Browsing by Author "Mourad, Dina"

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Adaptive Single Ended Protection Scheme for parallel Transmission Lines
    (IEEE, 2017) Mourad, Dina; Shehab Eldin, E. H.
    This paper presents a novel and adaptive non communication based protection proposal. It, also, provides a proposed transform, which is named the Akrap transform, to extract the transient components. The proposal uses the positive sequence currents and the Akrap transform to protect the double-circuit transmission line. The suggested proposal consists of two steps; while Step 1 detects internal faults, Step 2 identifies the faulted circuit. The proposal uses the three phase currents measurements at one end of the double circuit line. Thus, there is no need to any communication links. The proposal is evaluated with ATP-EMTP versatile simulations. Moreover, it has advantages like its protection to the total line length and the simple and fewer numbers of equations. It does not depend on the impedances of sources, the initial fault conditions as type of fault, inception time of fault, distance of fault, and resistance of fault and the current transformer saturation.
  • Thumbnail Image
    Item
    Innovative Cos-Sin characteristics to select the faulted zone in view of CT saturation
    (ELSEVIER SCIENCE, 2019) Mourad, Dina
    One area of the major concern of busbar differential schemes is misoperation due to current transformer saturation through close-in out-of-zone faults. A comprehensive fault discrimination scheme is extremely needed for differential protection algorithms to overcome the CT saturation problem. This paper attempts to introduce a method based on innovative Cos-Sin characteristics that is capable of distinguishing between in-zone and out-ofzone faults of busbar protection. The results covered a wide variety of fault scenarios; these results proved the ability of the proposed algorithm to differentiate between in-zone and out-of-zone faults relating to CT saturation conditions. They further demonstrated the noticeable adaptability and performance of the algorithm since it is not affected by such fault parameters as fault type, fault resistance, and fault inception time. Experimental implementation of the devised Cos-Sin signal was conducted and manifested the capability and simplicity of its experimental constructability.