Pub Date : 2020-09-01DOI: 10.1109/UralCon49858.2020.9216294
M. Kletsel’, A. Barukin, B. Mashrapov
It is noted that the use of reed switches makes it possible to solve the urgent problem of building relay protection devices without current transformers. It is emphasized that for their fastening and regulation of the response parameters of these devices by changing the position of the reed switches in the vicinity of live buses, special structures are necessary. Four new designs are offered for mounting reed switches close to AC and DC buses. The first of them differs from the known ones by the availability of a clamp covering the bus, a plate on which n reed switches are fixed and a strap fastened with this clamp. The second one differs by a double ear clamp and two rotary arcs with ratchet drums with a reed switch. The third one differs by a L-shaped plate with reed switches and mounting angles. The fourth one differs by two rectangular beams with four through holes. The article describes how to control the parameters of protections tripping on the reed switches using these structures.
{"title":"Designs for Mounting Reed Switches in Vicinity of AC and DC Buses","authors":"M. Kletsel’, A. Barukin, B. Mashrapov","doi":"10.1109/UralCon49858.2020.9216294","DOIUrl":"https://doi.org/10.1109/UralCon49858.2020.9216294","url":null,"abstract":"It is noted that the use of reed switches makes it possible to solve the urgent problem of building relay protection devices without current transformers. It is emphasized that for their fastening and regulation of the response parameters of these devices by changing the position of the reed switches in the vicinity of live buses, special structures are necessary. Four new designs are offered for mounting reed switches close to AC and DC buses. The first of them differs from the known ones by the availability of a clamp covering the bus, a plate on which n reed switches are fixed and a strap fastened with this clamp. The second one differs by a double ear clamp and two rotary arcs with ratchet drums with a reed switch. The third one differs by a L-shaped plate with reed switches and mounting angles. The fourth one differs by two rectangular beams with four through holes. The article describes how to control the parameters of protections tripping on the reed switches using these structures.","PeriodicalId":230353,"journal":{"name":"2020 International Ural Conference on Electrical Power Engineering (UralCon)","volume":"171 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124888204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-01DOI: 10.1109/UralCon49858.2020.9216257
A. Vlasov, V. Poletaev
Magnetic fluid sealers (MFS) are used for sealing rotating shafts in electric motors operating under high humidity, dust and contamination. Friction moment and heating are the most important operational parameters of the MFS, which are influenced by design and operating parameters: speed; operating time; temperature; gap, taking into account roughness and undulation. Models of gaps of magneto-fluidic sealers MFS formed by surfaces with different roughness values are obtained. The contact areas of the magnetic fluid (MF) with surfaces for MFS at different roughness values are determined. The contact area of the MF with rough wavy surfaces was determined by mathematical modeling. Experimental studies were performed at the experimental stand. Replaceable bushings and a pole made of different steels with different roughness values were used. The developed experimental setup allows us to conduct research on the impact of changes in design and operating parameters on the performance indicators of MFS.
{"title":"Research of Magnetic-Liquid Shaft Sealers of Electric Motors","authors":"A. Vlasov, V. Poletaev","doi":"10.1109/UralCon49858.2020.9216257","DOIUrl":"https://doi.org/10.1109/UralCon49858.2020.9216257","url":null,"abstract":"Magnetic fluid sealers (MFS) are used for sealing rotating shafts in electric motors operating under high humidity, dust and contamination. Friction moment and heating are the most important operational parameters of the MFS, which are influenced by design and operating parameters: speed; operating time; temperature; gap, taking into account roughness and undulation. Models of gaps of magneto-fluidic sealers MFS formed by surfaces with different roughness values are obtained. The contact areas of the magnetic fluid (MF) with surfaces for MFS at different roughness values are determined. The contact area of the MF with rough wavy surfaces was determined by mathematical modeling. Experimental studies were performed at the experimental stand. Replaceable bushings and a pole made of different steels with different roughness values were used. The developed experimental setup allows us to conduct research on the impact of changes in design and operating parameters on the performance indicators of MFS.","PeriodicalId":230353,"journal":{"name":"2020 International Ural Conference on Electrical Power Engineering (UralCon)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121378664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-01DOI: 10.1109/UralCon49858.2020.9216265
A. Karandaev, S. Baskov, O. Gasiyarova, B. Loginov, V. Khramshin
Improving the precision of calculating the model parameters of the rolling stand electromechanical system is a relevant problem. When developing models, such systems are assumed to be two-mass ones with an elastic constraint and angular gaps in the transmitting shaft line (spindle). Applying the technique for calculating the parameters of the “drive-roll” simulation model based on experimentally recorded oscillograms is exemplified by the electric drives of the reversing rolling stand at the plate mill 5000 of PJSC Magnitogorsk Iron and Steel Works. The spindle design has been considered; it is shown that gaps are most frequently formed at the coupling heads on the roll and the engine rotor sides. The drive model structure in a closed-loop speed control system is given. The approximation of the inner motor torque control loop transfer function by a second-order filter is justified. The frequency characteristics of the loop response for the disturbing effect have been studied. The oscillatory nature of the transient torque at the initial control adjustment has been proved. Processes have been simulated for shock loading and different speed control time constants. The optimal time constant variation range ensuring the reduction of oscillations in a closed-loop system is justified. The design transient torque curves are provided for the acceleration and shock loading modes at various angular gaps in the spindle joints. It is shown that at the optimal speed control setting, the angular gap affects the amplitude insignificantly. Recommendations are given for the further application of the research results.
{"title":"Calculating Simulation Model Parameters for Electromechanical System of Rolling Mill Stand","authors":"A. Karandaev, S. Baskov, O. Gasiyarova, B. Loginov, V. Khramshin","doi":"10.1109/UralCon49858.2020.9216265","DOIUrl":"https://doi.org/10.1109/UralCon49858.2020.9216265","url":null,"abstract":"Improving the precision of calculating the model parameters of the rolling stand electromechanical system is a relevant problem. When developing models, such systems are assumed to be two-mass ones with an elastic constraint and angular gaps in the transmitting shaft line (spindle). Applying the technique for calculating the parameters of the “drive-roll” simulation model based on experimentally recorded oscillograms is exemplified by the electric drives of the reversing rolling stand at the plate mill 5000 of PJSC Magnitogorsk Iron and Steel Works. The spindle design has been considered; it is shown that gaps are most frequently formed at the coupling heads on the roll and the engine rotor sides. The drive model structure in a closed-loop speed control system is given. The approximation of the inner motor torque control loop transfer function by a second-order filter is justified. The frequency characteristics of the loop response for the disturbing effect have been studied. The oscillatory nature of the transient torque at the initial control adjustment has been proved. Processes have been simulated for shock loading and different speed control time constants. The optimal time constant variation range ensuring the reduction of oscillations in a closed-loop system is justified. The design transient torque curves are provided for the acceleration and shock loading modes at various angular gaps in the spindle joints. It is shown that at the optimal speed control setting, the angular gap affects the amplitude insignificantly. Recommendations are given for the further application of the research results.","PeriodicalId":230353,"journal":{"name":"2020 International Ural Conference on Electrical Power Engineering (UralCon)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115740178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-01DOI: 10.1109/uralcon49858.2020.9216298
{"title":"[Copyright notice]","authors":"","doi":"10.1109/uralcon49858.2020.9216298","DOIUrl":"https://doi.org/10.1109/uralcon49858.2020.9216298","url":null,"abstract":"","PeriodicalId":230353,"journal":{"name":"2020 International Ural Conference on Electrical Power Engineering (UralCon)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130615586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-01DOI: 10.1109/UralCon49858.2020.9216242
Yury P. Filushov, Gennady M. Simakov, M. A. Pavlova
the relevance of the work is due to the desire to effectively control a synchronous machine with different magnetic conductivity along the d and q axes. The well-known solution for controlling the current along the transverse axis is characterized by a significant increase in reactive power with an increase in load and speed, which determines the increase in losses in steel, limits the maximum speed and does not provide a minimum of heat losses in the electric drive. The engine operation modes considered allow increasing the electromagnetic moment and rotation speed, ensuring the efficient use of the electric machine and the power supply of the electric drive under conditions of current and voltage limitation. The limiting characteristics of a synchronous machine by excitation from permanent magnets while limiting voltage and current are considered. The dependence of the position of the current vector relative to the flux of permanent magnets on its module is determined, delivering a maximum of the electromagnetic moment in an explicit pole synchronous machine. The energy efficiency of the proposed control methods is compared with the control of current along the transverse axis. The considered control solutions can be used in an electric drive of transport, where in the conditions of limiting voltage and current it is important to transfer large power to the executive mechanism due to the efficient use of an electric machinealready defines the components of your paper
{"title":"Effective Work of a Synchron Machine with Different Magnetic Conductivity on Permanent Magnets Excitation","authors":"Yury P. Filushov, Gennady M. Simakov, M. A. Pavlova","doi":"10.1109/UralCon49858.2020.9216242","DOIUrl":"https://doi.org/10.1109/UralCon49858.2020.9216242","url":null,"abstract":"the relevance of the work is due to the desire to effectively control a synchronous machine with different magnetic conductivity along the d and q axes. The well-known solution for controlling the current along the transverse axis is characterized by a significant increase in reactive power with an increase in load and speed, which determines the increase in losses in steel, limits the maximum speed and does not provide a minimum of heat losses in the electric drive. The engine operation modes considered allow increasing the electromagnetic moment and rotation speed, ensuring the efficient use of the electric machine and the power supply of the electric drive under conditions of current and voltage limitation. The limiting characteristics of a synchronous machine by excitation from permanent magnets while limiting voltage and current are considered. The dependence of the position of the current vector relative to the flux of permanent magnets on its module is determined, delivering a maximum of the electromagnetic moment in an explicit pole synchronous machine. The energy efficiency of the proposed control methods is compared with the control of current along the transverse axis. The considered control solutions can be used in an electric drive of transport, where in the conditions of limiting voltage and current it is important to transfer large power to the executive mechanism due to the efficient use of an electric machinealready defines the components of your paper","PeriodicalId":230353,"journal":{"name":"2020 International Ural Conference on Electrical Power Engineering (UralCon)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121441085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-01DOI: 10.1109/UralCon49858.2020.9216262
A. Vozmilov, A. Evdokimov, V. Charykov
The electromagnetic separator for removing magnetic particles from liquid materials is considered in the paper. The model of semiconductor converter for electromagnetic separator is developed in MATLAB Simulink. The converter load parameters (active resistance and inductance of magnetizing coils) are defined. Inductance of the coils is calculated in the Elcut application. The main parameters of the power source and its elements are defined via the rectifier simulation. Using the obtained results the experimental laboratory prototype of the electromagnetic separator is developed and assembled. To evaluate the efficiency of the developed separator, its magnetic system was calculated by the finite element method. The maximum magnetic induction in the concentrator, according to calculations, occurs above the pole piece with a magnetizing coil, the minimum is between the two cores of the electromagnet.
{"title":"Simulation of Semiconductor Converter for Electromagnetic Separator","authors":"A. Vozmilov, A. Evdokimov, V. Charykov","doi":"10.1109/UralCon49858.2020.9216262","DOIUrl":"https://doi.org/10.1109/UralCon49858.2020.9216262","url":null,"abstract":"The electromagnetic separator for removing magnetic particles from liquid materials is considered in the paper. The model of semiconductor converter for electromagnetic separator is developed in MATLAB Simulink. The converter load parameters (active resistance and inductance of magnetizing coils) are defined. Inductance of the coils is calculated in the Elcut application. The main parameters of the power source and its elements are defined via the rectifier simulation. Using the obtained results the experimental laboratory prototype of the electromagnetic separator is developed and assembled. To evaluate the efficiency of the developed separator, its magnetic system was calculated by the finite element method. The maximum magnetic induction in the concentrator, according to calculations, occurs above the pole piece with a magnetizing coil, the minimum is between the two cores of the electromagnet.","PeriodicalId":230353,"journal":{"name":"2020 International Ural Conference on Electrical Power Engineering (UralCon)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115145981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-01DOI: 10.1109/UralCon49858.2020.9216254
R. Klyuev, R. Turluev, A. Khadzhiev
The article presents the results of a study of electrical parameters and indicators of pumping unit's power quality installed in the electrolyte shop at an industrial enterprise of non-ferrous metallurgy. In the course of a comprehensive energy audit, non-sinusoidality's coefficients of the higher harmonic components in terms of current and voltage for pumps were determined. Non-sinusoidality'presence is due to the presence of nonlinear power receivers at the enterprise - gate converters and induction furnaces involved in the technological process of the electrolyte shop. Along with this, a set of measures has been developed to optimize the operation of pumping units, taking into account economic efficiency. Measures include replacing outdated low-performance pumps with high-efficiency pumps, improving pump loading, regulating pump operation, reducing pipeline resistance, eliminating leaks, and reducing power consumption by improving cooling systems.
{"title":"Analysis of Power Quality and Pumping Units Operation's Optimization","authors":"R. Klyuev, R. Turluev, A. Khadzhiev","doi":"10.1109/UralCon49858.2020.9216254","DOIUrl":"https://doi.org/10.1109/UralCon49858.2020.9216254","url":null,"abstract":"The article presents the results of a study of electrical parameters and indicators of pumping unit's power quality installed in the electrolyte shop at an industrial enterprise of non-ferrous metallurgy. In the course of a comprehensive energy audit, non-sinusoidality's coefficients of the higher harmonic components in terms of current and voltage for pumps were determined. Non-sinusoidality'presence is due to the presence of nonlinear power receivers at the enterprise - gate converters and induction furnaces involved in the technological process of the electrolyte shop. Along with this, a set of measures has been developed to optimize the operation of pumping units, taking into account economic efficiency. Measures include replacing outdated low-performance pumps with high-efficiency pumps, improving pump loading, regulating pump operation, reducing pipeline resistance, eliminating leaks, and reducing power consumption by improving cooling systems.","PeriodicalId":230353,"journal":{"name":"2020 International Ural Conference on Electrical Power Engineering (UralCon)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114353760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-01DOI: 10.1109/UralCon49858.2020.9216299
A. Kulikov, A. Loskutov, P. Pelevin
The article proposes a new method for autoreclosing of combined overhead and cable power lines (OCPL) based on traveling wave methods, which allows to increase the reliability of their protection. Determination of the faulted section is based on the estimation of the level of transient signals. This indicates the simplicity of the method and reduced requirements for the corresponding digital processing algorithms. It is shown that the fault-induced transient during propagation to the line terminals attenuate in a different way depending on the faulted section of the OCPL. The ratio of the signal values at the two ends of the OCPL allows to determine the faulted section with high selectivity. To estimate the method, faults on the OCPL were simulated in PSCAD. The distortions introduced by the line discontinuity, substation equipment and secondary circuits of the measuring transformers were taken into account. The simulation results showed that the faulted section is determined correctly in most cases of faults on the OCPL The exception is short circuits in the overhead section within a small zone near the overhead-cable transition. In these overhead areas, which is several tens or hundreds of meters, the autoreclosing must be blocked.
{"title":"The Method of Faulted Section Estimation for Combined Overhead and Cable Power Lines Using Double-Ended Measurements","authors":"A. Kulikov, A. Loskutov, P. Pelevin","doi":"10.1109/UralCon49858.2020.9216299","DOIUrl":"https://doi.org/10.1109/UralCon49858.2020.9216299","url":null,"abstract":"The article proposes a new method for autoreclosing of combined overhead and cable power lines (OCPL) based on traveling wave methods, which allows to increase the reliability of their protection. Determination of the faulted section is based on the estimation of the level of transient signals. This indicates the simplicity of the method and reduced requirements for the corresponding digital processing algorithms. It is shown that the fault-induced transient during propagation to the line terminals attenuate in a different way depending on the faulted section of the OCPL. The ratio of the signal values at the two ends of the OCPL allows to determine the faulted section with high selectivity. To estimate the method, faults on the OCPL were simulated in PSCAD. The distortions introduced by the line discontinuity, substation equipment and secondary circuits of the measuring transformers were taken into account. The simulation results showed that the faulted section is determined correctly in most cases of faults on the OCPL The exception is short circuits in the overhead section within a small zone near the overhead-cable transition. In these overhead areas, which is several tens or hundreds of meters, the autoreclosing must be blocked.","PeriodicalId":230353,"journal":{"name":"2020 International Ural Conference on Electrical Power Engineering (UralCon)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126527432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-01DOI: 10.1109/UralCon49858.2020.9216250
A. Zhurkin, Yu. Matyunina, M. Rashevskaya
The problem of calculating active electric energy losses under the conditions of a non-sinusoidal voltage in the 380 V network is considered. The network voltage is represented as a partially steady signal, with the time dependences of signal component frequencies or harmonic components being piecewise constant functions. This circumstance adds difficulty to the use of classic loss calculation methods, which do not allow the spectrum to be analyzed as a function of time. For solving the problem, the discrete-time short-time Fourier transform is applied. Based on the results of calculating the discrete-time short-time Fourier transform, the steadiness intervals are determined, in which the electric energy losses are subsequently calculated using the well-known formulas. For estimating the validity of the proposed approach, simulation is carried out of the electric network part containing an industrial load connected to a 380 V bus via a cable line in which the electric energy losses are calculated. A conclusion about the applicability of the short-time Fourier transform is drawn.
{"title":"Application of the Short Time Fourier Transform for Calculating Electric Energy Losses under the Conditions of a Non-Sinusoidal Voltage","authors":"A. Zhurkin, Yu. Matyunina, M. Rashevskaya","doi":"10.1109/UralCon49858.2020.9216250","DOIUrl":"https://doi.org/10.1109/UralCon49858.2020.9216250","url":null,"abstract":"The problem of calculating active electric energy losses under the conditions of a non-sinusoidal voltage in the 380 V network is considered. The network voltage is represented as a partially steady signal, with the time dependences of signal component frequencies or harmonic components being piecewise constant functions. This circumstance adds difficulty to the use of classic loss calculation methods, which do not allow the spectrum to be analyzed as a function of time. For solving the problem, the discrete-time short-time Fourier transform is applied. Based on the results of calculating the discrete-time short-time Fourier transform, the steadiness intervals are determined, in which the electric energy losses are subsequently calculated using the well-known formulas. For estimating the validity of the proposed approach, simulation is carried out of the electric network part containing an industrial load connected to a 380 V bus via a cable line in which the electric energy losses are calculated. A conclusion about the applicability of the short-time Fourier transform is drawn.","PeriodicalId":230353,"journal":{"name":"2020 International Ural Conference on Electrical Power Engineering (UralCon)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132036589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-01DOI: 10.1109/UralCon49858.2020.9216271
Valery G. Goldshteyn, A. S. Vedernikov, Nikolay V. Tanaev
A mathematical model of shortcircuit and break (SCB) modes and their combinations in electric networks (EN) with multi-circuit overhead lines (MCOL), the circuits of which have different rated voltages, is proposed. Considering their specifics, the method of calculating the SCB modes in phase coordinates based on superimposing the Actual Emergency Modes with Pre-Emergency Modes (AEM and PEM) is formulated. The article gives a procedure for considering the boundary conditions of fault different types and their combinations in determining the parameters of their modes using additional sources. The technique is focused on multivariate calculations of the totality of faults in ENs with MCOL, i.e. when moving the fault point along their branches and nodes and combinations of these faults with breaks and disconnections of three-phase branches and individual phases.
{"title":"Mathematical Models of Short-Circuit and Break Modes in Electric Networks with Multi-Circuitoverhead Lines","authors":"Valery G. Goldshteyn, A. S. Vedernikov, Nikolay V. Tanaev","doi":"10.1109/UralCon49858.2020.9216271","DOIUrl":"https://doi.org/10.1109/UralCon49858.2020.9216271","url":null,"abstract":"A mathematical model of shortcircuit and break (SCB) modes and their combinations in electric networks (EN) with multi-circuit overhead lines (MCOL), the circuits of which have different rated voltages, is proposed. Considering their specifics, the method of calculating the SCB modes in phase coordinates based on superimposing the Actual Emergency Modes with Pre-Emergency Modes (AEM and PEM) is formulated. The article gives a procedure for considering the boundary conditions of fault different types and their combinations in determining the parameters of their modes using additional sources. The technique is focused on multivariate calculations of the totality of faults in ENs with MCOL, i.e. when moving the fault point along their branches and nodes and combinations of these faults with breaks and disconnections of three-phase branches and individual phases.","PeriodicalId":230353,"journal":{"name":"2020 International Ural Conference on Electrical Power Engineering (UralCon)","volume":"188 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115719209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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