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The integration of distributed generation transforms current distribution networks from vertically operated to horizontally operated. This transition leads to problems related to protection coordination. In the future, new protection philosophies should be applied which guarantee the increase of the during-fault distributed generation availability. The paper presents a protection scheme based on fault...
Microgrids have been proposed as a way of integrating large numbers of distributed renewable energy sources with distribution systems. One problem with microgrid implementation is designing a proper protection scheme. It has been shown that traditional protection schemes will not work successfully. In this paper a protection scheme using digital relays with a communication network is proposed for...
Optical methods for the measurement of current and voltage in high-voltage (HV) environments have been attracting more and more attention in the recent years. A novel electronic current transformer (ECT) with optical transmitting link and optically powered technology has been designed for metering or protection purposes. The structure of the ECT is described in detail in the paper. An ECT prototype...
This paper introduces a novel method of islanding detection for distributed generation networks employing negative sequence impedance measurement. The negative sequence impedance islanding detection method (NSIID) is an improvement on previous impedance measurement techniques for islanding detection because it has a small non-detection zone and large threshold window, which previous techniques have...
A deregulated power market is making short-circuit currents likely to exceed the thermal or mechanical permissible limits of switchgear. Consequently fault current limiters (FCL) become more applicable in power systems. The use of FCLs has an impact on the protection schemes and functions in electrical systems. Thus, before FCLs will be applied in the network the interactions between this new substation...
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