Present paper studies the current harmonic spectrum generated by functioning of an electrothermal... more Present paper studies the current harmonic spectrum generated by functioning of an electrothermal installation with electromagnetic induction. In order to analyze the electrical parameters that characterize the electrothermal installation functioning, measurement sets were accomplished using two methods. The first method consists in using a power and energy quality analyzer and the second method uses an acquisition system that contains an adapting interface and a data acquisition board connected to a computer. Paper contains also a simulation of the electrothermal installation functioning realized in PSCAD-EMTDC. Key-Words: nonlinear load, harmonic analysis, LabVIEW, PSCAD-EMTDC.
This paper addresses one of the current areas of interest in electrical engineering, which is con... more This paper addresses one of the current areas of interest in electrical engineering, which is controlled switching of high voltage circuit breakers. During their operation, the problem of controlled switching of high voltage circuit breakers in commutation regimes was studied. Several types of switching were analyzed, considered representative of the transient regime, depending on the type of load, on the defect that may occur on the power supply lines, as well as depending on the position of this defect (near or far). The study carried out in the paper includes simulations of the controlled connection/disconnection operations in a transient regime, assuming the existence of different kinds of defects. To perform the study and simulations in the transient regime, a model, implemented in Matlab, was used for a time interval located around the origin of the time axis. The study included the dependence of the SF6 circuit breaker switching process on the following parameters: the DC vol...
A transient regime appears in the electrical power supply systems, when the power supply status c... more A transient regime appears in the electrical power supply systems, when the power supply status changes from one state to another. This may occur if an electrical discharge causes the lightning to touch the ground in the vicinity of a high-voltage transmission line or when the lightning strikes the station directly. Most transient regimes occurring in the electrical power supply systems are the result of a switching action. Network breakers from different nodes of the electrical power supply network are interrupting high currents and create short-circuit currents which are flowing into the faulty parts of the system. The time period in which the voltages and currents transients are produced is in the range of microseconds to milliseconds. This paper proposes a software program that command the current interruption of the circuit breaker in order to occur at zero crossing current in a time interval of microseconds.
... 6. [6] Peter D. Wendt, Edward J. Coyle, Neal C. Gallagher, Stack Filters, IEEE Transactions o... more ... 6. [6] Peter D. Wendt, Edward J. Coyle, Neal C. Gallagher, Stack Filters, IEEE Transactions on Acoustics, Speech and Signal Processing, vol ASSP 34, No. 4, August 1986, 898-911. ... Collaborative Colleagues: Caius Panoiu: colleagues. Manuela Panoiu: colleagues. ...
Present paper studies the current harmonic spectrum generated by functioning of an electrothermal... more Present paper studies the current harmonic spectrum generated by functioning of an electrothermal installation with electromagnetic induction. In order to analyze the electrical parameters that characterize the electrothermal installation functioning, measurement sets were accomplished using two methods. The first method consists in using a power and energy quality analyzer and the second method uses an acquisition system that contains an adapting interface and a data acquisition board connected to a computer. Paper contains also a simulation of the electrothermal installation functioning realized in PSCAD-EMTDC. Key-Words: nonlinear load, harmonic analysis, LabVIEW, PSCAD-EMTDC.
This paper addresses one of the current areas of interest in electrical engineering, which is con... more This paper addresses one of the current areas of interest in electrical engineering, which is controlled switching of high voltage circuit breakers. During their operation, the problem of controlled switching of high voltage circuit breakers in commutation regimes was studied. Several types of switching were analyzed, considered representative of the transient regime, depending on the type of load, on the defect that may occur on the power supply lines, as well as depending on the position of this defect (near or far). The study carried out in the paper includes simulations of the controlled connection/disconnection operations in a transient regime, assuming the existence of different kinds of defects. To perform the study and simulations in the transient regime, a model, implemented in Matlab, was used for a time interval located around the origin of the time axis. The study included the dependence of the SF6 circuit breaker switching process on the following parameters: the DC vol...
A transient regime appears in the electrical power supply systems, when the power supply status c... more A transient regime appears in the electrical power supply systems, when the power supply status changes from one state to another. This may occur if an electrical discharge causes the lightning to touch the ground in the vicinity of a high-voltage transmission line or when the lightning strikes the station directly. Most transient regimes occurring in the electrical power supply systems are the result of a switching action. Network breakers from different nodes of the electrical power supply network are interrupting high currents and create short-circuit currents which are flowing into the faulty parts of the system. The time period in which the voltages and currents transients are produced is in the range of microseconds to milliseconds. This paper proposes a software program that command the current interruption of the circuit breaker in order to occur at zero crossing current in a time interval of microseconds.
... 6. [6] Peter D. Wendt, Edward J. Coyle, Neal C. Gallagher, Stack Filters, IEEE Transactions o... more ... 6. [6] Peter D. Wendt, Edward J. Coyle, Neal C. Gallagher, Stack Filters, IEEE Transactions on Acoustics, Speech and Signal Processing, vol ASSP 34, No. 4, August 1986, 898-911. ... Collaborative Colleagues: Caius Panoiu: colleagues. Manuela Panoiu: colleagues. ...
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