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Based on the analysis of the relationship between the terminal voltages and the reactive power of a generator, the shortcomings of the available scheme to protect generators in parallel from overvoltage have been pointed out, and a novel overvoltage protection scheme is put forward. For machines connected directly to busbars, especially for powerformers, a novel type of high voltage generators, this...
The increased interest in using ultra-high-voltage (UHV) transmissions has stimulated research in UHV operation characteristic and correlative relay protections. Operational experience in UHV is limited and hence there is a need to model UHV transmission systems and test the operational performance of traditional protection devices already in use on high-voltage (HV) and extra-high-voltage (EHV) systems...
It is well known that most adaptive auto-reclosure schemes are dependent on the voltages sampled from the transmission lines to distinguish between the transient faults and the permanent faults, therefore the transforming characteristics or required mounting position of the voltage transducer limits the applications of voltage based schemes. To overcome this disadvantage, a criterion of dual-window...
The double circuit or parallel transmission lines are more and more widely used in modern power system to improve transmission capability and reliability. Many types of relaying protection techniques can be used to protect parallel double transmission lines, such as over-current relay, distance relay and pilot relay[1]. Current and distance relays do not need communication channel but can not operate...
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