Contactless wide-range ferromagnetic high-current converters for monitoring and control systems in the electric power industry

The paper shows that the impossibility of breaking the current circuit for the production necessity of temporarily switching on electrical measuring instruments, large power losses on shunts, and the need to obtain quick information about the quality of the functioning of technological processes have led to the widespread use of non-contact conversion and measurement of high direct currents in circuits without breaking them. Light detachable wide-range stationary and portable non-contact transducers and meters of high direct currents are not yet mass-produced. In this regard, it is expedient to develop and study non-contact converters and meters of high direct currents, which are distinguished by a wide range of converted currents, small dimensions and weight, increased accuracy, and sensitivity of electric power facilities. The questions of sensitivity of magneto-modulation non-contact transducers are considered. The expression for the optimal static characteristic of the developed magneto-modulation non-contact transducer is determined and analyzed. Its maximum deviation from the calculated value does not exceed 6%. The expressions for the current, average sensitivity, and sensitivity regarding the magnitude of the excitation of a magneto-modulation non-contact transducer are obtained and investigated. In this case, the maximum sensitivity of the transducer reaches a value of 0.425 with an optimal excitation value of 1.65. It is recommended to take the allowable limit of the input value of the converter to be less than one. Its input value must be taken equal to 0.7. The developed magneto-modulation non-contact transducer has an increased sensitivity due to longitudinal modulation. It can be widely applied in control and management systems in melioration and irrigation, water supply, industry, metallurgy, railway transport, science, technology, GIS technology, and, in particular, digital coverage and database visualization, and as well as for checking electric meters at the place of their installation for non-contact control of direct, as well as alternating currents

High-current contactless ferromagnetic converters for multi-profile monitoring and control systems

The article shows that the undesirability of breaking the current circuit for the temporary inclusion of electrical measuring devices, the presence of large power losses on shunts, the impossibility of breaking the circuit under the conditions of the technological process, as well as safety requirements caused contactless conversion and measurement of large DC currents in circuits without breaking them in metallurgy, electrochemical industry, railway transport, in laser technology, renewable energy sources, land reclamation, irrigation and in general in agriculture. Lightweight detachable wide-band stationary and portable non-destructive contactless converters and meters of large direct currents are not yet mass-produced worldwide. Therefore, it is very important to develop and study contactless converters and meters of large direct currents, having an extended range of converted currents with small dimensions and weight and increased accuracy and sensitivity, a simplified and technologically advanced design with low material consumption and cost, and the ability to convert both constant and variable high currents and fixed sensitivity control. All these requirements are met by the effective multifunctional magneto-modulating contactless converters of large direct currents developed by us. The results of the development of one of them are given in the work. The issues of its dynamics are considered. The results of his research are shown. It was found that the transition time for him is 0.025 of the period of the industrial frequency. Therefore, it can be considered practically inertia-free. The developed effective multifunctional magneto-modulating contactless converter can be widely used in monitoring and control systems in water supply, land reclamation, and irrigation, industry, railway transport, metallurgy, science, technology for contactless monitoring of constant and alternating currents, as well as for checking electric meters at the place of their installation

Universal contactless converters of monitoring and control systems in water power industry

The paper substantiates the need to use non-contact conversion and measurement of large direct currents using non-destructive magneto modulation non-contact ferromagnetic transducers of increased sensitivity for the needs of land reclamation, irrigation, industry, metallurgy and, in general, agriculture and water management; the results of their design development are presented. It is shown that the developed converter, in contrast to the known ones, has increased accuracy and sensitivity, a technologically advanced design and small weight and dimensions with low material consumption and cost. The issues of reliability of magnetic modulation contactless converters are considered. The results of their research have been obtained. It is shown that the reliability of wide-range magneto modulation contactless converters of large direct currents is equal to 0.998 and taking into account catastrophic failures, their total reliability is 0.9969. The developed converter can be widely used in electrical systems in land reclamation and irrigation, in water supply, industry, railway transport, science, technology and for checking electrical meters at their installation site

High-current contactless ferromagnetic converters for multi-profile monitoring and control systems

The article shows that the undesirability of breaking the current circuit for the temporary inclusion of electrical measuring devices, the presence of large power losses on shunts, the impossibility of breaking the circuit under the conditions of the technological process, as well as safety requirements caused contactless conversion and measurement of large DC currents in circuits without breaking them in metallurgy, electrochemical industry, railway transport, in laser technology, renewable energy sources, land reclamation, irrigation and in general in agriculture. Lightweight detachable wide-band stationary and portable non-destructive contactless converters and meters of large direct currents are not yet mass-produced worldwide. Therefore, it is very important to develop and study contactless converters and meters of large direct currents, having an extended range of converted currents with small dimensions and weight and increased accuracy and sensitivity, a simplified and technologically advanced design with low material consumption and cost, and the ability to convert both constant and variable high currents and fixed sensitivity control. All these requirements are met by the effective multifunctional magneto-modulating contactless converters of large direct currents developed by us. The results of the development of one of them are given in the work. The issues of its dynamics are considered. The results of his research are shown. It was found that the transition time for him is 0.025 of the period of the industrial frequency. Therefore, it can be considered practically inertia-free. The developed effective multifunctional magneto-modulating contactless converter can be widely used in monitoring and control systems in water supply, land reclamation, and irrigation, industry, railway transport, metallurgy, science, technology for contactless monitoring of constant and alternating currents, as well as for checking electric meters at the place of their installation

Contactless wide-range ferromagnetic high-current converters for monitoring and control systems in the electric power industry

The paper shows that the impossibility of breaking the current circuit for the production necessity of temporarily switching on electrical measuring instruments, large power losses on shunts, and the need to obtain quick information about the quality of the functioning of technological processes have led to the widespread use of non-contact conversion and measurement of high direct currents in circuits without breaking them. Light detachable wide-range stationary and portable non-contact transducers and meters of high direct currents are not yet mass-produced. In this regard, it is expedient to develop and study non-contact converters and meters of high direct currents, which are distinguished by a wide range of converted currents, small dimensions and weight, increased accuracy, and sensitivity of electric power facilities. The questions of sensitivity of magneto-modulation non-contact transducers are considered. The expression for the optimal static characteristic of the developed magneto-modulation non-contact transducer is determined and analyzed. Its maximum deviation from the calculated value does not exceed 6%. The expressions for the current, average sensitivity, and sensitivity regarding the magnitude of the excitation of a magneto-modulation non-contact transducer are obtained and investigated. In this case, the maximum sensitivity of the transducer reaches a value of 0.425 with an optimal excitation value of 1.65. It is recommended to take the allowable limit of the input value of the converter to be less than one. Its input value must be taken equal to 0.7. The developed magneto-modulation non-contact transducer has an increased sensitivity due to longitudinal modulation. It can be widely applied in control and management systems in melioration and irrigation, water supply, industry, metallurgy, railway transport, science, technology, GIS technology, and, in particular, digital coverage and database visualization, and as well as for checking electric meters at the place of their installation for non-contact control of direct, as well as alternating currents

ERRORS OF UNIVERSAL CONTACTLESS CONVERTERS OF MONITORING AND CONTROL SYSTEMS FROM EXTERNAL MAGNETIC FIELDS

In communication and communication devices, power equipment, relay protection and automation terminals, in the electric power industry of smart cities and homes, in industry, in railway transport, microprocessor-based relay protection and automation devices, distributed generation installations, including renewable energy sources, and electricity storage, as well as intelligent automated information and measurement systems are beginning to be used. Contactless converters of direct and alternating currents of control and control systems are widely used in them. Their disadvantages are a narrow range of controlled currents, large dimensions and weight. Therefore, it is important to eliminate them. The paper discusses the general principles of construction of contactless converters of large direct currents, the main requirements for them, and shows the results of the development of one of the options proposed by us, universal contactless magneto-modulation converters of large direct currents with an extended range for various control and control systems. They differ from the known ones by an extended controlled range with small dimensions and weight, and increased accuracy and sensitivity. The converter has a simple and technological design with low material consumption and cost, and can control large direct currents, as well as alternating currents, without contact. The paper considers the errors from external magnetic fields of universal contactless converters of control and control systems. It is shown that the error from the external magnetic field does not exceed 0.08% if the number of sections of the measuring winding is even and with their symmetrical arrangement, and with their even increase-the error decreases. At the same time, the developed contactless converters can be widely used in industry, metallurgy, railway transport, agriculture, water and farming, as well as in the electric power industry of “smart” cities and homes and for checking electric meters at the place of their installation

Static characteristics of contactless converters of monitoring and control systems

The paper substantiates the need to use non-contact conversion and measurement of large direct currents using magnetic modulation contactless transducers of increased sensitivity for land reclamation, irrigation, industry, metallurgy and agriculture and water management in general, and the results of their design development are presented. It is shown that the developed converter, in contrast to the known ones, has increased accuracy and sensitivity, a technologically advanced design and low weight and dimensions with low material consumption and cost. Characteristics of information non-contact magnetic modulation converters statically are considered. It is shown that the value of the excitation value corresponds to a certain maximum value of the measured value. In this case, the maxima of the measured value, increasing in value with an increase in the excitation value, are shifted towards the increase in the measured value. The discrepancy between the experimentally and theoretically obtained static characteristics of the converter does not exceed 6 percent. The developed converter can be widely used in electrical systems in land reclamation and irrigation, in water supply, industry, railway transport, science, technology, and for checking electric meters at their installation site for contactless control of direct and alternating currents

Universal contactless converters of monitoring and control systems in water power industry

The paper substantiates the need to use non-contact conversion and measurement of large direct currents using non-destructive magneto modulation non-contact ferromagnetic transducers of increased sensitivity for the needs of land reclamation, irrigation, industry, metallurgy and, in general, agriculture and water management; the results of their design development are presented. It is shown that the developed converter, in contrast to the known ones, has increased accuracy and sensitivity, a technologically advanced design and small weight and dimensions with low material consumption and cost. The issues of reliability of magnetic modulation contactless converters are considered. The results of their research have been obtained. It is shown that the reliability of wide-range magneto modulation contactless converters of large direct currents is equal to 0.998 and taking into account catastrophic failures, their total reliability is 0.9969. The developed converter can be widely used in electrical systems in land reclamation and irrigation, in water supply, industry, railway transport, science, technology and for checking electrical meters at their installation site