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DOI: http://dx.doi.org/10.20534/AJT-16-9.10-72-75
Siddikov Ilkhomjon Khakimovich, Tashkent University of Information Technologies, Head of the chair «Power supply systems» E-mail: ikhsiddikov@mail.ru Sattarov Khurshid Abdishukurovich, Tashkent University of Information Technologies, Ass.Prof., of the chair «<Power supply systems» E-mail: sattarov.khurshid@mail.ru
The transducers of the primary current to secondary voltage with flat measuring windings for combined control of reactive power
Abstract: Purpose of research is development of theories and designing the electromagnetic transducers one and multi-phases primary current to secondary voltage with flat measuring windings for multifunction control source of reactive power and creation of their base of power and resource saving in power systems. The classical methods of research of the magnetic circuits do not provide necessary accuracy due to the asymmetries of the three-phase primary currents of electric network, which do not possess the sufficient generality, covering here with only main varieties of the circuits of electric and magnetic nature.
Keywords: magnetic circuit, accuracy, electric nets, magnetic system, non-linear parameter, electromagnetic transducers, primary current, secondary voltage, reactive power, power and resource saving, power systems.
The development of the complex approach, providing with concentrated parameters. The Complex analysis of
power and resource saving on base of efficiently control sources of reactive power, expansion of the functional possibilities, simplification of designs, reduction ofweight and volume factors, improvement of the technologies of fabrication, provision of the remote measuring processes, transformation of the current based on the usage of the modern primary measuring transducers is actual problem of the control devices and elements of power system.
Herewith, the primary measuring current transducers, being the main section information-measuring and controlling systems, completely define the technical and economic factors of power system. At present employment of the electromagnetic transducers of three-phase current with unified output value, expansion ofthe spectrum converted electric values is limited, because ofthe insufficient development ofthe methods of calculation and research of portioned magnetic systems of the transducers.
The classical methods of research of the magnetic circuits do not provide necessary accuracy due to the asymmetries of the three-phase primary currents of electric network, which do not possess the sufficient generality, covering here with only main varieties of the circuits of electric and magnetic nature. The magnetic systems of the transformation with non-linear parameters and features of the primary current of electric network of power system during calculations have been taken as an object
the elements and control system of source of reactive power and their mode, principle of their buildings, is indicative of insufficient research of problems in the field of electromagnetic transformation current and combined control of source of reactive power of power system. However shaping the priority methods of the contraction and researches of the electromagnetic transducers of the primary current in secondary voltage, providing adequacy of the value of the output voltage to primary current, algorithm of three-phase current in system of multifunction control reactive power systems require undertaking comprehensive research. This circumstance is connected with greater inaccuracy at transformation of the values primary current power systems, which bring about irrational use the sources to electric powers, obstruct checking and control mode their work, bring about excessive financial loss of powers.
The System analysis of the electromagnetic transducers of primary current has allowed also to install that classical designs of the transducers of the current managerial system by reactive power — a transformers of the current provide on output current by value 5 A under nominate of primary, have: restriction on range of the converted current; significant inaccuracy; complex and non-technological to designs; the greater size; the mass; specific consumption of materials and cost.
The Fact just cited limited using the classical electromagnetic transducers of the current in corresponding to managerial system of the values and parameter of the electric networks. So development, study and practical introducing the electromagnetic transducers with flat measuring winding primary one and three-phase current in secondary voltage with extended functional possibility and unified output value, taking into account non-symmetry of three-phase current and creation on their base of the systems of multifunction control reactive power is a decision of the problem of the improvement and developments existing technologies of control value and parameter of powers is actual problem of the power system.
Purpose of research the development of theories and designing the electromagnetic transducers one and multi-phases primary current to secondary voltage with flat measuring windings for multifunction control source of reactive power and creation of their base of power and resource saving in power systems.
In the fig.1. presented of the electrical network of power system with combined auto-control system of devices of production, transmissions, distribution and consumptions to reactive electric power [1].
In the tabl.1 references of electromagnetic transducer of the current to voltage, are classified main forms of the flat measuring windings and motivated formulas for determination area sections S different flat measuring windings. The Analysis of the conditions of the functioning the transducers of the current and requirements have shown that in power system it is advisable to use the electromagnetic transducers of the current and voltages with flat measuring windings and development principle transformations and design electromagnetic transducers of the current and voltages with flat measuring windings three-phase electric network, providing account non-symmetry, unification of the output values and possessing extended functional possibility for multifunction control source to reactive power of power system.
Figure 1. Functional scheme of the combined auto-control sources of reactive power of power system
A1, A2, A3 - an automatic breakers, KM1, KM2, KM3 - an commutation devices; CC - a block of current compensation; LO - logical organ; U1, U2 - an amplifiers; KT1, KT2 - an elements of the endurance on time; Kl1, Kl2 - an executive organs; CO - a control organ - BMC -bloc of microprocessors control - a digital automatic regulator of the source of reactive power; EM - a synchronous
machine (the generator, motor and synchronous compensator), KKU - a source of reactive power - cosines capacitors installation, EMTCV with FMW and EMCV - an electromagnetic transducers ofthe current to voltage with flat measuring windings.
Figure 1. Functional scheme of the combined autocontrol sources of reactive power of power system
Table 1. - The Principle of the design of flat measuring windings for electromagnetic transducers the current to voltage
№
Type of flat measuring windings
Form of flat measuring windings
Area of the section
2
4
1.
Triangular
Stt =ab/2
1
3
2
4
Square-wave
S = kab
sq
3.
Round
S = knD /4
The principle of construction of the electromagnetic winding for combined auto-control of source of reactive transducers of the current to voltage with flat measure power of power system given in figure -2 and 3 [2-3].
1, 2, and 3 - FMW, 4, 5 and 6 - insulation plates, 7,8 and 9 - additional Cores, 10 and 11, 12 and 13, 14 and 15 -pairs if parallel cterjens,16- base of core, 17, 18 and 19-primary windings
Fig.2 The Electromagnetic transducers of the current to voltage with flat measure winding with three magnetic cores
(Patent RUz № 04185)
In the fig. 4 given the principle schemes of the electromagnetic transducers of the current to voltage with flat measure winding for combined auto-control of source of reactive power of power system.
Conclusion
Motivated, that using of the flat measuring windings in electromagnetic transducer of current to voltage as detector elements, provides unified out signal with parameter: voltage — 20 V, current — 100 mA and allows develop of construction a new electromagnetic transducer of the current to voltage with flat measuring windings, being up to quality of combined auto-control system of reactive power of power systems.
1, 2, 3 and 4 - FMW, 5 - insulation plates, 6, 7, 8 and 9 -four Cores, pairs 10 - base of core, 11 - core, 12 (phase A), 13 (phase B) and 14 (phase C) - primary winding
Fig.3. The Electromagnetic transducers of the current to voltage with flat measure winding and four magnetic cores
(Patent RUz № 04475)
Installed that influence of the secondary current e t flat measuring windings of the current
out O O
to voltage transducers of the forms 0,017% from normalized importance in primary current ein. When change a temperature surrounding ambiences, inaccuracy of the transformation increases 0,03%, wrong fabrication form flat measuring windings — 0,07%. Accounting entropy inaccuracy of the transducers of the current to voltage does not exceed 0,2%, but experimental importance of inaccuracy electromagnetic transducer of the current to voltage with flat measuring windings forms 0,21%.
1
3
Fig.4. The principle schemes of the electromagnetic transducers of the primary current to secondary voltage with flat measure winding for combined control of source of reactive power of power system
References:
1. Siddikov I.Kh., Khakimov M.Kh., Anarbaev M., Bedritskiy I. M., Research of the electromagnetic transducers of the primary current to secondary voltage//Science and Education. Materials of the II International Research and practice conference. Vol. I, Publishing office of «Vela Verlag Waldkraiburg», Munich, Germany, December, -18-19, - 2012. - P. 222-225.
2. Amirov S. F., Azimov R. K., Siddikov I.Kh., Khakimov M.Kh., Khushboqov B.Kh., Sattarov Kh., A. Patent RUz. № 04185. The Transducer of the non-symmetry of three-phases current//Patents Agency of RUz, Byul. - 2010. - № 6.
3. Azimov R. K., Siddikov I.Kh., Kurbanova M. J., Anarbaev M. A., Siddikov O. I., Mamatkulov A. N. Patent RUz. № 04907. The transducer of the current//Patents Agency of RUz, Byul. - 2014. - № 6.
