Alexei Babizki - Academia.edu (original) (raw)
Papers by Alexei Babizki
An apparatus and a method for power control process performed an electric arc furnace (10) are di... more An apparatus and a method for power control process performed an electric arc furnace (10) are disclosed. With a plurality of sensor types (15, 16, 17) current operating parameters of the electric arc furnace (10) are detected as a function of time. A control and regulating unit (30) determines the necessity of the measured values whether a semiconductor switch (20) different winding taps (T
The invention relates to a device (1) and a method for controlling the stability of a local netwo... more The invention relates to a device (1) and a method for controlling the stability of a local network (3). The local network (3) having a plurality of outlets (4 be made with a load switch (14) for setting an output voltage of the local network transformer (10). Means (16) for current measurement, with at least one of the plurality of outlets (4
The implementation of decision support for asset replacement and the maintenance of transformer f... more The implementation of decision support for asset replacement and the maintenance of transformer fleet management is based on a technical risk score (Health Index) and criticality. This paper describes the application of measurements obtained from online monitoring and regular diagnostic methods for identification of suspect transformers based on the Health Index (HI). The computer software system supports risk-based maintenance and replacement prioritization compliant with PAS 55(Publicly Available Specification for the optimal management of physical assets) and DIN VDE 0109. Initial field test results demonstrate the feasibility of this approach, and its application for asset managers to prioritize replacement decisions and improve maintenance programs. Data integration based on IEC 61970 (CIM) enables the number of APIs (application programming interface) between the software systems of different vendors to be reduced to a minimum. The parameters obtained from online and diagnosti...
Reference apparatus for ophthalmological measurement, with at least one imitation (10) of a corne... more Reference apparatus for ophthalmological measurement, with at least one imitation (10) of a cornea, and / or a simulation (12) of an eye lens with light scattering means (10a, 12a) such that the recorded at a slit illumination and a recording with a camera (24) forming a corneal shape and / or lens mold and / or iris shape at least partially reflecting, characterized in that at least one of said replicas (10, 12) having a surface made of silicone with scattering properties and having inside no scattering centers.
Keypad having a plurality of pressure-sensitive key regions (10), wherein each key region (10) a ... more Keypad having a plurality of pressure-sensitive key regions (10), wherein each key region (10) a light-guiding structure (12) and each light-conducting structure (12) a light source (24) for introducing light into the light-conductive structure (12) and an optical receiver (26 ) is assigned for receiving light from the light conducting structure (12), wherein the light-conducting structures (12) by a common cover (6) with high inherent rigidity the interposition of a resilient pad (14) are covered and the light-guiding structures (12) a common support plate (8) are mounted, such that when a pressure on a key region (10) of the cover (6) against the support (14) and this against the light-conducting structure (12) is pressed, so that in the light conducting structure (12) is disturbed, and light propagating this error is evaluated as a duty signal, characterized in that a means (16) for Toleranzausgle I is provided by differences in height of the mounting positions of the light-guidi...
It is an apparatus and method for reducing harmonic distortion in the operation of an electric ar... more It is an apparatus and method for reducing harmonic distortion in the operation of an electric arc furnace (10) is disclosed. The arc furnace (10) has three strands (7) each having an electrode (4). In each strand a sensor (15) for measuring the actually flowing current, and a sensor (16) for the measurement of the currently applied voltage are provided. A control unit (30) calculates an electrical actual value (E A semiconductor switch (20) is assigned to the furnace transformer (6) that by appropriate selection of three target winding tap (T
Vorrichtung zur Regelung eines Lichtbogenofens (10) in der Anfangsphase eines Schmelzprozesses, u... more Vorrichtung zur Regelung eines Lichtbogenofens (10) in der Anfangsphase eines Schmelzprozesses, umfassend – drei Strange (7) mit jeweils einer Elektrode (4) und einer zugeordneten Ausenleitung (5) zur elektrischen Energiezufuhrung, wobei in jedem Strang (7) ein Sensor (16) zur Messung der aktuellen Spannung und ein Sensor (15) zur Messung des aktuell fliesenden Stroms vorgesehen ist; – eine Steuer- und Regeleinheit (30), mit der fur jeden Strang (7) zeitabhangig eine elektrische Ist-Grose (Eist) berechenbar ist; – mindestens einen Ofentransformator (6) mit einer Primarseite (6P) und einer Sekundarseite (6S); – mindestens einen Laststufenschalter (20), der Wicklungsanzapfungen (TS1, ..., TSN) der Primarseite (6P) schaltet, wobei die drei Elektroden (4) mit der Sekundarseite (6S) elektrisch verbunden sind, dadurch gekennzeichnet, dass – der Laststufenschalter ein Halbleiterstufenschalter (20) ist, der eine Taktzeit von einigen Millisekunden realisiert.
Verfahren zum Steuern eines Regeltransformators (13) mit einstellbarem Ubersetzungsverhaltnis, de... more Verfahren zum Steuern eines Regeltransformators (13) mit einstellbarem Ubersetzungsverhaltnis, der zwischen ein erstes und zweites Wechselstromnetz (11, 12) geschaltet ist, wobei – die Zeigerdaten ermittelt werden; – fur das erste Wechselstromnetz ein Ersatzschaltbild mit Ersatzschaltbildparametern ermittelt wird; – fur das zweite Wechselstromnetz ein Lastmodell mit Lastmodellparametern ermittelt wird; – die Ersatzschaltbildparameter und die Lastmodellparameter aus den Zeigerdaten ermittelt werden; – wenn auf ein gewunschtes Ubersetzungsverhaltnis umgeschaltet werden soll, • fur das gewunschte Ubersetzungsverhaltnis ein Arbeitspunkt (A') des zweiten Wechselstromnetzes vorhergesagt wird; • fur den vorhergesagten Arbeitspunkt ein Stabilitatskriterium in dem zweiten Wechselstromnetz uberpruft wird; • falls das Stabilitatskriterium erfullt ist, auf das gewunschte Ubersetzungsverhaltnis umgeschaltet wird, sonst nicht.
Power transformers are the most expensive and perhaps the most strategic assets in a substation. ... more Power transformers are the most expensive and perhaps the most strategic assets in a substation. Accordingly, transformer operators both in the utilities and in industry are drawn to optimize their overall financial performance by maintaining a high reliability and extending lifetime at minimal costs. One obvious requirement for this performance improvement is knowledge about the current condition of the whole transformer fleet. This information is essential for the short-term, long-term, and strategic decisions of the transformer operator. In most companies, different funding sources (and departments) are responsible for the optimal fleet management: capital expenditures (CAPEX), operating expenditures (OPEX) and the grid operator.
This paper presents an approach about transformer fleet management implementing decision support ... more This paper presents an approach about transformer fleet management implementing decision support for maintenance and asset replacement based on technical risk score (Health Index) and criticality. The paper explains the method how to utilize the measurements from online monitoring and the well known diagnostic methods to identify the suspicious transformers based on the Health Index (HI). The computer software system supports the risk based maintenance and replacement prioritization complying with PAS 55(Publicly Available Specification for the optimal management of physical assets) and DIN VDE 0109. First results from the field tests demonstrate feasibility of the approach, and show how the asset manager may prioritize replacement decisions and improve maintenance programs. Data integration based on IEC 61970 (CIM) allows reducing to minimum the number of API's (application programming interface) between the software systems of different vendors. The measured parameters from online and diagnostic measurements are grouped into physical subgroups before the overall HI of transformers is calculated.
An apparatus and a method for power control process performed an electric arc furnace (10) are di... more An apparatus and a method for power control process performed an electric arc furnace (10) are disclosed. With a plurality of sensor types (15, 16, 17) current operating parameters of the electric arc furnace (10) are detected as a function of time. A control and regulating unit (30) determines the necessity of the measured values whether a semiconductor switch (20) different winding taps (T
The invention relates to a device (1) and a method for controlling the stability of a local netwo... more The invention relates to a device (1) and a method for controlling the stability of a local network (3). The local network (3) having a plurality of outlets (4 be made with a load switch (14) for setting an output voltage of the local network transformer (10). Means (16) for current measurement, with at least one of the plurality of outlets (4
The implementation of decision support for asset replacement and the maintenance of transformer f... more The implementation of decision support for asset replacement and the maintenance of transformer fleet management is based on a technical risk score (Health Index) and criticality. This paper describes the application of measurements obtained from online monitoring and regular diagnostic methods for identification of suspect transformers based on the Health Index (HI). The computer software system supports risk-based maintenance and replacement prioritization compliant with PAS 55(Publicly Available Specification for the optimal management of physical assets) and DIN VDE 0109. Initial field test results demonstrate the feasibility of this approach, and its application for asset managers to prioritize replacement decisions and improve maintenance programs. Data integration based on IEC 61970 (CIM) enables the number of APIs (application programming interface) between the software systems of different vendors to be reduced to a minimum. The parameters obtained from online and diagnosti...
Reference apparatus for ophthalmological measurement, with at least one imitation (10) of a corne... more Reference apparatus for ophthalmological measurement, with at least one imitation (10) of a cornea, and / or a simulation (12) of an eye lens with light scattering means (10a, 12a) such that the recorded at a slit illumination and a recording with a camera (24) forming a corneal shape and / or lens mold and / or iris shape at least partially reflecting, characterized in that at least one of said replicas (10, 12) having a surface made of silicone with scattering properties and having inside no scattering centers.
Keypad having a plurality of pressure-sensitive key regions (10), wherein each key region (10) a ... more Keypad having a plurality of pressure-sensitive key regions (10), wherein each key region (10) a light-guiding structure (12) and each light-conducting structure (12) a light source (24) for introducing light into the light-conductive structure (12) and an optical receiver (26 ) is assigned for receiving light from the light conducting structure (12), wherein the light-conducting structures (12) by a common cover (6) with high inherent rigidity the interposition of a resilient pad (14) are covered and the light-guiding structures (12) a common support plate (8) are mounted, such that when a pressure on a key region (10) of the cover (6) against the support (14) and this against the light-conducting structure (12) is pressed, so that in the light conducting structure (12) is disturbed, and light propagating this error is evaluated as a duty signal, characterized in that a means (16) for Toleranzausgle I is provided by differences in height of the mounting positions of the light-guidi...
It is an apparatus and method for reducing harmonic distortion in the operation of an electric ar... more It is an apparatus and method for reducing harmonic distortion in the operation of an electric arc furnace (10) is disclosed. The arc furnace (10) has three strands (7) each having an electrode (4). In each strand a sensor (15) for measuring the actually flowing current, and a sensor (16) for the measurement of the currently applied voltage are provided. A control unit (30) calculates an electrical actual value (E A semiconductor switch (20) is assigned to the furnace transformer (6) that by appropriate selection of three target winding tap (T
Vorrichtung zur Regelung eines Lichtbogenofens (10) in der Anfangsphase eines Schmelzprozesses, u... more Vorrichtung zur Regelung eines Lichtbogenofens (10) in der Anfangsphase eines Schmelzprozesses, umfassend – drei Strange (7) mit jeweils einer Elektrode (4) und einer zugeordneten Ausenleitung (5) zur elektrischen Energiezufuhrung, wobei in jedem Strang (7) ein Sensor (16) zur Messung der aktuellen Spannung und ein Sensor (15) zur Messung des aktuell fliesenden Stroms vorgesehen ist; – eine Steuer- und Regeleinheit (30), mit der fur jeden Strang (7) zeitabhangig eine elektrische Ist-Grose (Eist) berechenbar ist; – mindestens einen Ofentransformator (6) mit einer Primarseite (6P) und einer Sekundarseite (6S); – mindestens einen Laststufenschalter (20), der Wicklungsanzapfungen (TS1, ..., TSN) der Primarseite (6P) schaltet, wobei die drei Elektroden (4) mit der Sekundarseite (6S) elektrisch verbunden sind, dadurch gekennzeichnet, dass – der Laststufenschalter ein Halbleiterstufenschalter (20) ist, der eine Taktzeit von einigen Millisekunden realisiert.
Verfahren zum Steuern eines Regeltransformators (13) mit einstellbarem Ubersetzungsverhaltnis, de... more Verfahren zum Steuern eines Regeltransformators (13) mit einstellbarem Ubersetzungsverhaltnis, der zwischen ein erstes und zweites Wechselstromnetz (11, 12) geschaltet ist, wobei – die Zeigerdaten ermittelt werden; – fur das erste Wechselstromnetz ein Ersatzschaltbild mit Ersatzschaltbildparametern ermittelt wird; – fur das zweite Wechselstromnetz ein Lastmodell mit Lastmodellparametern ermittelt wird; – die Ersatzschaltbildparameter und die Lastmodellparameter aus den Zeigerdaten ermittelt werden; – wenn auf ein gewunschtes Ubersetzungsverhaltnis umgeschaltet werden soll, • fur das gewunschte Ubersetzungsverhaltnis ein Arbeitspunkt (A') des zweiten Wechselstromnetzes vorhergesagt wird; • fur den vorhergesagten Arbeitspunkt ein Stabilitatskriterium in dem zweiten Wechselstromnetz uberpruft wird; • falls das Stabilitatskriterium erfullt ist, auf das gewunschte Ubersetzungsverhaltnis umgeschaltet wird, sonst nicht.
Power transformers are the most expensive and perhaps the most strategic assets in a substation. ... more Power transformers are the most expensive and perhaps the most strategic assets in a substation. Accordingly, transformer operators both in the utilities and in industry are drawn to optimize their overall financial performance by maintaining a high reliability and extending lifetime at minimal costs. One obvious requirement for this performance improvement is knowledge about the current condition of the whole transformer fleet. This information is essential for the short-term, long-term, and strategic decisions of the transformer operator. In most companies, different funding sources (and departments) are responsible for the optimal fleet management: capital expenditures (CAPEX), operating expenditures (OPEX) and the grid operator.
This paper presents an approach about transformer fleet management implementing decision support ... more This paper presents an approach about transformer fleet management implementing decision support for maintenance and asset replacement based on technical risk score (Health Index) and criticality. The paper explains the method how to utilize the measurements from online monitoring and the well known diagnostic methods to identify the suspicious transformers based on the Health Index (HI). The computer software system supports the risk based maintenance and replacement prioritization complying with PAS 55(Publicly Available Specification for the optimal management of physical assets) and DIN VDE 0109. First results from the field tests demonstrate feasibility of the approach, and show how the asset manager may prioritize replacement decisions and improve maintenance programs. Data integration based on IEC 61970 (CIM) allows reducing to minimum the number of API's (application programming interface) between the software systems of different vendors. The measured parameters from online and diagnostic measurements are grouped into physical subgroups before the overall HI of transformers is calculated.