Perm’, Russia
Perm’, Russia

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Tyulenev M.E.,NIPO JSC | Levashov V.S.,NIPO JSC | Lebedev Yu.A.,Galurgiya JSC | Khuzin R.A.,Galurgiya JSC
Gornyi Zhurnal | Year: 2013

This article describes the brief analysis of existing systems of resonance neutral grounding. There is also given the description of system of ground fault neutralization «Ground Fault Neutralizer». The described system makes it possible to do the compensation of residual active ground fault current and is characterized by high operating speed. Capacitive component of one-phase circuit current is compensated by means of arc-suppression coil. At the same time, active component is compensated by means of inverter, which is connected to the secondary winding of reactor. The system has the following basic components: -dry-type transformer for neutral release; -dry-type or oil-type arc-suppression coil with sampled change of compensation current value; -inverter, which is functional as a compensator of residual current (reactor detuning current and active component of one-phase ground fault current); -microprocessor control system, which realizes the functions of transmitter control, resonance reactor adjustment, inverter control and localization of one-phase ground fault. The considered system makes it possible to provide the qualitatively new level of electrosecurity in high-voltage distribution systems, and to provide the uninterrupted operations with established short circuit to the moment of reveal of the place of short circuit. The function of definition of distance to the place of faultiness rise is additional function of the considered system.

Kandakov Ya.V.,Galurgiya JSC | Khuzin R.A.,Galurgiya JSC | Lebedev Yu.A.,Galurgiya JSC
Gornyi Zhurnal | Year: 2014

Electric supply of all potassium mines of Verkhnekamskoe potassium salt deposit is realized by lines with 6 kW voltage, using isolated neutral. Distribution of electric energy to collectors is realized by cable lines. Nowadays, the length of excavations from shafts to most removed sites of shaft fields on some mines reaches 17 km. Earthing grid (including common ground and additional grounding loops) was laid by all excavations. Common ground consists of steel wire armoring and current installing (lead) sheaths of armored cables and grounding veins of flexible cables (independently from the stress value), which are continuously electrically connected between each other and adjoined to main grounders. Local grounders in conditions of potassium mines are not placed because of high specific resistance of rocks. With considering removement of collectors from main grounders (grounder near the shaft on mine surface and tubing support of one of shafts), it is rather complex to provide the required resistance of grounder. Observance of requirements of Unite Safety Rules and complete resistance of grounder in some cases does not allow to provide the electrosecurity in the time of appearance of one-phase earth connection. In connection with this, there was offered to carry out the regulation of incomplete resistance of grounder, but maximum permissible values of contact voltage. For this purpose, there were detaily considered the basic and additional grounding contours, constructed on "Uralkaliy" JSC mines. There were created the dependences of complete resistance of steel circle to alternating current with frequency of 50 Hz. According to this, induction resistance in all range of current densities is near 56.5 % of active resistance. The similar dependences were obtained for cables, made of lead and additional grounding vein. There was considered the scheme of inclusion of person in electric circuit in the time of damage of additional grounding contour. There was defined, that the most dangerous situation appears in the time of disturbance of connection of additional grounding line with electrical installation.

Filling of slime storage is defined by accumulation of solid phase of slimes in it. Size of sediment pond feels the seasonal and perennial changes, but has no clear tendency of accumulation of salt brines. Size of drains, placed into the slime storage, is spent on filtration, excluding the pumping out of recycle salt brines and their accumulation in voids of slime sediments. During the exploitation of slime storages, the main ecological problems are connected with discharging of part of filtration flow in surface drainage system. The higher is density of filtrated solid phase, the lower is the discharging coefficient into the surface drainage system, and vice versa. Control of filtration consists in limitation of "filtration basis" by the following ways: -minimization of water escapes (first of all, due to decreasing of addition of fresh water in technological processes to 5-6 m3 for 100 t of ore); -increasing of density of salt brines in slime storage (due to decreasing of inflow of fresh surface waters); -provision of relatively proportional filtration mode (particularly, by random screening of bed in the areas of possible blowout piping). Design documentation on preparation and antifiltering protection of slime storage bed should be developed, taking into account the results of engineering surveys, geophysical researches and hydrogeological modeling. Technological process of passing of contaminated drains (salt brines) through the slime storage with partial drainage provides their purification in several stages (due to ion exchange and sorption with filtration through rocks).

Soloviev V.A.,Galurgiya JSC | Sekuntsov A.I.,Galurgiya JSC
Gornyi Zhurnal | Year: 2015

Based on the analysis of data of chronometration observations, the authors state low action time utilization coefficient and essential slack in cutter-loader productivity in underground mines of Verkhnekamskoe deposit, both in development heading and stoping, mainly due to piecemeal operation of the key components of the process flow. In connection with this, the authors describe new engineering solutions in terms of technology and equipment, that are substantiated and put forward for the purpose of maximum possible timing and optimization of the whole cycle of cutting and hauling of sylvinite ore in cutter-loader faces. The article presents a new strategy for preparation of sylvinite stopes, which enables substantial reduction in roadway development and time spent for construction of development headings. According to the proposed method, all development headings are driven in mineral beds under mining. The offered engineering solutions are based on the use of expending belt conveyors that, alongside with the 2 times reduction in the amount of the development drivage in a stope, permits abandoning drivage of cross-strata headings in underlying rock salt. The developed engineering solutions involve the use of a loading-and-hauling system, including an expending belt conveyor and a self-propelled mechanized measuring hopper. Before long, the first models of the developed mining equipment will undergo pilot tests.

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