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Distributed generation is increasingly likely to play a major role in electricity supply systems as recognition is made of its low carbon credentials. However, the integration of these units at distribution voltages is a major challenge for utilities. One particular issue is that generators may, unintentionally, continue to supply local demand when areas of the network are isolated from the main system...
This paper describes how dynamic line rating (DLR) is applied for load management and protection in two applications to enable a larger penetration of wind generation. One application is installed by Central Networks on a 132kV double-circuit line between Skegness and Boston (North East of England). Another application of the DLR approach is installed by Northern Ireland Electricity (NIE) on the Omagh...
Due to the increase in penetration of Distributed Generation (DG), the performance of power system protection at the distribution level is becoming increasingly critical to the reliable operation and stability of the whole system. This paper presents a critical assessment of the practice and performance of Loss-Of-Mains (LOM) protection (also referred to as anti-islanding protection), underpinned...
Currently, distribution network operators face a number of challenges such as load growth, the proliferation of distributed generation (DG) and ageing infrastructure. This is drawing attention to dynamic thermal rating and coordinated distributed generation output control techniques which will allow the increased utilisation of power system assets to be realised. The work described in this paper was...
This paper presents a simulation model of DC traction system which is based on bilateral power supply mode. The model of two substation rectifiers in one track section has been proposed which is according to practical situation. The modeling was conducted with respect to the variations of the starting-up process and short circuit conditions. By comparing and investigating the simulation results of...
This paper describes how dynamic line rating is applied for load management and protection of a 132 kV line between Skegness and Boston (North East of England) thereby enabling a larger penetration of wind generation. The rating of the line is calculated dynamically from local weather measurements to co-ordinate allowed generation automatically. As a back-up system, in case for some reason the wind...
This paper describes the development of a new 100% generator stator earth fault protection scheme, based on low frequency injection principle. The design of a new analogue input module and the digital filtering technique are presented. Results of the simulation and site testing are also discussed.
The paper describes the design and operation of a transient polarity comparison technique for the protection of transformer-feeder circuits. In contrast to conventional directional comparison technique, the proposed technique utilises fault generated transient signals rather than 50 Hz components. By this arrangement, the performance of the relay is not affected by problems using power frequency measurement,...
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