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This paper presents a new relay for the protection of power transmission systems by using the global positioning system (GPS) and the transient polarity comparison techniques, the positional polarity comparison relay. A specially designed protection relay detects the fault generated high frequency current transient signals and records the polarity of the transient signal and the time instant corresponding...
The fast development in both microprocessor and transducer technologies has enabled fault detection techniques to be considered which were impractical in the past and encouraged interest in the utilization of fault generated transients for protection. This paper presents an integrated approach for high-speed protection of transmission lines. The technique uses a fault transient detector unit at the...
The paper presents extensive simulation studies with respect to a typical EHV transmission line systems, the proposed protection technique is able to give correct responses for various system and fault condition. Furthermore, the protection scheme offers not only fast protection for individual line section, but also integrated protection for all lines connected to the substation, therefore it could...
This paper presents a new technique for the protection of power transmission systems by using the global positioning system (GPS) and fault generated transients, the integrated positional protection technique. The technique is based on the detection and processing of fault generated high frequency transient signals, in which a centralized protection relay provides the protection of multiple transmission...
This paper presents the extended study on current differential protection schemes based on symmetrical components. The principles of the protection schemes are analyzed firstly. Their performances are evaluated on a typical 500 kV power transmission line system model using EMTP. Extensive simulation studies are presented under various system and fault conditions, such as variations in system load...
Based on the analysis of operation criteria of line current differential relays, this paper proposed a new criterion. Comparing with the existing ones, the proposed criterion has a higher sensitivity for internal faults and more dependability for external faults. Combined with fault components, the new operation criterion offers better performance. Theory calculation and RTDS simulation conducted...
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