Papers by Keyword: Transient Fault

Abstract: The phase voltage of the tripping phase contains capacitive coupling voltage and inductive coupling voltage. According to the continuous improvement of the national voltage grade, the parallel transmission lines on the same tower are widely used in main transmission section. The protection will trip the fault phases while inner-line or inter-line faults occur. The phase voltage of the tripping phase contains capacitive coupling voltage and inductive coupling voltage. Terminal voltage when the lines are in transient faults is much higher than in permanent faults because of the line discharging by fault point. Simulation studies show that the terminal voltage criterion can distinguish transient and permanent fault in parallel transmission lines.

Abstract: Importance measures are widely used to characterize the contribution of components to the system performance such as reliability, availability, risk, etc, and thus give great help in identifying system weaknesses and prioritizing system improvement activities. Although much work has been carried out on component importance analysis, most studies only concern the consistent states of components within which components exhibit consistent performance until state changes happen. Unfortunately, field data shows that many transient faults in components may result in severe consequences without causing any state changes, and, this can lead to a misunderstanding of component importance. This paper focuses on the reliability importance analysis in presence of transient faults, and proposes a composite measure for evaluation. A sample series parallel system is analyzed to illustrate the use of this measure.