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Marjan Popov - One of the best experts on this subject based on the ideXlab platform.
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probabilistic analysis of switching transients due to vacuum circuit breaker operation on wind turbine step up transformers
Electric Power Systems Research, 2020Co-Authors: Sajjad Ghasemi, Mehdi Allahbakhshi, Behzad Behdani, Mohsen Tajdinian, Marjan PopovAbstract:Vacuum circuit breaker operation causes transient Overvoltages that may lead to severe damages to transformer insulation. Since the parameters affecting these Overvoltages have stochastic nature, a statistical analysis may provide detailed insight into the Overvoltages from the point of view of insulation coordination applications. In this paper, a statistical analysis of the Overvoltage variations of the step-up transformer during vacuum circuit breaker operation is conducted. Some variables, including switching angle, current chopping, high-frequency current quenching capability, and wind turbine power, are assumed as random variables. Besides, some indicators representing the switching Overvoltage characteristics such as the amplitude, the number of restrikes, and the rate of rise are extracted. By performing a probabilistic analysis, the destructiveness due to switching Overvoltages on typical transformer insulation can be investigated. The sensitivity of different surge protective devices and their effectivities are also analyzed and statistically evaluated. The applied methodology is very useful because of the stochastic nature of the switching Overvoltages. In this work, the impact of protective equipment on each of the Overvoltage indicators is analyzed. It is also found that considering only the amplitudes of transient Overvoltages is not enough to draw conclusions about the safety of the transformer when exposed to frequent switching surges.
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statistical analysis of energization Overvoltages in ehv hybrid ohl cable systems
IEEE Transactions on Power Delivery, 2018Co-Authors: Hossein Khalilnezhad, Lou Van Der Sluis, Marjan Popov, Jorrit A Bos, Akihiro AmetaniAbstract:Energization Overvoltages are among the severest Overvoltages stressing insulations of EHV power system components. Since these Overvoltages have a statistical nature, the insulation level should be determined with the use of a statistical approach by which the distribution of Overvoltages is calculated. Literature has properly studied the distribution of energization Overvoltages in purely overhead line (OHL) or cable systems, but such a study is not available for hybrid systems consisting of both OHLs and cables. It is expected that the Overvoltage distributions change substantially when both OHLs and cables are used in a transmission line. This paper tackles this issue by analyzing the Overvoltage distributions due to the energization of a 380 kV hybrid OHL-cable circuit, in which the cable length is variable. The study includes various sensitivity analyses to find out the impact of system parameters and topology on Overvoltages. By the statistical analysis, it has been discovered that energization Overvoltages of a hybrid OHL–cable circuit are higher than those of a fully-cable circuit and very likely lower than those of a fully-OHL circuit with the same transmission lengths.
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Improved calculations for no-load transformer switching surges
2016Co-Authors: Marjan Popov, Lou Van Der Sluis, Senior MemberAbstract:Abstract—This paper deals with a modeling of components and calculation of transient Overvoltages that build up on the trans-former primary terminals after the transformer has been switched off by a vacuum circuit breaker (VCB). The transformer is con-nected to the circuit breaker by a cable. The transient Overvoltages are calculated for different cable lengths, and the cumulative prob-ability of different arc angles is investigated. In this study two cases are considered: transient Overvoltages due to steady-state magnetizing current switching, and transient Overvoltages due to inrush current switching. It is shown that the case of inrush current switching is worse, as virtual current chop-ping is possible. The cable is modeled by pi sections, whereas the transformer model is based on a terminal impedance. The VCB re-ignitions are modeled by means of withstand voltage character-istics and high-frequency quenching capability. Due to shortage of field tests, this work uses only literature references to compare the results with actual measurements. Index Terms—Modeling, Overvoltage, transformer, VCB. I
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Analysis of switching transient Overvoltages in the power system of floating production storage and offloading vessel
Electric Power Systems Research, 2014Co-Authors: Haoyan Xue, Marjan PopovAbstract:Abstract Large transient Overvoltages can be caused by the switching operation of vacuum circuit breakers (VCBs) during disconnection of induction motors. In this paper VCBs, cables, generators, busbars, induction motors and surge arresters are modeled by making use of ATP-EMTP. Switching transient Overvoltages of four typical induction motors under the starting, the full load and the light load working conditions in the power system of the selected floating production storage and offloading (FPSO) vessel are analyzed. A suitable protection against the switching transient Overvoltage is proposed and the results are presented accordingly.
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Analysis of Switching Transient Overvoltages in the Power System of Floating Production Storage and Offloading Vessel
2013Co-Authors: Haoyan Xue, Marjan PopovAbstract:Large transient Overvoltages are normally caused by vacuum circuit breaker (VCB) switching operation during disconnection of induction motors. In this paper VCBs, cables, generators, busbars, induction motors and surge arresters are modeled by making use of ATP-EMTP. Switching transient Overvoltages of four typical induction motors are analyzed under starting, full load and light load working conditions in a power system of a Floating Production Storage and Offloading (FPSO) vessel. A suitable protection against the switching transient Overvoltage is proposed and the results are presented.
Popov M. - One of the best experts on this subject based on the ideXlab platform.
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Probabilistic analysis of switching transients due to vacuum circuit breaker operation on wind turbine step-up transformers
'Elsevier BV', 2020Co-Authors: Ghasemi Sajjad, Allahbakhshi Mehdi, Behdani Behzad, Tajdinian Mohsen, Popov M.Abstract:Vacuum circuit breaker operation causes transient Overvoltages that may lead to severe damages to transformer insulation. Since the parameters affecting these Overvoltages have stochastic nature, a statistical analysis may provide detailed insight into the Overvoltages from the point of view of insulation coordination applications. In this paper, a statistical analysis of the Overvoltage variations of the step-up transformer during vacuum circuit breaker operation is conducted. Some variables, including switching angle, current chopping, high-frequency current quenching capability, and wind turbine power, are assumed as random variables. Besides, some indicators representing the switching Overvoltage characteristics such as the amplitude, the number of restrikes, and the rate of rise are extracted. By performing a probabilistic analysis, the destructiveness due to switching Overvoltages on typical transformer insulation can be investigated. The sensitivity of different surge protective devices and their effectivities are also analyzed and statistically evaluated. The applied methodology is very useful because of the stochastic nature of the switching Overvoltages. In this work, the impact of protective equipment on each of the Overvoltage indicators is analyzed. It is also found that considering only the amplitudes of transient Overvoltages is not enough to draw conclusions about the safety of the transformer when exposed to frequent switching surges.Intelligent Electrical Power Grid
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Probabilistic analysis of switching transients due to vacuum circuit breaker operation on wind turbine step-up transformers
'Elsevier BV', 2020Co-Authors: Ghasemi Sajjad, Allahbakhshi Mehdi, Behdani Behzad, Tajdinian Mohsen, Popov M.Abstract:Vacuum circuit breaker operation causes transient Overvoltages that may lead to severe damages to transformer insulation. Since the parameters affecting these Overvoltages have stochastic nature, a statistical analysis may provide detailed insight into the Overvoltages from the point of view of insulation coordination applications. In this paper, a statistical analysis of the Overvoltage variations of the step-up transformer during vacuum circuit breaker operation is conducted. Some variables, including switching angle, current chopping, high-frequency current quenching capability, and wind turbine power, are assumed as random variables. Besides, some indicators representing the switching Overvoltage characteristics such as the amplitude, the number of restrikes, and the rate of rise are extracted. By performing a probabilistic analysis, the destructiveness due to switching Overvoltages on typical transformer insulation can be investigated. The sensitivity of different surge protective devices and their effectivities are also analyzed and statistically evaluated. The applied methodology is very useful because of the stochastic nature of the switching Overvoltages. In this work, the impact of protective equipment on each of the Overvoltage indicators is analyzed. It is also found that considering only the amplitudes of transient Overvoltages is not enough to draw conclusions about the safety of the transformer when exposed to frequent switching surges.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Intelligent Electrical Power Grid
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Statistical Analysis of Energization Overvoltages in EHV Hybrid OHL-Cable Systems
2018Co-Authors: Khalilnezhad H., Popov M., Van Der Sluis L., Ametani A.Abstract:Energization Overvoltages are among the severest Overvoltages stressing insulations of EHV power system components. Since these Overvoltages have a statistical nature, the insulation level should be determined with the use of a statistical approach by which the distribution of Overvoltages is calculated. Literature has properly studied the distribution of energization Overvoltages in purely OHL or cable systems, but such a study is not available for hybrid systems consisting of both OHLs and cables. It is expected that the Overvoltage distributions change substantially when both OHLs and cables are used in a transmission line. This paper tackles this issue by analyzing the Overvoltage distributions due to the energization of a 380 kV hybrid OHL-Cable circuit, in which the cable length is variable. The study includes various sensitivity analyses to find out the impact of system parameters and topology on Overvoltages. By the statistical analysis, it has been discovered that energization Overvoltages of a hybrid OHL-Cable circuit are higher than those of a fully-cable circuit and very likely lower than those of a fully-OHL circuit with the same transmission lengths.
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Statistical Analysis of Energization Overvoltages in EHV Hybrid OHL-Cable Systems
'Institute of Electrical and Electronics Engineers (IEEE)', 2018Co-Authors: Khalilnezhad H., Popov M., Van Der Sluis L., Bos J.a., Ametani AkihiroAbstract:Energization Overvoltages are among the severest Overvoltages stressing insulations of EHV power system components. Since these Overvoltages have a statistical nature, the insulation level should be determined with the use of a statistical approach by which the distribution of Overvoltages is calculated. Literature has properly studied the distribution of energization Overvoltages in purely OHL or cable systems, but such a study is not available for hybrid systems consisting of both OHLs and cables. It is expected that the Overvoltage distributions change substantially when both OHLs and cables are used in a transmission line. This paper tackles this issue by analyzing the Overvoltage distributions due to the energization of a 380 kV hybrid OHL-Cable circuit, in which the cable length is variable. The study includes various sensitivity analyses to find out the impact of system parameters and topology on Overvoltages. By the statistical analysis, it has been discovered that energization Overvoltages of a hybrid OHL-Cable circuit are higher than those of a fully-cable circuit and very likely lower than those of a fully-OHL circuit with the same transmission lengths.Accepted Author ManuscriptIntelligent Electrical Power GridsEEMCS - Genera
Lou Van Der Sluis - One of the best experts on this subject based on the ideXlab platform.
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statistical analysis of energization Overvoltages in ehv hybrid ohl cable systems
IEEE Transactions on Power Delivery, 2018Co-Authors: Hossein Khalilnezhad, Lou Van Der Sluis, Marjan Popov, Jorrit A Bos, Akihiro AmetaniAbstract:Energization Overvoltages are among the severest Overvoltages stressing insulations of EHV power system components. Since these Overvoltages have a statistical nature, the insulation level should be determined with the use of a statistical approach by which the distribution of Overvoltages is calculated. Literature has properly studied the distribution of energization Overvoltages in purely overhead line (OHL) or cable systems, but such a study is not available for hybrid systems consisting of both OHLs and cables. It is expected that the Overvoltage distributions change substantially when both OHLs and cables are used in a transmission line. This paper tackles this issue by analyzing the Overvoltage distributions due to the energization of a 380 kV hybrid OHL-cable circuit, in which the cable length is variable. The study includes various sensitivity analyses to find out the impact of system parameters and topology on Overvoltages. By the statistical analysis, it has been discovered that energization Overvoltages of a hybrid OHL–cable circuit are higher than those of a fully-cable circuit and very likely lower than those of a fully-OHL circuit with the same transmission lengths.
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Improved calculations for no-load transformer switching surges
2016Co-Authors: Marjan Popov, Lou Van Der Sluis, Senior MemberAbstract:Abstract—This paper deals with a modeling of components and calculation of transient Overvoltages that build up on the trans-former primary terminals after the transformer has been switched off by a vacuum circuit breaker (VCB). The transformer is con-nected to the circuit breaker by a cable. The transient Overvoltages are calculated for different cable lengths, and the cumulative prob-ability of different arc angles is investigated. In this study two cases are considered: transient Overvoltages due to steady-state magnetizing current switching, and transient Overvoltages due to inrush current switching. It is shown that the case of inrush current switching is worse, as virtual current chop-ping is possible. The cable is modeled by pi sections, whereas the transformer model is based on a terminal impedance. The VCB re-ignitions are modeled by means of withstand voltage character-istics and high-frequency quenching capability. Due to shortage of field tests, this work uses only literature references to compare the results with actual measurements. Index Terms—Modeling, Overvoltage, transformer, VCB. I
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Statistical estimation of reignition Overvoltages and probability of reignition when switching transformers and motors with a vacuum circuit breaker
IEE Conference Publication, 2005Co-Authors: Marjan Popov, Lou Van Der SluisAbstract:This paper presents a method on how to calculate the cumulative occurrence of Overvoltages during switching off magnetising currents or inrush currents of an unloaded transformer. A vacuum circuit breaker (VCB) is considered to open statistically with a normal distribution. Based on this assumption, the maximum Overvoltage in a system that consists of a VCB, a cable and a transformer is simulated and the cumulative occurrence is calculated. The probability of reignition is quantified and as an example, the standard motor circuit according to IEC61233 is used. Computations are done by using a proven VCB model.
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Comparison of two vacuum circuit breaker arc models for small inductive current switching
Proceedings ISDEIV. 19th International Symposium on Discharges and Electrical Insulation in Vacuum (Cat. No.00CH37041), 2000Co-Authors: Marjan Popov, Lou Van Der SluisAbstract:The goal of this paper is to present two different methods of modelling the reignitions caused by switching of small inductive currents with a vacuum circuit breaker (VCB). Both models are presented for different VCBs which are described by their measured characteristics. For a detailed modelled system, the Overvoltages caused by unloaded transformer switching are calculated and the statistical Overvoltage distribution is estimated.
Xiang Zutao - One of the best experts on this subject based on the ideXlab platform.
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analysis on electromagnetic transient characteristics of uhv half wavelength ac transmission system
Power system technology, 2011Co-Authors: Xiang ZutaoAbstract:The geographical positions of main energy resources in China are far from load centers,and the distances between energy resources and load centers are close to half-wavelength of power frequencey.UHV half-wavelength AC power transmission can be regarded as one of the selectable schemes to send large capacity of electric power via long distance.Based on parameters of UHVAC transmission line in China and refering to the UHVAC transmission system being planned,a model to research UHV half-wavelength AC power transmission is built and by which such problems in half-wavelength power transmission as power frequency Overvoltage,switching Overvoltage,overvotlage caused by grounding faults and seconday arc current are simulated and researched.Based on the results from simulation and research,several measures to suppress these kinds of Overvoltages and seconday arc current are proposed.
Mohsen Tajdinian - One of the best experts on this subject based on the ideXlab platform.
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study of the impact of switching transient Overvoltages on ferroresonance of ccvt in series and shunt compensated power systems
IEEE Transactions on Industrial Informatics, 2020Co-Authors: Mohsen Tajdinian, Mehdi Allahbakhshi, Sandeep Biswal, O P Malik, Donya BehiAbstract:Ferroresonance phenomenon (FP) in a coupling capacitor voltage transformer (CCVT) profoundly deforms the voltage waveform. Transient Overvoltage due to transmission line switching, particularly in series and shunt compensated power systems, is one of the most important issues that increases the exposure level of the CCVT to FP. A probabilistic study focused on the impact of transient Overvoltages on the FP in CCVT is conducted in this article. Through this framework, the behavior of different types of ferroresonance damping circuits (FDCs) is investigated. By investigating the effect of several factors such as switching instance and different fault types in the presence of series and shunt compensation in the power system, the probability density function of the CCVT primary (bus voltage) and secondary (CCVT output) voltage signals with/without different FDCs is obtained. A criterion based on total harmonic distortion, designed to identify and determine the severity of the FP, is also introduced. Simulation results confirm that Overvoltages in a series and shunt compensated power system will enhance the vulnerability of the CCVT against FP.
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probabilistic analysis of switching transients due to vacuum circuit breaker operation on wind turbine step up transformers
Electric Power Systems Research, 2020Co-Authors: Sajjad Ghasemi, Mehdi Allahbakhshi, Behzad Behdani, Mohsen Tajdinian, Marjan PopovAbstract:Vacuum circuit breaker operation causes transient Overvoltages that may lead to severe damages to transformer insulation. Since the parameters affecting these Overvoltages have stochastic nature, a statistical analysis may provide detailed insight into the Overvoltages from the point of view of insulation coordination applications. In this paper, a statistical analysis of the Overvoltage variations of the step-up transformer during vacuum circuit breaker operation is conducted. Some variables, including switching angle, current chopping, high-frequency current quenching capability, and wind turbine power, are assumed as random variables. Besides, some indicators representing the switching Overvoltage characteristics such as the amplitude, the number of restrikes, and the rate of rise are extracted. By performing a probabilistic analysis, the destructiveness due to switching Overvoltages on typical transformer insulation can be investigated. The sensitivity of different surge protective devices and their effectivities are also analyzed and statistically evaluated. The applied methodology is very useful because of the stochastic nature of the switching Overvoltages. In this work, the impact of protective equipment on each of the Overvoltage indicators is analyzed. It is also found that considering only the amplitudes of transient Overvoltages is not enough to draw conclusions about the safety of the transformer when exposed to frequent switching surges.
