Circuit Breaker

Energies ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4823
Author(s):  
Dequan Wang ◽  
Minfu Liao ◽  
Rufan Wang ◽  
Tenghui Li ◽  
Jun Qiu ◽  
...  
Keyword(s):  
Solid State ◽  
Theoretical Analysis ◽  
Theoretical Foundation ◽  
Circuit Breaker ◽  
Vacuum Arc ◽  
Important Process ◽  
Mathematical Formula ◽  
Arc Voltage ◽  
Dc Circuit Breaker ◽  
Key Parameter

Vacuum arc commutation is an important process in natural-commutate hybrid direct current (DC) circuit breaker (NHCB) interruption, as the duration of vacuum arc commutation will directly affect the arcing time and interrupting time of NHCB. In this paper, the vacuum arc commutation model of NHCB was established by simplifying solid-state switch (SS) and vacuum arc voltage. Through theoretical analysis and experiments, the vacuum arc commutation characteristics of NHCB were studied. The mathematical formula of the effect of main parameters on the duration of vacuum arc commutation is obtained, and the changing law of the influence of the main parameters on the duration of the vacuum arc commutation is explored. The concept of vacuum arc commutation coefficient is proposed, and it is a key parameter that influences the vacuum arc commutation characteristics. The research on the characteristics of vacuum arc commutation can provide theoretical foundation for the structure and parameter optimization of NHCB and other equipment that uses vacuum arc commutation.

Extraction of the Geometric Features from the Vacuum Switching Arc Images

2013 ◽  
Vol 333-335 ◽  
pp. 860-863
Author(s):  
Hua Jun Dong ◽  
Wen Liang Dong ◽  
Kai Kang ◽  
Dao Shun Wang
Keyword(s):  
Power System ◽  
High Speed ◽  
Circuit Breaker ◽  
Morphological Characteristics ◽  
Vacuum Arc ◽  
Cmos Camera ◽  
Camera System ◽  
Vacuum Switch ◽  
Vacuum Circuit Breaker ◽  
Critical Components

Vacuum circuit breaker is one of the major critical components that controls and protects the power system. The breaking capability of the vacuum switch directly affects the safety of the power system. However, the breaking capability of the vacuum switch is determined by the morphological characteristics of the vacuum arc images. In this paper, in order to research the variation of the vacuum arc, a high-speed CMOS camera system is used to collect the vacuum arc images within a short gap (7mm), the morphological characteristics of the vacuum arc images are extracted based on the digital image processing. At last, the variation of the arc is analyzed.

scholarly journals Reliability Evaluation for Cyber-Physical Smart Substation

Complexity ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Yangrong Chen ◽  
Jun’e Li ◽  
Ang Xu ◽  
Kai Yuan ◽  
Kaipei Liu
Keyword(s):  
Smart Grid ◽  
Hybrid Method ◽  
Sampling Method ◽  
Circuit Breaker ◽  
Latin Hypercube Sampling ◽  
Reliability Evaluation ◽  
Stable Operation ◽  
Reliability Indices ◽  
Physical Interactions ◽  
Smart Substation

Smart substation is the key part of smart grid. The reliability of smart substation is extremely important to the safe and stable operation of the smart grid. Smart substation is a cyber-physical system (CPS). Hence, this paper conducts reliability evaluation study for smart substation from the perspective of CPS. Firstly, the basic reliability indices of cyber and physical elements of smart substation are presented. The reliability index of one cyber element takes into account the reliability factors of data leakage, tampering, loss and delay, etc., on the cyber side. Then, the cyber-physical interactions of smart substation are analyzed. It is concluded that the effect of the cyber side and cyber-physical interactions on the reliability of smart substation is reflected in the effect of measurement and control messages on circuit breaker operation. And, the new reliability indices considering cyber-physical interactions are proposed. Furthermore, the MALI-hybrid method, which combines the Monte Carlo method, analytical method, Latin hypercube sampling method, and important sampling method, is presented for evaluating the reliability of smart substation. Finally, the rationality of the proposed reliability indices, the efficiency, and correctness of MALI-hybrid method are verified by case studies.

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