نتایج جستجو برای: phase to ground faults
تعداد نتایج: 10815997 فیلتر نتایج به سال:
A considerable amount of energy is released in the form of shock wave from explosive charge detonation. Shock wave energy is responsible for the creation of crushing and fracture zone around the blast hole. The rest of the shock wave energy is transferred to rock mass as ground vibration. Ground vibration is conveyed to the adjacent structures by body and surface waves. Geological structures li...
This paper proposes a simple and effective method for classification of fundamental ferroresonance, single phase-to-ground and wire breakage over-voltages. In isolated neutral networks, power frequency over-voltages due to ferroresonance, single phase-to-ground and wire breakage may exist for a long time, and have very highly similar voltage features. If the improper suppression operation is ap...
most specialists in the field of foreign language teachingconsiderreading skill as an interactive process between the reader’s prior knowledge and the text.accordingly, the activation of prior knowledge for an effective comprehension is very important. it is generally agreed that the pre-reading phase is the stage where this type of interaction and activation may be enhanced throughcertain stra...
In this paper, a novel design and development of a fuzzy logic controller using static synchronous series compensators (SSSC) to damp out the swinging oscillations in a FACTS based integrated multi-machine power system when a three-phase line to line ground fault takes place at one of the generators in the power system is proposed. The multi-machine power system considered consists of three gen...
thermal barrier coatings (tbcs) are used to provide thermal insulation to the hot section components of gas turbines in order to enhance the operating temperature and turbine efficiency. hot corrosion and thermal shocks are the main destructive factors in tbcs which comes as a result of oxygen and molten salt diffusion into the coating. in this thesis atmospheric plasma spraying was used to dep...
all analytical methods are generally based on the measurement of a parameter or parameters which are somehow related to the concentration of the species.an ideal analytical method is one in which the concentration of a species can be measured to a high degree precision and accuracy and with a high sensitivity. unfortunately finding such a method is very difficult or sometimes even impossible.in...
Abstract: Transmission lines are used to transmit electric power for large distances in electrical power systems. The rapid growth of electrical power systems over the past few decades has resulted in a massive increase of the quantity of lines operative and their total length. These lines are exposed to faults as a result of lightning, short circuits, faulty equipment‟s &human errors. This pap...
AbsuudThe falllt aulysis is doae for the three phase sym••etric2I fa.at •• d die a~ halts.. TlIe unsymmetrical faults include siagie _ to grouod., tiBe to liDeaJIddoable tiae to grouad &lilt. llae metllod employed is bllS i_pedaatt matrix wIIidt bas certain advantages over tlleveaUa's equivaleat _dbocL The advautage of this approach over coaveatioeal metllod is to make the analysis of three typ...
A restricted earth fault (REF) protection element provides sensitive detection of ground faults near the neutral a transformer or generator. The sensitivity gains from REF are especially more valuable when equipment is low-impedance grounded phase differential (87T) ineffective. However, faces several challenges in systems, which becoming prevalent inverter-based resource (IBR) plants. Dependab...
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