Monitoring of the Insulation Resistance of the Power Supply Buses of Autonomous Objects

More than 70 % of the load in metallurgy, mining, gas, and other industries of the CIS consist of asynchronous motors. A relevant objective for all enterprises is to reduce consumption of reactive power in the network and ensuring reliable start of the engine by controlling the resistance value of the insulation. The most effective measure for reactive power compensation is placing the capacitor batteries directly at the points of connection of the asynchronous motor i. e. local reactive power compensation. The aim of the present research was to reduce the cost of production of the enterprise (which provides reactive power compensation), and in the period of technological pause to use the power stored in the capacitor to batteries in order control the changes of resistance value of insulation. After disconnecting the motor from the mains and its stop, the windings is being connected in parallel to the capacitor bank. The discharge of the capacitor is performed in the circuit consisting of the inductance of the motor winding, the integrated insulation resistance and battery capacity. Characteristic features of the transitional discharge process of the capacitor depend on the size of the equivalent circuit elements. The transition process may be aperiodic and periodic in its nature. Aging of motor winding causes a decrease of its impedance. When the magnitude of the insulation resistance reaches a critical value, this causes a change of the nature of the process. The device that has been developed monitors the insulation condition of the motor and the power supply cable during technological pauses without the low voltage power source and additional switching.

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Comparative analysis of multilevel converter schemes for power supply systems of autonomous objects

2016 17th International Conference of Young Specialists on Micro/Nanotechnologies and Electron Devices (EDM) ◽

10.1109/edm.2016.7538770 ◽

2016 ◽

Author(s):

Alexander G. Volkov ◽

Dmitry A. Shtein ◽

Denis V. Makarov

Keyword(s):

Comparative Analysis ◽

Power Supply ◽

Multilevel Converter ◽

Autonomous Objects ◽

Supply Systems

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Mathematical modeling of a system for monitoring the insulation resistance of a high-voltage power grid of a hybrid vehicle

Izvestiya MGTU MAMI ◽

10.31992/2074-0530-2021-47-1-89-98 ◽

2021 ◽

Vol 1 (1) ◽

pp. 89-98

Author(s):

A.N. Malyshev ◽

◽

YE.A. Grunenkov ◽

V.V. Debelov ◽

V.N. Kozlovskiy ◽

...

Keyword(s):

Mathematical Modeling ◽

Monitoring System ◽

High Voltage ◽

Power Supply ◽

Power Grid ◽

Hybrid Vehicle ◽

Insulation Resistance ◽

Insulation Monitoring ◽

Hardware Complex ◽

Software And Hardware

The paper presents mathematical models and computational and analytical dependences, which make it possible to implement a system for monitoring the insulation resistance of a high-voltage power grid of a hybrid vehicle and make it possible to formulate requirements for the physical and simulation model of the software and hardware complex of laboratory tests. The purpose of the work is to determine the main functions and characteristics of the insulation monitoring system, its features, the principle of operation and methods of monitoring the insulation resistance, drawing up requirements for the simulation system. The introduction justifies the importance of monitoring in-sulation resistance and provides references to standards that regulate the requirements for the meas-urement and determination of mains failure. The block diagram of the vehicle power supply and the role of the insulation resistance monitoring system in this diagram are presented, the features of in-sulation monitoring are explained. The principle of operation of the insulation monitoring system and the use of the most common schemes are considered. The calculated dependencies for each of the presented schemes are given. These allow calculating the insulation resistance. The procedure for measuring the insulation resistance according to the ISO standard is described and the corre-sponding equations are given. For the presented circuit, a graph that explains the principle of the system's operation, when one of the keys is closed, the voltage across the measuring resistor changes with the normal insulation state of the positive and negative power supply bus of the high-voltage system is given. The conclusions provide a generalization of the presented mathematical model and formulate the requirements for the software and hardware complex, which allows simulation and mathematical modeling of electrical systems and their components in various operating modes. The paper explains the features of the software and hardware complex that allows to simulate changes in the insulation resistance and faults of the high-voltage power supply network for a vehicle with a hybrid power plant.

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Energy efficiency of electrical equipment systems of autonomous objects

10.12737/1740252 ◽

2021 ◽

Author(s):

Sergey Zuev ◽

Ruslan Maleev ◽

Aleksandr Chernov

Keyword(s):

Energy Efficiency ◽

Power Supply ◽

Power Plants ◽

Power Supply System ◽

Motor Vehicle ◽

Combustion Engine ◽

Supply System ◽

Motor Vehicles ◽

Electrical Network ◽

Autonomous Objects

When considering the main trends in the development of modern autonomous objects (aircraft, combat vehicles, motor vehicles, floating vehicles, agricultural machines, etc.) in recent decades, two key areas can be identified. The first direction is associated with the improvement of traditional designs of autonomous objects (AO) with an internal combustion engine (ICE) or a gas turbine engine (GTD). The second direction is connected with the creation of new types of joint-stock companies, namely electric joint-stock companies( EAO), joint-stock companies with combined power plants (AOKEU). The energy efficiency is largely determined by the power of the generator set and the battery, which is given to the electrical network in various driving modes. Most of the existing methods for calculating power supply systems use the average values of disturbing factors (generator speed, current of electric energy consumers, voltage in the on-board network) when choosing the characteristics of the generator set and the battery. At the same time, it is obvious that when operating a motor vehicle, these parameters change depending on the driving mode. Modern methods of selecting the main parameters and characteristics of the power supply system do not provide for modeling its interaction with the power unit start-up system of a motor vehicle in operation due to the lack of a systematic approach. The choice of a generator set and a battery, as well as the concept of the synthesis of the power supply system is a problem studied in the monograph. For all those interested in electrical engineering and electronics.

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