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The current interruption capacity of gas gap can be enhanced by series connecting with vacuum gap in hybrid circuit breaker. For the purpose of compensating the inferior interruption performance of CO2 gas gap, as the substitute for SF6 gas gap, the interruption principle and the dielectric strength recovery process of the series gaps of vacuum gap and CO2 gas gap are studied in this paper. Based...
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...
In substations of power system, 3/2 connections are used commonly whose protective relay configurations are complex. There is lots of information when a fault occurs, especially when protective relays and circuit breakers fail to work. How to determine the fault component is particularly intricate. According to above features of 3/2 breaker schemes, this paper put forwards a new fault diagnosis method...
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...
In this paper, an approach of power system fault diagnosis based on the fault information system and forward and backward reasoning is presented. From the fault information system, we get the power network topology and the configuration information of protection; we get the set of suspicious faulted equipments according to the operation rules and the operational information of breaker, protective...
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