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For disadvantages such as plenty of low level risk factors, strong fuzzy characteristics and regional differences between urban and rural areas in traditional distribution network fault risk assessment, a comprehensive risk assessment method with multi-factor influence and multi-region effect is proposed to describe different influence on fault risk assessment for distribution network based on rough...
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...
This paper introduces a simulation and training systems of protective relaying based on competent technology, which takes fault filter data and simulation data as data sources. Visual C++ programming language is used for data modeling base on IEC61850 standard. A base model describing the function of protection and control devices and the principle of action logic and its training applications are...
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 paper presents a new phase coordinate algorithm for analysis faulted AC double-circuit lines. Different topologies of double-circuit lines are considered. Different types of short circuit faults, inter-circuit faults and open conductor faults are treated in a general fault conditions. The development of the algorithm is based on the matrix transformation and port network theory in phase coordinates...
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...
The conventional symmetrical components fault analysis method may not be practically feasible in case of the analysis of simultaneous faults, especially in inherently unbalanced power systems because of the difficulties encountered in the assembly of sequence networks and their solution. To alleviate these problems, this paper presents a new algorithm for computer which is suitable for analyzing arbitrary...
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