Problem. Cleaning transformer oil is one of the important engineering tasks, whose solution is associated with significant material and energy expenditure. Due to the increase in electricity consumption at modern automobile companies (firms, organizations, service stations, etc.), the load on transformer substations increases and the requirements for reliability of electrical and electronic devices become more complicated. This, in turn, leads to the problem of cleaning and recycling of transformer oil. Goal. The goal is the research and development of an efficient unit for centrifugal cleaning of transformer oil with a drive control system that provides automation of the start and braking mode of the drive. Methodology. Analytical methods of research, methods of the theory of electric machines and electric drives are used, as well as the methods of calculating electric circuits. Also, methods of analysis of circuits and control of power electronics devices, principles of operation and methods of control of static converters are used. Results. The structural scheme of the unit for cleaning transformer oil is developed. The calculations of the main elements of the power block of the transformer oil cleaning unit are performed. The block diagram of the voltage converter with frequency f = 50 Hz to alternating voltage with frequency f = 400 Hz is developed. Control circuits of the electric drive of the centrifugal separator are chosen. The analysis of operation of electric drive control circuits is carried out and the principles of their work concerning two components are considered: the regulated rectifier and the inverter. Originality. The scheme of the converter of alternating three-phase current with voltage of 220 V and frequency of 50 Hz, into alternating three-phase current with voltage of 220 V and frequency of 400 Hz is developed. This frequency, in addition to providing the necessary characteristics of the oil separator, allows you to develop a converter device of a relatively small weight and volume, and also provides its high reliability. Practical value. Utilizing the used transformer oil in this way will solve several problems at once. It is possible to reduce the initial production of transformer oil. The issue of waste oil disposal is being resolved leading to the solution of the environmental aspect of this problem. All this will reduce the cost of oil poured into transformers and the operating cost of transformer substations.
Annotation. Problem. The reduction of reliability, economical and mass-dimensional indicators is one of available ways for centrifugal cleaning transformer olives installations, which based on electric drives with icreased frequency. In addition to the development and calculation of the power scheme of the installation, the issue of developing an calculation power supply system from the industrial power system is relevant. In this case, the task of developing and researching a voltage and frequency converter, which is an intermediate link between the industrial power system and the centrifugal oil cleaning installation and provides the specified parameters of electricity, requires the solution of additional partial problems. Goal. The goal is to develop and study the functional scheme of the transformer-rectifier unit with an automated output voltage control system for the installation of centrifugal cleaning of transformer oil. Methodology. Analytical methods of research, methods of the theory of electric machines and electric drives, and also methods of calculation of transfer functions of elements of the automated control systems and their dynamic characteristics are used. Results. The structural scheme of the transformer-rectifier unit with the automated control system of the output voltage of the installation for cleaning transformer oil on the basis of the electric drive of the increased frequency is developed. Calculations of transfer functions of elements of the offered automated control system of the transformer-rectifier unit are executed and its dynamic characteristics are investigated. Originality. The scheme of the transformer-rectifier unit for installation of centrifugal cleaning of transformer oil with the electric drive of the increased frequency is developed and investigated. Practical value. The introduction of centrifugal transformer oil cleaning units with a high-frequency electric drive will increase the reliability, economy and weight of such units. The calculations allow us to draw conclusions about the compliance of the proposed scheme of the transformer-rectifier unit with an automated voltage control system for reliability and dynamic characteristics of the requirements for the secondary power supply of the centrifugal oil cleaning installation.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.