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The proposed algorithm aims at avoiding mal-operation, possible with the conventional three-phase transformers differential protection scheme due to transient phenomena, including the magnetic inrush current, simultaneous inrush with internal fault, and faults with current transformer saturation.
Based on the results, it is observed that the overall permeability evolution during the tests can be divided into four different phases, including i) re-arrangement of large rock fragments, ii) water inrush with substantial particle migration, iii) continued moderate particles seepage, and iv) steady state water flow.
The risk assessment of the water inrush with geological flaws is conducted where the weight is set using the analytic hierarchy process (AHP) to establish the assessment models, whereas that with no geological flaws is made using the rock mass mechanics theories.
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The evaluation of the hydraulic properties evolution of granular sandstones in relation with groundwater inrush within faults is an important issue for mining engineering applications.
In starting a motor, a VFD initially applies a low frequency and voltage, thus avoiding high inrush current associated with direct-on-line starting.
A practised self-injector will slightly depress the plunger of the hypodermic, then deftly pull it a little way out, depress it a bit more, pull it out again – in so doing the barrel will become suffused with blood, while the inrush of the drugs takes place with a mounting rhythm of successive waves.
Challenges, such as cutter wear, jamming and steering difficulties in difficult grounds with water inrush, fractured and faulted zones, high in-situ stresses, and gas, are explored in depth through case histories.
"For €40 [£34] a quarter, and with the huge inrush of patients, I can only treat depression with medication".
Privately, my wife and I have been using phrases such as "getting our lives back", as if the vacuum left by the Slightly Dangerous Cot will immediately be filled by an inrush of excitable 1920s flappers arriving with gallons of martini, flagons of ether and a 25-piece jazz big band.
Actual inrush current signals of a transformer with short-circuited turns are also considered.
During coal extraction from these mines, water inrushes occur frequently with disastrous consequences.
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