Three-phase short circuit testing of high-voltage circuit breakers using synthetic circuits

2000 ◽  
Vol 15 (1) ◽  
pp. 142-147 ◽  
Author(s):  
D. Dufournet ◽  
G. Montillet
Keyword(s):  
High Voltage ◽  
Short Circuit ◽  
Circuit Testing ◽  
Circuit Breakers ◽  
Three Phase

scholarly journals Symmetrical Loss of Excitation Fault Diagnosis in an Asynchronized High-Voltage Generator

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3054 ◽  
Author(s):  
Yanling Lv ◽  
Yuting Gao ◽  
Jian Zhang ◽  
Chenmin Deng ◽  
Shiqiang Hou
Keyword(s):  
Neural Network ◽  
Fault Diagnosis ◽  
High Voltage ◽  
Short Circuit ◽  
Open Circuit ◽  
Voltage Generator ◽  
Three Phase ◽  
Circuit Loss ◽  
High Voltage Generator ◽  
Short Circuit Fault

As a new type of generator, an asynchronized high-voltage generator has the characteristics of an asynchronous generator and high voltage generator. The effect of the loss of an excitation fault for an asynchronized high-voltage generator and its fault diagnosis technique are still in the research stage. Firstly, a finite element model of the asynchronized high-voltage generator considering the field-circuit-movement coupling is established. Secondly, the three phase short-circuit loss of excitation fault, three phase open-circuit loss of excitation fault, and three phase short-circuit fault on the stator side are analyzed by the simulation method that is applied abroad at present. The fault phenomenon under the stator three phase short-circuit fault is similar to that under the three phase short-circuit loss of excitation. Then, a symmetrical loss of the excitation fault diagnosis system based on wavelet packet analysis and the Back Propagation neural network (BP neural network) is established. At last, we confirm that this system can eliminate the interference of the stator three phase short-circuit fault, accurately diagnose the symmetrical loss of the excitation fault, and judge the type of symmetrical loss of the excitation fault. It saves time to find the fault cause and improves the stability of system operation.

scholarly journals Arcing Behaviors in the Large-capacity HV SF6 Gas-blast Interrupters

2019 ◽  
Vol 6 (2) ◽  
pp. 140-143 ◽  
Author(s):  
S. A. Averyanova ◽  
E. Tonkonogov
Keyword(s):  
High Voltage ◽  
Short Circuit ◽  
Dielectric Strength ◽  
Numerical Results ◽  
Circuit Breakers ◽  
Large Capacity ◽  
Recovery Processes ◽  
Strength Recovery ◽  
Turbulence Effects ◽  
Short Circuit Currents

A comprehension of the dielectric strength recovery processes during the interruption of short-circuit currents in the high-voltage SF<sub>6</sub> gas-blast circuit breakers is necessary for their modernisation in order to increase the rated voltage and short circuit breaking current per one break. This paper presents numerical results of the turbulence effects on the interruption ability in the SF<sub>6</sub> extinguishing arc chamber.

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