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This paper investigates the relationship between post fault transient overvoltages and the functionality of the numerical distance protection. The study is conducted on a 66kV network with a neutral earth resistor as method to earth the power system.
Advanced distance protection relays represent a significant challenge for many tasks that are performed by protection specialists during the engineering, commissioning and maintenance process due to the fact that the design and implementation of these functions varies significantly from one vendor to another. The paper analyzes the different components of a distance protection function. The modeling...
This paper presents an assessment of the performance of distance protection for transmission lines in the presence of Quadrature Booster Transformers (QBs). The use of QBs in the UK transmission grid is increasing to maximise the utility of existing infrastructure as well as enabling rapid network modifications as dictated by operational requirements. An analysis is performed with the aid of a real...
The phenomenon examined in this paper are some of the most difficult conditions for distance protection, but by no means an exhaustive list. The strength of Distance protection lies in making reliable decisions using only local measurements. The measures taken are as diverse as the conditions considered. As far as possible the methods recommended in this paper use local measurements to stabilise and...
Series capacitor compensation has been predominantly used to enhance bulk power transfer and stability margin between large interconnected regions by partially compensating the inductive impedance of the transmission line. Nevertheless, the installation of this advanced technology could undermine the effectiveness of some conventional line protection. This paper highlights several challenges of protecting...
Multiterminal lines can be protected by distance protection and/or unit protection schemes. A well known fact of multiterminal lines, equipped with distance protection, is the inherent complexity for current in-feed and backup zone coverage. Prior to this millennium most relays (for this particular application) were unable to achieve the desired backup coverage due to limitations in zoned technologies...
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