2017 12th International Conference on Live Maintenance (ICOLIM), 2017
Following the implementation of the antigalloping devices for the 400 kV o/h lines with 2 subcond... more Following the implementation of the antigalloping devices for the 400 kV o/h lines with 2 subconductors per phase, as explained in our paper presented by the occasion of the ICOLIM 2014 in Budapest, a new antigalloping device of the same torsional damper and detuner pendulum type was created and already implemented on some of the 400 kV with 3 subconductors per phase in Romania, in 2015. The device is characterized by combining the properties of torsional damping with those of detuning, avoiding the energy transfer from the torsion to the vertical motion. The torsional damping leads to a higher critical wind speed at which the galloping instability appears and limits its amplitude, while the detuning characteristic of the device separates the torsional and vertical frequencies. The new device design took the main shape of that used for 2 conductors per phase, the rigid spacers being now triangular and some differences in the dimensions having to be considered. Nine alternatives were...
2014 11th International Conference on Live Maintenance (ICOLIM), 2014
The concept of the damping pendulum as torsional damper and detuner (TDD) was created and reporte... more The concept of the damping pendulum as torsional damper and detuner (TDD) was created and reported in 1993 by its authors led by Prof. Jean-Louis Lilien from University of Liege- Belgium. Several versions were designed, tested and even used in some minor projects, demonstrating their high capacity to solve the risk of the overhead line conductor galloping with usual frequencies in the range 0.4-0.6 Hz. The parameter describing the damping performance is the transfer function with values in the range 1.52.5 in the case of the previous versions. The new version transfer function came to 3.0, the best met value till now. A description of the pendulum parts, tests carried out and the final design are presented. The pendulum can be easy mounted in Iive-line conditions.
The paper makes an analysis of the eighteen 220 and 400 kV overhead electric lines belonging to C... more The paper makes an analysis of the eighteen 220 and 400 kV overhead electric lines belonging to C.N. Transelectrica - Sibiu Branch (TSO) on the basis of a unitary methodology for assessing their technical state and taking into consideration the different types of expertise conducted until now, including the multispectral analysis from the helicopter of seven lines. Performance criteria for
... George Alexandru Florea (M'2001,SM'2002) was born in Bucharest, Romania, on October... more ... George Alexandru Florea (M'2001,SM'2002) was born in Bucharest, Romania, on October, 1, 1947 and received a Dipl. in Electric Power Engineering in 1970 and a Doctor's degree in High Voltage Engineering in 1985, both from University Politehnica Bucharest, Romania. ...
ESMO 2006 - 2006 IEEE 11th International Conference on Transmission & Distribution Construction, Operation and Live-Line Maintenance, 2006
... George Alexandru Florea (M'2001,SM'2002) was born in Bucharest, Romania, on October... more ... George Alexandru Florea (M'2001,SM'2002) was born in Bucharest, Romania, on October, 1, 1947 and received a Dipl. in Electric Power Engineering in 1970 and a Doctor's degree in High Voltage Engineering in 1985, both from University Politehnica Bucharest, Romania. ...
Greenhouse gas emission and climatic changes constitute major problems at an international level.... more Greenhouse gas emission and climatic changes constitute major problems at an international level. That is why it is great importance to increase energy efficiency on large scale. New advanced power analysis platforms and new control algorithms are developed, in order to administrate the electricity consumption. I intended to give a clear image and a better understanding of the airport's power consumption. That is because data analysis is easy to be used for monitoring energy efficiency and elaborating optimization measures to improve power performance. Based on the measurements achieved in real time and control devices, the following characteristic curves have been extracted for the airport lighting systems. A specific lighting system at the airport is quite disturbing, as can be seen from the monitored data at the airport user (lighting system) and the voltage bar general supply (20kV) as well as the power bars of neighboring users.
Greenhouse gas emissions and climate change are currently major international problems. This make... more Greenhouse gas emissions and climate change are currently major international problems. This makes it important to increase energy efficiency. The implementation of energy efficiency improvement measures has reduced energy demand for industrial platforms, so that energy plans designed before these measures are no longer appropriate for current tasks (extensions are not considered at this time). I intended to give a clear image and a better understanding of the factories’ power consumption (the industrial area in question is located near a city). A power plant-specific power system is quite disruptive, as can be seen from the monitored data at the power plant users and from the general power supply voltage bars (110 kV, 20 kV) as well as from the voltage bars of the adjacent users. Based on real-time measurements and monitoring devices, the following characteristic curves have been extracted for local energy systems. That is because data analysis is easy to be used for monitoring ene...
— The growing need for multimedia applications within wireless Local Area Networks (LAN) demands ... more — The growing need for multimedia applications within wireless Local Area Networks (LAN) demands reliable and efficient broadcasting and multicasting transmission of time sensitive data, like audio and video. IEEE 802.11 standard which is the primary technology in wireless LANs was not initially designed to handle this type of data traffic. However, this raises a series of problems mainly related to the lack of an effective feedback mechanism for multicasting and broadcasting transmission. This inherited problem does not allow the standard to take full advantage of the bandwidth offered by its latest amendments. In this paper the expanding use of the CTS-to-Self protection mechanism is proposed in order to improve the performance of an ad-hoc network in a multiple broadcasting environment. The Medium Access Control (MAC) algorithm is appropriately modified and tested under various data traffic conditions. The simulations shows that this expanding use of CTS-to-Self mechanism can imp...
2017 12th International Conference on Live Maintenance (ICOLIM), 2017
Following the implementation of the antigalloping devices for the 400 kV o/h lines with 2 subcond... more Following the implementation of the antigalloping devices for the 400 kV o/h lines with 2 subconductors per phase, as explained in our paper presented by the occasion of the ICOLIM 2014 in Budapest, a new antigalloping device of the same torsional damper and detuner pendulum type was created and already implemented on some of the 400 kV with 3 subconductors per phase in Romania, in 2015. The device is characterized by combining the properties of torsional damping with those of detuning, avoiding the energy transfer from the torsion to the vertical motion. The torsional damping leads to a higher critical wind speed at which the galloping instability appears and limits its amplitude, while the detuning characteristic of the device separates the torsional and vertical frequencies. The new device design took the main shape of that used for 2 conductors per phase, the rigid spacers being now triangular and some differences in the dimensions having to be considered. Nine alternatives were...
2014 11th International Conference on Live Maintenance (ICOLIM), 2014
The concept of the damping pendulum as torsional damper and detuner (TDD) was created and reporte... more The concept of the damping pendulum as torsional damper and detuner (TDD) was created and reported in 1993 by its authors led by Prof. Jean-Louis Lilien from University of Liege- Belgium. Several versions were designed, tested and even used in some minor projects, demonstrating their high capacity to solve the risk of the overhead line conductor galloping with usual frequencies in the range 0.4-0.6 Hz. The parameter describing the damping performance is the transfer function with values in the range 1.52.5 in the case of the previous versions. The new version transfer function came to 3.0, the best met value till now. A description of the pendulum parts, tests carried out and the final design are presented. The pendulum can be easy mounted in Iive-line conditions.
The paper makes an analysis of the eighteen 220 and 400 kV overhead electric lines belonging to C... more The paper makes an analysis of the eighteen 220 and 400 kV overhead electric lines belonging to C.N. Transelectrica - Sibiu Branch (TSO) on the basis of a unitary methodology for assessing their technical state and taking into consideration the different types of expertise conducted until now, including the multispectral analysis from the helicopter of seven lines. Performance criteria for
... George Alexandru Florea (M'2001,SM'2002) was born in Bucharest, Romania, on October... more ... George Alexandru Florea (M'2001,SM'2002) was born in Bucharest, Romania, on October, 1, 1947 and received a Dipl. in Electric Power Engineering in 1970 and a Doctor's degree in High Voltage Engineering in 1985, both from University Politehnica Bucharest, Romania. ...
ESMO 2006 - 2006 IEEE 11th International Conference on Transmission & Distribution Construction, Operation and Live-Line Maintenance, 2006
... George Alexandru Florea (M'2001,SM'2002) was born in Bucharest, Romania, on October... more ... George Alexandru Florea (M'2001,SM'2002) was born in Bucharest, Romania, on October, 1, 1947 and received a Dipl. in Electric Power Engineering in 1970 and a Doctor's degree in High Voltage Engineering in 1985, both from University Politehnica Bucharest, Romania. ...
Greenhouse gas emission and climatic changes constitute major problems at an international level.... more Greenhouse gas emission and climatic changes constitute major problems at an international level. That is why it is great importance to increase energy efficiency on large scale. New advanced power analysis platforms and new control algorithms are developed, in order to administrate the electricity consumption. I intended to give a clear image and a better understanding of the airport's power consumption. That is because data analysis is easy to be used for monitoring energy efficiency and elaborating optimization measures to improve power performance. Based on the measurements achieved in real time and control devices, the following characteristic curves have been extracted for the airport lighting systems. A specific lighting system at the airport is quite disturbing, as can be seen from the monitored data at the airport user (lighting system) and the voltage bar general supply (20kV) as well as the power bars of neighboring users.
Greenhouse gas emissions and climate change are currently major international problems. This make... more Greenhouse gas emissions and climate change are currently major international problems. This makes it important to increase energy efficiency. The implementation of energy efficiency improvement measures has reduced energy demand for industrial platforms, so that energy plans designed before these measures are no longer appropriate for current tasks (extensions are not considered at this time). I intended to give a clear image and a better understanding of the factories’ power consumption (the industrial area in question is located near a city). A power plant-specific power system is quite disruptive, as can be seen from the monitored data at the power plant users and from the general power supply voltage bars (110 kV, 20 kV) as well as from the voltage bars of the adjacent users. Based on real-time measurements and monitoring devices, the following characteristic curves have been extracted for local energy systems. That is because data analysis is easy to be used for monitoring ene...
— The growing need for multimedia applications within wireless Local Area Networks (LAN) demands ... more — The growing need for multimedia applications within wireless Local Area Networks (LAN) demands reliable and efficient broadcasting and multicasting transmission of time sensitive data, like audio and video. IEEE 802.11 standard which is the primary technology in wireless LANs was not initially designed to handle this type of data traffic. However, this raises a series of problems mainly related to the lack of an effective feedback mechanism for multicasting and broadcasting transmission. This inherited problem does not allow the standard to take full advantage of the bandwidth offered by its latest amendments. In this paper the expanding use of the CTS-to-Self protection mechanism is proposed in order to improve the performance of an ad-hoc network in a multiple broadcasting environment. The Medium Access Control (MAC) algorithm is appropriately modified and tested under various data traffic conditions. The simulations shows that this expanding use of CTS-to-Self mechanism can imp...
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