scholarly journals Investigation on the DC CB Performance During a Current Interruption Failure at First Current Zero

2018 ◽  
Author(s):  
Siyuan Liu ◽  
Yingsan Geng ◽  
Marjan Popov ◽  
Jianhua Wang ◽  
Zhiyuan Liu ◽  
...  
Keyword(s):  
Current Interruption ◽  
Current Zero ◽  
A Current

Current Zero Crossing Detection Circuit for Synchronous Rectification Model Buck Converter

2014 ◽  
Vol 571-572 ◽  
pp. 906-909
Author(s):  
Zhu Lei Shao
Keyword(s):  
Buck Converter ◽  
Drain Voltage ◽  
Zero Crossing ◽  
Power Switch ◽  
Detection Circuit ◽  
Synchronous Rectification ◽  
Different Temperatures ◽  
Current Zero ◽  
Voltage Conversion ◽  
A Current

In order to reduce the power consumption of the synchronous rectification model buck converter, a current zero crossing detection circuit is designed in this paper. The detection circuit determines the freewheeling current of the synchronous rectification power switch is zero or not by detecting the drain voltage of synchronous rectification power switch. Due to use transistors instead of resistors in the voltage conversion, the accuracy of the detection circuit is less affected by temperature and process corner. From the experimental results, the detection circuit can make accurate current zero crossing detection in different temperatures and process corners, and the detection circuit has strong robustness.

Study of Generator Source Short-Circuit Currents with Respect to Interrupting the Duty of Generator Circuit Breakers, EMTP Simulation, ANSI/IEEE and IEC Methods

2008 ◽  
Vol 9 (3) ◽  
Author(s):  
J. C Das
Keyword(s):  
Short Circuit ◽  
Short Circuit Current ◽  
Circuit Breakers ◽  
Time Constants ◽  
Method Of Calculation ◽  
Generator Circuit ◽  
Dc Component ◽  
Current Zero ◽  
Short Circuit Currents ◽  
A Current

Large generators have high effective X/R ratios and combined with other generator time constants and parameters, a current zero may not be obtained at the time of contact parting, i.e., the dc component of the short-circuit current at the contact parting time is higher than the peak ac component. This is well documented in the current literature. The paper presents calculations of the generator source short-circuit currents of a 234 MVA generator using ANSI/IEEE and IEC standards and EMTP simulation. The results are compared and the application of a generator breaker to meet the requirements of calculated duties are discussed. It shows considerable differences in the results, depending upon the method of calculation.

A Current-Zero Arc Model Based on Forced Convection

1979 ◽  
Vol 7 (4) ◽  
pp. 217-229 ◽  
Author(s):  
M. T. C. Fang ◽  
D. Brannen
Keyword(s):  
Forced Convection ◽  
Model Based ◽  
Arc Model ◽  
Current Zero ◽  
A Current
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