Results 141 to 150 of about 763 (183)
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Factors affecting transient overvoltages of electric submersible pumps
IEEE Potentials, 2006This article presents a theoretical simulation and analysis of all possible factors due to transient overvoltages (TOVs) that could contribute to electrical failures of electric submersible pump (ESP) motors used in oil fields. A transient calculations software package PSCAD is used to simulate a single cable-fed, 3.3-kV induction motor including the ...
I.A. Metwally, A. Gastli
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Very Fast Transient Overvoltage of UHVAC System
2017Compared with 500 kV EHV GIS substation, 1000 kV UHV GIS/HGIS substation has different characteristics in terms of switchgear, system structure, insulation margin, requirements on safety and stability and importance. And the hazardness of very fast transient overvoltage (VFTO) on UHV GIS is much heavier than that in 500 kV power system.
Yang Li, Guoming Ma, Hao Zhou
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Transient overvoltages in a railway system during braking
2010 IEEE/PES Transmission and Distribution Conference and Exposition: Latin America (T&D-LA), 2010This paper presents an overvoltage analysis in the dc catenary of The Metro de Medellin railway system. The main objective is to study the sources of damages of motors in the trains. It was achieved a detailed study beginning with the direct measurement of variables and then the construction of a digital model in PSCAD-EMTDC.
Mario A. Suarez +2 more
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Very Fast Transient Overvoltage Measurement With Dielectric Window
IEEE Transactions on Power Delivery, 2014The method of using the electrode inserted into gas-insulated switchgear (GIS) to form a capacitor sensor has the best bandwidth to measure the very fast transient overvoltage. However, the power in the GIS conductor has to be cut off during the repair and replacement of the sensor.
Guo-Ming Ma +6 more
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Transient overvoltage in distribution networks in rural areas
2016 33rd International Conference on Lightning Protection (ICLP), 2016A surge sensitivity study of distribution transformers in rural areas of Cundinamarca — Colombia was performed. The analysis took into account the grounding resistance magnitude and the transient overvoltage injection point. Lightning overvoltages are introduced in the IEEE 13 bus system test feeder by using the EMTP-ATP program, results show that ...
Luis Eduardo Perdomo Orjuela +2 more
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Very fast transient overvoltage analysis for 400KV GIS
8th International Conference on Advances in Power System Control, Operation and Management (APSCOM 2009), 2009The very fast transient overvoltage (VFTO) produced during isolator switching operation in EHV GIS substations could impose a potential risk of insulation breakdown in the equipment connected directly to the GIS. A quantitative assessment of the expected VFTO against the VFTO withstand capability of the concerned EHV equipment is necessary for power ...
H.K. Wong, null Shihe Chen
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Transient overvoltages and distance protections: problems and solutions
10th IET International Conference on Developments in Power System Protection (DPSP 2010). Managing the Change, 2010This paper investigates the relationship between post fault transient overvoltages and the functionality of the numerical distance protection. The study is conducted on a 66 kV network with a neutral earth resistor as method to earth the power system.
L. Torelli, S. Moorthy
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Calculation of Very Fast Transient Overvoltages in GIS
2005 IEEE/PES Transmission & Distribution Conference & Exposition: Asia and Pacific, 2005This paper refers to 500 kV gas insulated substation (GIS) of the Tian Huangping pumped storage power station in East China power system. With the current electro-magnetic transient program (EMTP) in world, we simulate and calculate the very fast transient overvoltages (VFTO) caused by operating of disconnect switch (DS), and the factors that ...
Tiechen Lu, Bo Zhang
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Suppression of Transient Overvoltages on Instrumentation Wiring Systems
IEEE Transactions on Industry Applications, 1985Modern electronic analog instrumentation equipment is vulnerable to damage by transient overvoltages appearing on signal and power supply wiring. Experience with overvoltages and relatively simple techniques to avoid damage are discussed.
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Effects of very fast transient overvoltages on transformer
IEE Proceedings - Generation, Transmission and Distribution, 1999An analytical solution is found using the Laplace transform to describe the very fast transient overvoltage (VFTO) in the gas insulated switchgear (GIS) connected directly to a transformer. The oscillation frequencies, and other properties, are explicitly given in terms of system parameters. The magnitude of VFTO at the transformer is suppressed due to
Y. Shibuya, S. Fujita, T. Shimomura
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