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This study deals with the idea that comprehensive knowledge representation should be established for fault diagnosis. Sufficient grid fault information including the network topology and protection knowledge are used with a diagnostic algorithm. In this way, the fault diagnosis programme not only facilitates accurate judgment of fault sections for which many kinds of information are available but...
With the ever increasingly enlarge and complicate development of the power systems, operators office would be flooded with extraordinarily abundant alarm information of the relevant relay equipments which can hardly be processed whenever the fault occurs. Fault diagnosis system can locate the fault equipments and the improperly executed relays according to the structure of power grid and the fault...
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...
The paper presents a new protection principle for double circuit transmission lines of bipolar HVDC transmission system. By comparing the magnitudes of fault component of voltages on the bipolar lines, the faulty line can be identified. By comparing the polarities of fault component of currents at the ends of the faulty line, the internal faults and external faults can be differentiated. The principle...
This paper proposed a method for modelling of power system fault diagnosis process. In this process, electrical power system fault diagnosis needs three kinds of information to identify fault components: protection-breaker associations, breaker-primary component (such as line, transformer, bus and so on) associations and protection-primary component associations. Firstly, the protection setting values...
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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