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When a fault occurs on a transmission line, fault generated high frequency transient components are a series of natural frequencies in frequency domain. This paper proposes a protection algorithm for EHV (Extra High Voltage) transmission line based on spectrum characteristic of natural frequency. Spectrum correlation coefficient is used to determine whether a fault is internal or external fault. It...
This paper presents a brief review of the coordination issues between the settings for generator automatic voltage regulator (AVR) overflux (V/Hz) limiters and monitors and the overflux protection relay settings. Recent blackouts have caused NERC (North American Electric Reliability Council) to develop standards for coordination of generator excitation control and protection with the aim of improving...
Methods for the assessment of the dynamic network security, with regard to the installed protection system, are introduced. Currently, an accordant online system is under development together with European Universities and European Transmission System Operators. Here, the purpose is the observation of the security of the overall system, consisting of primary network and the superimposed interacting...
The paper presents the application of software tools to simulate system dynamic behavior together with the possibility to select critical contingencies of an electrical energy system. The protection system, which is connected to the primary system via vts, cts and trip contacts, is running in parallel during system simulations, with all necessary relay functions, characteristics, settings and communication...
It is difficult to select the faulty feeder when a high resistance earthed fault happened in non-solidly grounded systems. In the paper inversion transform theory is employed to analyze and discuss the voltage vector characteristics so as to provide the evidence for clearing faulty feeder when a high resistance earthed fault happened. Based on the analysis, we get the following conclusions: the phase...
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