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A novel criterion for neutral current differential protection is presented in this paper, which is based on a full research into exist neutral current differential protection schemes used in transmission lines. Compared to traditional ones, the novel criterion can improve the sensitivity under internal fault conditions and improve reliability under external fault conditions. More importantly, the...
This paper presents a new directional comparison protection scheme specially designed for distribution systems. A comprehensive study is performed on different directional discrimination algorithms and relaying schemes in order to assess their performances in distribution systems. An integrated solution was proposed, which combines better performed directional algorithms, such as the Negative sequence-based...
The cross differential protection used to protect parallel double transmission lines is able to offer fast operation without the need for communication link. However, the conventional cross differential relay is not sensitive enough to protect EHV transmission lines because of the requirement for high setting values. In this paper, a percentage cross differential element is used to improve the performance...
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