A novel thyristor-based power circuit is described which substitutes zero-voltage fired, time proportioning control, and thus allows fewer transformer taps while causing no degradation of circuit power factor. In addition, harmonic distortion usually associated with phase angle control in this application is also eliminated. A system description outlining power requirements, a comparison of power factor costs, and system design philosophy is provided, along with some operational history and an explanation of the thyristor control.<>
{"title":"Zero voltage fired, transformer coupled thyristor power control applied for temperature control of the tin bath in the float glass process","authors":"L. Heath, R. C. Blackmond","doi":"10.1109/IAS.1989.96823","DOIUrl":"https://doi.org/10.1109/IAS.1989.96823","url":null,"abstract":"A novel thyristor-based power circuit is described which substitutes zero-voltage fired, time proportioning control, and thus allows fewer transformer taps while causing no degradation of circuit power factor. In addition, harmonic distortion usually associated with phase angle control in this application is also eliminated. A system description outlining power requirements, a comparison of power factor costs, and system design philosophy is provided, along with some operational history and an explanation of the thyristor control.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"162 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131999254","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 : 1989-06-19DOI: 10.1109/PAPCON.1989.36934
J. Robertson, G. Heberlein
Reports have indicated, in some cases, that smoke detectors had not been triggered, even though smoke was evident. Smoke from electrical equipment was billowing out from under the doors of the switchgear rooms and still no alarm was given. Discussions were held to determine why the pendant-mounted smoke detectors had not been triggered, and how improved monitoring could be attained. The authors describe the research and testing of the use of smoke detectors installed directly inside low-voltage motor control centers. They address the reasons why the use of externally mounted (such as ceiling, pendant, or low-evaluation) smoke detectors, are not adequate in detecting smoldering or burning electrical insulation.<>
{"title":"Remote fault/smoke detection for motor control centers","authors":"J. Robertson, G. Heberlein","doi":"10.1109/PAPCON.1989.36934","DOIUrl":"https://doi.org/10.1109/PAPCON.1989.36934","url":null,"abstract":"Reports have indicated, in some cases, that smoke detectors had not been triggered, even though smoke was evident. Smoke from electrical equipment was billowing out from under the doors of the switchgear rooms and still no alarm was given. Discussions were held to determine why the pendant-mounted smoke detectors had not been triggered, and how improved monitoring could be attained. The authors describe the research and testing of the use of smoke detectors installed directly inside low-voltage motor control centers. They address the reasons why the use of externally mounted (such as ceiling, pendant, or low-evaluation) smoke detectors, are not adequate in detecting smoldering or burning electrical insulation.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134078546","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}
The authors show how built-in dependent sources in a circuit analysis program (PSPICE) can be used to model voltage and current source inverter circuits under large-signal operating conditions, including simple feedback. The simplified models proposed reduce the run time and the amount of memory required, allowing the simulation of topologies with increased circuit complexity and long computation intervals. It is shown how user-defined programs can be incorporated to obtain steady-state conditions, schematic capture capability, and input/output data manipulation, while operating under SPICE in a user-friendly environment suited for personal computers.<>
{"title":"Simple models for SPICE assist power electronics circuit simulation on PCs","authors":"L. Salazar, P. Ziogas, D. Vincenti","doi":"10.1109/IAS.1988.25192","DOIUrl":"https://doi.org/10.1109/IAS.1988.25192","url":null,"abstract":"The authors show how built-in dependent sources in a circuit analysis program (PSPICE) can be used to model voltage and current source inverter circuits under large-signal operating conditions, including simple feedback. The simplified models proposed reduce the run time and the amount of memory required, allowing the simulation of topologies with increased circuit complexity and long computation intervals. It is shown how user-defined programs can be incorporated to obtain steady-state conditions, schematic capture capability, and input/output data manipulation, while operating under SPICE in a user-friendly environment suited for personal computers.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116657481","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}
A more rigorous approach was used to evaluate the performance of the cold pipe precharger for electrostatic precipitator applications. A menu-driven numerical simulation was developed that allows various precharger operating conditions and wire-pipe configurations to be input, so the charging zone in the interelectrode space is determined. The next step is to solve the flow field, which allows simulation of the charging time for a given charging zone. The Navier-Stokes equations, coupled with the body force (the product of electric field and space charge density), are solved to determine the electrohydrodynamic (EHD) field. This information enables the particle charge to be determined under given operating conditions. The computed size-dependent particle charge showed good agreement with the experimental data, and the model is capable of providing good evaluations of the precharger.<>
{"title":"Evaluation of the cold pipe precharger","authors":"T. Yamamoto, P. Lawless, N. Plaks","doi":"10.1109/28.55987","DOIUrl":"https://doi.org/10.1109/28.55987","url":null,"abstract":"A more rigorous approach was used to evaluate the performance of the cold pipe precharger for electrostatic precipitator applications. A menu-driven numerical simulation was developed that allows various precharger operating conditions and wire-pipe configurations to be input, so the charging zone in the interelectrode space is determined. The next step is to solve the flow field, which allows simulation of the charging time for a given charging zone. The Navier-Stokes equations, coupled with the body force (the product of electric field and space charge density), are solved to determine the electrohydrodynamic (EHD) field. This information enables the particle charge to be determined under given operating conditions. The computed size-dependent particle charge showed good agreement with the experimental data, and the model is capable of providing good evaluations of the precharger.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125268804","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}
Single-phase offline switch-mode rectifiers (or, offline DC-DC converters) face severe component stresses in applications above 10 kW. This study shows that in three-phase switch-mode rectifier (SMR) topologies, component stresses are reduced and performances improved substantially. These improvements include faster response times, reduced switching stresses of the power semiconductor devices, and reduced size and rating of associated reactive components. The authors also present an analysis and design approach for three-phase SMR converters under large input-voltage and load variations. Output voltage control is achieved by varying the duty cycle of the inverter power semiconductor switches. The theoretical results are verified experimentally.<>
{"title":"Analysis and design of a three-phase offline DC-DC converter with high frequency isolation","authors":"A. Prasad, P. Ziogas, S. Manias","doi":"10.1109/28.148448","DOIUrl":"https://doi.org/10.1109/28.148448","url":null,"abstract":"Single-phase offline switch-mode rectifiers (or, offline DC-DC converters) face severe component stresses in applications above 10 kW. This study shows that in three-phase switch-mode rectifier (SMR) topologies, component stresses are reduced and performances improved substantially. These improvements include faster response times, reduced switching stresses of the power semiconductor devices, and reduced size and rating of associated reactive components. The authors also present an analysis and design approach for three-phase SMR converters under large input-voltage and load variations. Output voltage control is achieved by varying the duty cycle of the inverter power semiconductor switches. The theoretical results are verified experimentally.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126659651","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}
The sensitivity of the pole-arc/pole-pitch ratio of the stator and rotor on the performance of a switched reluctance motor is investigated. An analytical method based on magnetic flux path and a two-dimensional finite-element analysis are used. The sensitivity study is performed by comparing the average torque developed for different stator as well as rotor pole-arc/pole-pitch ratios and choosing the ratio combination that produces the greatest value of average torque.<>
{"title":"Sensitivity of pole arc/pole pitch ratio on switched reluctance motor performance","authors":"R. Arumugam, J. Lindsay, R. Krishnan","doi":"10.1109/IAS.1988.25041","DOIUrl":"https://doi.org/10.1109/IAS.1988.25041","url":null,"abstract":"The sensitivity of the pole-arc/pole-pitch ratio of the stator and rotor on the performance of a switched reluctance motor is investigated. An analytical method based on magnetic flux path and a two-dimensional finite-element analysis are used. The sensitivity study is performed by comparing the average torque developed for different stator as well as rotor pole-arc/pole-pitch ratios and choosing the ratio combination that produces the greatest value of average torque.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"176 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116398485","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}
The calculation of the inductance of tack/trolley haulage systems with parallel rail and earth-current-return paths is difficult because of the frequency dependence of the earth-return inductance and resistance. A simple iterative technique is discussed which allows the system time constant and inductance to be calculated easily. The method is tested against a large amount of measured data and compared with a simplified method for time constant calculation. The method is shown to give results which are quite accurate when the model used takes into account the nonideal mine DC network conditions. An additional comparison is made between measured results and an EMTP (electromagnetic transient pulse) simulation of an underground mine track/trolley short circuit transient. The technique is simple enough to have a short execution time on a personal computer.<>
{"title":"Inductance calculations for earth-return trolley systems","authors":"D. Tylavsky, A.Y. Kulkarmi","doi":"10.1109/IAS.1988.25215","DOIUrl":"https://doi.org/10.1109/IAS.1988.25215","url":null,"abstract":"The calculation of the inductance of tack/trolley haulage systems with parallel rail and earth-current-return paths is difficult because of the frequency dependence of the earth-return inductance and resistance. A simple iterative technique is discussed which allows the system time constant and inductance to be calculated easily. The method is tested against a large amount of measured data and compared with a simplified method for time constant calculation. The method is shown to give results which are quite accurate when the model used takes into account the nonideal mine DC network conditions. An additional comparison is made between measured results and an EMTP (electromagnetic transient pulse) simulation of an underground mine track/trolley short circuit transient. The technique is simple enough to have a short execution time on a personal computer.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"134 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122718141","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}
A PWM (pulsewidth-modulated) inverter with DC busbar voltage modulation of the capacitor discharge is presented and analyzed. DC busbar voltage is periodically modulated to zero, which can arise the switching frequency of the power switches by about one order of magnitude. The inverter is well suited for fully controlled power switches. A PWM-controlled scheme for a variable-frequency three-phase induction-motor drive especially suitable for this inverter circuit is discussed. The scheme adopts linear adaptive delta modulation to produce the PWM sequence. With delta modulation it is easy to change from a PWM pulse sequence to a square sequence smoothly. Microcomputer software can be used to produce the PWM sequence in real time.<>
{"title":"A PWM inverter with DC busbar voltage modulation of capacitor discharge","authors":"Wong Dafeng","doi":"10.1109/IAS.1988.25150","DOIUrl":"https://doi.org/10.1109/IAS.1988.25150","url":null,"abstract":"A PWM (pulsewidth-modulated) inverter with DC busbar voltage modulation of the capacitor discharge is presented and analyzed. DC busbar voltage is periodically modulated to zero, which can arise the switching frequency of the power switches by about one order of magnitude. The inverter is well suited for fully controlled power switches. A PWM-controlled scheme for a variable-frequency three-phase induction-motor drive especially suitable for this inverter circuit is discussed. The scheme adopts linear adaptive delta modulation to produce the PWM sequence. With delta modulation it is easy to change from a PWM pulse sequence to a square sequence smoothly. Microcomputer software can be used to produce the PWM sequence in real time.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116625391","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}
Since the switched reluctance motor (SRM) drive is in the research and development stage, a personal computer is an ideal choice for a controller, providing software reconfigurability, real-time control and reduced hardware complexity, among other advantages. The drive performance can be optimized based on the understanding gained with an interactive PC controller. The design and implementation details of such a controller are presented. Experimental results on a laboratory prototype SRM drive using a PC-based controller are included to corroborate the design approach.<>
{"title":"Design and performance of an interactive personal computer controller for switched reluctance motor drives","authors":"X. Mang, R. Krishnan, G. Chandramouli","doi":"10.1109/IAS.1988.25109","DOIUrl":"https://doi.org/10.1109/IAS.1988.25109","url":null,"abstract":"Since the switched reluctance motor (SRM) drive is in the research and development stage, a personal computer is an ideal choice for a controller, providing software reconfigurability, real-time control and reduced hardware complexity, among other advantages. The drive performance can be optimized based on the understanding gained with an interactive PC controller. The design and implementation details of such a controller are presented. Experimental results on a laboratory prototype SRM drive using a PC-based controller are included to corroborate the design approach.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117280769","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}
A description is given of the main developments, philosophy, and current state applications of computerized, underground mining machine vibration monitoring as seen from design effectiveness, cost-analysis, and evolutionary standpoints. The object is to provide for management a view of the use of computerized machinery vibration information to improve coal mine productivity by predictive maintenance. Data indicate that predictive preventive maintenance is a viable alternative to periodic preventive maintenance. It has produced considerable gains in machine up time as well as substantial savings in spare parts and in labor cost in other industries. Although vibration measurements are the basic tools for machine monitoring they should be used simultaneously with other techniques (oil analysis, infrared scan, motor meggering, efficiency test, etc.).<>
{"title":"Digital computer-based vibration monitoring in underground coal mine equipment","authors":"A. B. Ray","doi":"10.1109/IAS.1988.25220","DOIUrl":"https://doi.org/10.1109/IAS.1988.25220","url":null,"abstract":"A description is given of the main developments, philosophy, and current state applications of computerized, underground mining machine vibration monitoring as seen from design effectiveness, cost-analysis, and evolutionary standpoints. The object is to provide for management a view of the use of computerized machinery vibration information to improve coal mine productivity by predictive maintenance. Data indicate that predictive preventive maintenance is a viable alternative to periodic preventive maintenance. It has produced considerable gains in machine up time as well as substantial savings in spare parts and in labor cost in other industries. Although vibration measurements are the basic tools for machine monitoring they should be used simultaneously with other techniques (oil analysis, infrared scan, motor meggering, efficiency test, etc.).<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128295760","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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