The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
CO2 gas is a possible substitute for SF6 gas in circuit breaker with relatively superior arc interruption performance. To enhance the interruption capacity of the circuit breaker which employs CO2 gas as its arc interruption dielectric, the interruption principle of the hybrid circuit breaker composed of vacuum interrupter and CO2 gas interrupter is studied. Based on the black-box arc models of hybrid...
By series connected with vacuum circuit breaker, the relatively limited arc-interruption capacity of the gas circuit breaker, which employs CO2 gas as the substitution to SF6 gas, can be compensated to match with or approach to the interruption capacity of SF6 gas circuit breaker. To investigate and optimize the voltage distribution between vacuum gap and CO2 gas gap, the three dimension models of...
Nowadays social networks have been dominating the life of majority young people. To enhance internal communication, companies also start to use social networks to communicate inside with their staffs. Yet the answers to what motivates people to participate in social networks still remain vague. Thus, this empirical study within China Mobile Beijing area is aimed to find out what motivation factors...
We report on a numerical simulation on <0001> direction and <11–20> direction p+/n/n-/n+ (single drift region) 4H silicon carbide (4H-SiC) Impact-Ionization-Avalanche-Transit-Time (IMPATT) diodes for operation at D-band frequencies. Results show that the output performance of 4H-SiC IMPATT diode is sensitive to the crystal direction of the one-dimensional current flow. The <0001>...
With the development and expansion of modern power system, the double circuit lines on the same tower are used widely as an important electric power transmission mode, but it is particularly complex to determine the failure of the double circuit lines. This paper judge whether the fault occurs in the double circuit lines or not using the topology model according to the information of the fault at...
This paper proposed a hierarchical model for smart substation fault diagnosis. This fault diagnosis system gets fault information from SCADA and fault information system. The information from SCADA, including network topology and switch state, is modeled based on IEC61970-CIM. The protection information from the fault information system is modelled based on IEC61850, then encapsulated CIM model. When...
The conventional fault analysis algorithms and fault analytical models may not be suitable for the ac/dc hybrid systems because of the highly nonlinear converters. To alleviate the problem, the paper presents a steady state short-circuit converter model based on the switching function theory for analyzing faults in the ac system, including asymmetric faults. In order to regard the effect of the short-circuit...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.