Анализ электрической части подстанции «Ала-Арча» и релейная защита трансформатора

Выпускная квалификационная работа 97 с.,18 рис., 25 табл., 7 источников. Выполнен анализ электрических сетей Кыргызской республики. Описано современное состояние энергетики Кыргызской Республики. Также была описана структурная схема ПС 슫Ала-Арча슻. Произведен расчет продолжительных режимов, проанализированы силовые трансформаторы.В работе выбраны и обоснованы устройства релейной защиты трансформатора.Релейная защита выполнена на основе микропроцессорного оборудования MICOM P63х. В качестве основной защиты используется дифференциальная защита с двумя участками торможения и дифференциальная отсечка, а также построена характеристика срабатывания по выбранным уставкам. Для проверки чувствительности рассчитано КЗ на шинах 10 кВ при минимальном режиме работы.Final qualifying work 97 p. , 18 fig. , 25 tab. , 7 sources. The analysis of electric networks of the Kyrgyz Republic. The present state of Energy of the Kyrgyz Republic . It is also a block diagram of the SS " Ala - Archa" has been described .The calculation of continuous operation , analyzed the power transformatory.V selected and justified relaying device transformatora.Releynaya protection is made on the basis of microprocessor equipment MICOM P63h . As the main protection differential protection with two portions of the braking and differential cut-off , as well as built on the selected tripping characteristic setting. To test the sensitivity of the calculated short-circuit on tires with a minimum of 10 kV operation

Оценка риска аварии на участке газопровода

В работе проведена оценка риска на магистральном участке газопровода. Проведен анализ статистических данных по аварийным ситуациям на газопроводах. Выявлены основные факторы и причины возникновения аварий. Проведен анализ опасных веществ транспортируемых по газопроводу. Предложены мероприятия по снижению риска возникновения аварий.In the work, a risk assessment was carried out on the main section of the gas pipeline. The analysis of statistical data on emergency situations at gas pipelines. The main factors and causes of accidents are identified. The analysis of hazardous substances transported through the pipeline. Measures to reduce the risk of accidents are proposed

Comparison of 1.0 M gadobutrol and 0.5 M gadopentate dimeglumine-enhanced MRI in 471 patients with known or suspected renal lesions: Results of a multicenter, single-blind, interindividual, randomized clinical phase III trial

The purpose of this phase III clinical trial was to compare two different extracellular contrast agents, 1.0 M gadobutrol and 0.5 M gadopentate dimeglumine, for magnetic resonance imaging (MRI) in patients with known or suspected focal renal lesions. Using a multicenter, single-blind, interindividual, randomized study design, both contrast agents were compared in a total of 471 patients regarding their diagnostic accuracy, sensitivity, and specificity to correctly classify focal lesions of the kidney. To test for noninferiority the diagnostic accuracy rates for both contrast agents were compared with CT results based on a blinded reading. The average diagnostic accuracy across the three blinded readers ('average reader') was 83.7% for gadobutrol and 87.3% for gadopentate dimeglumine. The increase in accuracy from precontrast to combined precontrast and postcontrast MRI was 8.0% for gadobutrol and 6.9% for gadopentate dimeglumine. Sensitivity of the average reader was 85.2% for gadobutrol and 88.7% for gadopentate dimeglumine. Specificity of the average reader was 82.1% for gadobutrol and 86.1% for gadopentate dimeglumine. In conclusion, this study documents evidence for the noninferiority of a single i.v. bolus injection of 1.0 M gadobutrol compared with 0.5 M gadopentate dimeglumine in the diagnostic assessment of renal lesions with CE-MRI