By N. Marinovic
Either mining and electric engineers have to keep in mind the next particular standards of electric functions in mining. 1) economic climate of electric plant and gear when it comes to the associated fee rate of the extracted mineral ores, ruled through the categorical exploitation stipulations, 2) Reliability of electric plant and gear for extractive operations, operational potency, and plant and team of workers safeguard. three) designated safeguards to counteract the extra dangers posed by means of electrical energy, and via electric phenomena as a rule. The publication has been written alongside those traces, facing these issues which spotlight the facets of electric engineering of relevance for mining engineers and elements of mining operations engineers want, to satisfy the above-mentioned simple requisites governing the advent and use of electric vegetation and platforms in mines. This ebook is meant as a textual content publication and may be of use to scholars, and faculties in addition to to mining and electric engineers
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Extra resources for Electrotechnology in Mining
35, allows for line suspension on insulators without affecting the sliding of the trolley along the line. The line should preferably have a flexible suspension, that is, it should be attached to a bracing steel rope fixed perpendicularly to the trolley line, as illustrated in Fig. 36. Fig. 36. Trolley line suspension. Trolley system 49 rubber is wedged onto the conductor trolley conductor split rubber overlay Fig. 37. Trolley line insulation. 2 m above the rails. 8 m. The trolley line may also be insulated, in which case the trolley must also be of special design, as shown in Fig.
Operation. In such installations, this type of protection requires particular care 48 Electrical equipment and power supply systems for mines Fig. 35. Trolley line cross-section. because locomotive starting and short-circuit currents often differ very little, if at all. , the short-circuit current increase curve is much steeper than that of the locomotive starting current. Protection from short circuits in the network, provided by a special monitoring device (K), relies precisely on this feature.
Trolley system rectifier (three-phase bridge arrangement): P is protective circuit breaker; M is circuit breaker motor drive; I is current-controlled overload protection; K is short-circuit protection controlled by the rate of current increase; n is voltage tripping device of the circuit breaker; PU is automatic re-start unit with block after one to three starts. locomotive is equipped with trolleys (pantographs) which slide along the trolley line and supply current to the driving motors. The current then flows back along the rails to the rectifier station.