Results 151 to 160 of about 3,256 (205)
Some of the next articles are maybe not open access.
Analysis and control of temporary overvoltages for automated restoration planning
IEEE Transactions on Power Delivery, 2002The paper presents a new approach that assists power system restoration planning with regards to control of temporary overvoltages (TOVs) due to transformer energization. The frequency-domain analysis in combination with analytical calculations is applied to find an optimum resonance condition. The analytical equations are based on sensitivity analysis
A. Ketabi, A. M. Ranjbar, R. Feuillet
openaire +1 more source
Effect of Temporary Overvoltages on Transmission Network Equipment
Australian Journal of Electrical and Electronics Engineering, 2009During abnormal conditions of under-frequency load shedding in the Powerlink Queensland high voltage network, it is possible that a temporary overvoltage (TOV) condition of from 1.15 p.u. up to 1.25 p.u. of the nominal voltage of 275 kV could occur. Because this overvoltage exceeds the maximum continuous operating voltage of the network (300 kV), it ...
M. Blundell +3 more
openaire +1 more source
Temporary overvoltages in the Vietnam 500 kV transmission line
ESMO '98 - 1998 IEEE 8th International Conference on Transmission and Distribution Construction, Operation and Live-Line Maintenance Proceedings ESMO '98 Proceedings. ESMO 98 The Power is in Your Hands, 2002This paper investigates temporary overvoltages (TOVs) in Vietnamese 500 kV transmission lines. The accurate modeling of the system components as well as lines, transformers, machines, loads, shunt reactors and surge arresters is presented by taking into account the saturation of transformers and shunt reactors and corona V-I characteristics.
T.T. Quoc +4 more
openaire +1 more source
Study of different techniques to mitigate temporary overvoltage in photovoltaic system
Materials Today: Proceedings, 2022Abstract This paper investigates the cause of temporary overvoltage in PV system and different ways to mitigate them. Temporary overvoltage is an undesired phenomenon in distributed generation system which needs to be eliminated using different transformer configuration and grounding banks.
Ramesh Adireddy +3 more
openaire +1 more source
Temporary overvoltages due to ground faults in MV networks
2009 IEEE Bucharest PowerTech, 2009The paper deals with the temporary overvoltages that build up in radial MV distribution networks following the inception of a 1-phase-to-ground fault (1-Φ -to-Gr). For extended cable/overhead MV distribution networks with ungrounded neutral, in case of low resistance faults at critical stretch of overhead lines, in [1] it has been evidenced that the ...
A. Cerretti +5 more
openaire +2 more sources
A study of temporary overvoltage at HVDC rectifier stations
2011 IEEE Electrical Power and Energy Conference, 2011This paper presents a study of Temporary Overvoltage (TOV) on the Manitoba Hydro rectifier system under the proposed development of a new HVDC link and generations. The TOV assessment is based on a full load rejection of three Bipoles, which should result in the highest temporary fundamental frequency overvoltage.
Chenghong Zhou, Pei Wang
openaire +1 more source
Temporary Detuning of Cablified Transmission Grids for Mitigation of Resonant Overvoltages
IEEE Transactions on Power Delivery, 2022Changes in the power system such as an increased use of cables in transmission systems lead to lower resonance frequencies, a possible consequence being an increased risk for resonant overvoltages. This paper presents a method for protecting the power system from resonant overvoltages caused by transformer energization or fault clearing in the vicinity
Oscar Lennerhag +2 more
openaire +1 more source
Investigation of Temporary Overvoltage on Microgrid with Emphasis on Ferroresonance
International Journal of Engineering Research in Africa, 2018Temporary overvoltages caused by primary and secondary islanding due to a fault on a hybrid microgrid of a wind energy and PV system that was connected to the grid, was considered in this study. Symmetry opening of three poles opening and nuisance opening of circuit breaker leading to ferroresonance were investigated using ATP/EMTP.
Ajibola O. Akinrinde +2 more
openaire +1 more source
Temporary Overvoltage (TOV) Test Values for SPDs in Japan
2018 34th International Conference on Lightning Protection (ICLP), 2018In IEC 61643-11:2011 [1], the temporary overvoltage (TOV) test method and test values to confirm the safety of the SPD in TOV are specified. However, this TOV test values is based on the three phase 4 wire Y connection 230/400V system defined by the IEC 60364series, which are different from the actual situation in Japan.TOV caused by faults in low ...
Kensuke Kaito +2 more
openaire +1 more source
Investigation of transient and temporary overvoltages in a wind farm
2012 IEEE International Conference on Power System Technology (POWERCON), 2012Switching transients in wind farms are initiated by the action of circuit breakers during energization and deenergization events and also during occurrences and clearing of faults. In this paper, an investigation of transient and temporary overvoltages during wind farm switching events have been carried out by considering modeling methodology for all ...
Abhinay Chennamadhavuni +2 more
openaire +1 more source