Economic criteria for optimizing the number and load factor of mining transformers
D. Pasculescu1, L. Pana1, V.M. Pasculescu2, F. Deliu3
1University of Petrosani, Petrosani, Romania
2National Institute for Research and Development in Mine Safety and Protection to Explosion – INSEMEX, Petrosani, Romania
3“Mircea cel Batran” Naval Academy, Constanta, Romania
Min. miner. depos. 2019, 13(2):1-16
https://doi.org/10.33271/mining13.02.001
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ABSTRACT
Purpose. This article discusses how to choose the optimal number and load factor, respectively the economic power in the first year of mining power transformers operation. The analysis is carried out based on technical-economic criteria. In this regard, two economic criteria are proposed for a detailed analysis, namely the minimum updated total expenses criterion and the minimum power and energy losses criterion.
Methods. For determining the number and the optimal load factor, the paper presents mathematical models for the two eco-nomic criteria used. The results obtained by the presented methods are simulated using Matlab for several series of under-ground mining transformers. Also, it is assumed that the load remains constant over the year.
Findings. The article confirms the possibility of using the analyzed economic criteria for establishing the optimal number of mining transformers as well as the optimal load factor, respectively the optimal power for the first year of operation. The difficulty of the research is related to the loss time assessment. Also, the paper presents the performed comparative analysis of the two implications.
Originality.This research provides a novel approach, by the detailed presentation of the two criteria used for describing the objective functions which have to be minimized in order to gain the optimum, referring strictly to mining transformers, which represents a novelty for power engineering in mining.
Practical implications. The methods described in the article can be successfully used in the case of new mining power networks which are going to be designed, and in the case of those currently in operation. Economic criteria analysed also provide results for the economical regime of mining transformers which corresponds to minimum energy loss. Therefore, this case also results in significant energy savings, i.e. lower economic criteria used.
Keywords: economic criteria, load factor, loss time, mining transformer, optimal power
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