Abstract. The method of searching the damaged feeder was improved by alternate disconnecting of feeder circuit-breakers, which allow to enlarge reliability of the systems of power supply by diminishing the number of multiple earth fault in electric network. Diminishing the number of multiple earth faults is attained by exception of switching overvoltage, because commutations of feeder circuit-breakers are carrying out when shunting circuit breaker is closed. The detection of damage in the feeder, when this method is used, is produced on the change of phase of current in the circuit of shunting circuit breaker after disconnecting of circuit-breaker of this feeder.
ДИНАМИЧЕСКИЕ ПРОЦЕССЫ В БУРОВОМ ДОЛОТЕ-РАСШИРИТЕЛЕ ДЛЯ БУРЕНИЯ КОМПЕНСАЦИОННЫХ СКВАЖИНРозглядається динамічні процеси в буровому інструменті. Приведена методика проектування бурових доліт-розширювачів для буріння компенсаційних свердловин. У методиці розглянуто вплив осьового навантаження на індентор бурового інструменту. Приведені результати промислових випробувань доліт-розширювачів для бу-ріння компенсаційних свердловин по породах V -ХІІ категорії буримості. Приведена методика розрахунку очі-куваного економічного річного ефекту від використання розроблених доліт-розширювачів.Ключові слова: долото-розширювачі, категорія буримості, коефіцієнт використання шпуру, ударна хвиля.Рассматривается динамические процессы в буровом инструменте. Приведена методика проектирования буровых долот-расширителей для бурения компенсационных скважин. В методике рассмотрено влияние осевой нагрузки на индентор бурового инструмента. Приведены результаты промышленных испытаний долот-расширителей для бурения компенсационных скважин по породам V -ХІІ категории буримости. Приведена методика расчета ожидаемого экономического годового эффекта от использования разработанных долот-расширителей.Ключевые слова: долото-расширители, категория буримости, коэффициент использования шпура, ударная волна.Examined dynamic processes in a boring instrument. The brought design technique over of borings chisels-dilators for the boring drilling of compensative mining holes. In methods расмотрено influence of axleloading is on the indenter of boring instrument. The brought results over of industrial tests of chisels-dilators for the boring drilling of compensative mining holes on the breeds of V -ХІІ of category of drillability. The brought methods over of calculation of expected экономічного of annual effect from the use of the worked out chisels-dilators.The industrial testing results in determining the following: -the mechanical drilling rate of the developed rimming bit KRSH-4-65 is 1.9 times higher than that of the rimming bit KRR-65; the wear is 1.75 times lower, the energy losses of the shock pulse are 2.3 times lower as compared with the commercial rimming bit KRR-65; -the mechanical drilling rate of the developed rimming bit KRSH-12-90 is 1.3 times higher than that of the rimming bit MP-45; the wear is 1.2 times lower, the energy losses of the shock pulse are 1.9 times lower as compared with the commercial rimming bit MP-45; -in 11 m 2 cross-section drifting with a drilling rig along the rocks of the Х -ХІІ drillability index it is advisable to apply one compensation Ø90 mm borehole drilled in one stage that ensures the increase of the borehole application coefficient from 0.92 to 1.0-1.025; -in 11 m 2 cross-section drifting with hammer hand drills along the rocks of the Х -ХІІ drillability index it is advisable to apply two compensation Ø65mm boreholes drilled in two stages ensuring the increase of the borehole application coefficient from 0.91 to 0.92-0.94; -in 5.7m 2 cross-section drifting with hammer hand drills along the rocks of the Х -ХІІ dr...
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