Search

Today high speed protection of power system elements is necessary and realizable. This paper introduces time-domain protection techniques for transmission lines using voltage and current signals in Cartesian coordinates. Three techniques are proposed using this approach for line protection. Direction of fault is obtained using change in angle between Cartesian planes of voltage and current. In the second application on unit protection scheme, internal and external faults in transmission lines are discriminated using dot product of the normals to both end current planes. Fault type identification is obtained using the angle between incremental changes in currents in Cartesian coordinates. The output of each protection function using the new concept is derived in a quarter-cycle. The performance of each of the proposed techniques is tested for load variation, high resistance fault, different fault types, power swing, fault inception angles and signal with noise. Further, the proposed techniques are evaluated using field data from a 400 kV double circuit line. [ABSTRACT FROM AUTHOR]

Hydatid cyst disease of the spine is rare, and only a few are reported in the scientific literature. This infection is caused by the larvae of Echinococcus granulosus cestode. The presentation is usually late because the patient remains asymptomatic for a longer duration after the infection. The initial form of treatment is always surgical in a symptomatic patient for excision of the diseased tissue. A 35-year-old male presented in the outpatient department with a chief complaint of mid-back pain and intermittent history of fever following his back surgery for 4 years. The patient has taken presumptive treatment for tuberculosis before presenting it to us. Radiological investigations dictate the presence of hydatid cyst in the D4 vertebra. Intact cysts were excised with perioperative albendazole coverage. The patient was mobilized on postoperative day-1 with Taylor's brace, and the brace was continued for 6 weeks. The patient was followed up at regular intervals for 1 year, and no recurrence was found. Hydatid cyst disease in the spine is a rare disease but associated with high morbidity despite significant advances in diagnostic imaging techniques and surgical treatment. For a provisional diagnosis, magnetic resonance imaging is the investigation of choice. Surgical decompression is the main stray of treatment along with antihelminthic therapy. A close follow-up is required after the initial treatment to find the recurrence at the earliest. [ABSTRACT FROM AUTHOR]

Introduction: Floating hip with hip dislocation is a very high-energy, devastating, and rare injury whose treatment is very challenging, and the outcome is usually poor., Case Report: A 35-year-old man presented posterior wall fracture acetabulum and dislocation of the hip with ipsilateral distal third shaft femur fracture with intra-articular extension fracture and un-displaced patella fracture. We achieved a reduction of hip dislocation by a knee-spanning external fixator followed by open reduction and internal fixation with anatomical locking plate for distal third femur fracture with intra-articular extension followed by open reduction and internal fixation for posterior wall of acetabulum with recon plate in Kocher-Langenbeck approach in stages. The patient was able to partial weight bear after 12 weeks of the injury and mobilized independently without any support after 5 months., Conclusion: Floating hip with hip dislocation is difficult to manage but reducing the hip dislocation with knee spanning external fixator and management in stages will reduce the complications and better outcome., Competing Interests: Conflict of Interest: Nil, (Copyright: © Indian Orthopaedic Research Group.)

Objective  To compare the effectiveness of the early accelerated rehabilitation and delayed conservative rehabilitation protocols after arthroscopic anterior cruciate ligament reconstruction, in terms of the International Knee Documentation Committee (IKDC) score, pain (according to the Visual Analog Scale), laxity, and stiffness one year postoperatively to determine the best outcome. Materials and Methods  A total of 80 subjects were divided into 2e groups (early accelerated group and delayed conservative group), which were analyzed by the Pearson Chi-squared and Wilcoxon rank-sum tests. Results  One year postoperatively, knee laxity was significantly higher ( p  = 0.039) in the early accelerated group compared with the delayed conservative group. Regarding postoperative pain (according to the Visual Analogue Scale) and IKDC scores, both groups presented similar results. The postoperative range of motion was better in the early accelerated group, but this was not statistically significant ( p  = 0.36). Conclusion  One year postoperatively, the early accelerated rehabilitation protocol was associated with significant knee laxity compared to the delayed conservative rehabilitation protocol., Competing Interests: Conflito de Interesses Os autores declaram não haver conflito de interesses., (Sociedade Brasileira de Ortopedia e Traumatologia. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commecial purposes, or adapted, remixed, transformed or built upon. ( https://creativecommons.org/licenses/by-nc-nd/4.0/ ).)