Abstract
The theme of the article is justified by the situations arising in the process of slurry pumping station operation accompanied by the increasing frequency of electrical equipment flooding, which is the reason for the reconstruction. It should be noted that it is necessary to find the solution for the increase in the redundancy level are the accidents when the slurry pump station is completely without power supply or the long-time switching to the reserve input due to the delay made by the personnel. Such causes result in significant losses due to flooded electrical equipment due to power failure and the pump house being underground as well as stopping the technological process of continuous production of a large shop for several days. The purpose of this investigation is to find the optimum design solution for a slurry pumping station under specific industrial conditions considering its location and operating conditions in the process of operation. To solve the problem of the pumping station flooding, the choice of electric power supply schemes, in which reliability and redundancy will be increased, is offered. The scheme choice is based on a complex approach considering the reliability parameters, reduction of downtime and losses, estimate of steady-state parameters, emergency and post-emergency modes, as well as no-risk, prospect for expansion of the pump house and approximate economic evaluation of the suggested solutions. Some circuit solutions are implemented in Katran software package based on a combination of modified equivalence and sequential intervals methods to determine the values of steady-state parameters of the system as well as to calculate the emergency closing at 10 kV sections to estimate post-emergency parameters and to further implement them. The design of power supply schemes for reconstruction of a slurry pumping station with the purpose of increasing the reliability of uninterrupted power supply to responsible consumers to increase the degree of object reservation was carried out in this work. The authors suggest scheme variants and estimate the possibility to realize them in the conditions of the present object. Besides, a tentative evaluation of reliability and safety of the presented power supply schemes with reference to conditions of the oxygen-converter plant is given. Their comparison is made, and it is described, which of the schemes may be used in practice. Their economic component and convenience are also evaluated. In addition, steady-state, emergency, and post-emergency mode have been calculated in order to study the reliability of the optimal scheme.
Keywords
power supply scheme, reliability, slurry pump house, reliability categories, power supply quality, voltage level calculation, redundancy, pump house flooding, losses, additional backup input
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