Results 171 to 180 of about 452 (193)

Analyzing the model of transformer windings under very fast transient overvoltage

2018 IEEE International Symposium on Electromagnetic Compatibility and 2018 IEEE Asia-Pacific Symposium on Electromagnetic Compatibility (EMC/APEMC), 2018
The Very Fast Transient Overvoltage (VFTO) can produce electromagnetic interference and influence the secondary equipment greatly in conventional substation. To analyze the influence of VFTO in secondary equipment in transformers, this article introduces the multconductor transmission lines model (MTL) and derives the transfer function of parallel ...
Shiming Liu, Chuanshun Fu, Ying Zang, Shunqin Zhang, Shuai Li, Qiyan Huang   +5 more
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Measurement of very fast transient overvoltages (VFTO) in a GIS module

11th International Symposium on High-Voltage Engineering (ISH 99), 1999
Gas insulated substations (GIS) have found a wide range of acceptance in power system for their compactness, high reliability and freedom from periodic maintenance (large mean time between failures). This paper deals with the design and development of a capacitive voltage divider for measuring VFTO, as encountered in GIS.
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Statistical assessment of very fast transient overvoltages in gas insulated substations

2000 Power Engineering Society Summer Meeting (Cat. No.00CH37134), 2002
Summary form only given. VFT in GIS can be divided into internal and external. Internal transients can produce overvoltages between the inner conductor and the enclosure, external transients can cause stress on secondary and adjacent equipment. The magnitude of internal transients is in the range of 1.5 to 2 per unit of the line-to-neutral voltage ...
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Investigation of Very Fast-Front Transient Overvoltages for Selection and Placement of Surge Arresters

2018 Power Systems Computation Conference (PSCC), 2018
An analysis of very fast front transient overvoltages, generated as a result of induced effects of lightning, across a photovoltaic plant is investigated. The EMTP-RV version 3.3 computer software platform is used to simulate surge voltage magnification.
R. Oliveirs, P. Bokoro, W. Doorsamy
openaire   +1 more source

Study of very fast transient overvoltages and mitigation techniques of a gas insulated substation

2015 International Conference on Circuits, Power and Computing Technologies [ICCPCT-2015], 2015
The very fast transient overvoltages (VFTOs) generated due to switching operations of gas insulated substations (GIS) are dangerous to the equipments connected to the substations. In special cases these transients may cross the Basic Insulation Level (BIL) of the GIS.
Pathak, Nikhil, Bhatti, T. S., Ibraheem
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Measuring techniques and characteristics of fast and very fast transient overvoltages in substations and converter stations

2021
This Technical Brochure 836 (CIGRE WG C4.45) presents 6 transient measuring techniques in their working principles, key technical features as well as advantages and disadvantages. A series of performance requirements as well as their testing methods for the transient measuring system are specified.
Xie, S., Kocis, L., Okabe, S., Gong, Y., Kang, P., Zhuang, C., Wang, F., Yang, M., Inami, K., Issouribehere, F., Sarcinelli Cruz, G., Filipović-Grčić, Božidar, Han, X:, Nilsson, S., Arinos Teixeira Junior, J., Rothstein, O. J., Tannemaat, I., Gehrmann, G., Liu, Y., Mu, Z.   +19 more
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GIS very fast transients overvoltage testing using electric field measurements

Integrated Ferroelectrics, 2017
ABSTRACTThe Insulated problem, which is caused by very fast transients overvoltage (VFTO) associated with the switch operation of GIS (Gas Insulated Substations), is becoming increasingly serious. According to the linear relationship between electric field intensity and the voltage of the circuit, in this paper describes a method for measurement of ...
Chunguang Suo, Xueqin Xu, Wenbin Zhang, Jinbin Gui, Xiangyu Tan, Tianwen Li   +5 more
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New Methods of Damping Very Fast Transient Overvoltages in Gas-Insulated Switchgear

IEEE Transactions on Power Delivery, 2014
Very fast transient overvoltages (VFTO) are a well-known phenomenon in gas-insulated switchgear. They are mainly generated due to several pre- or restrikes during disconnector switching operations. Since VFTOs may cause complications in substations, a reliable method for damping these transient voltages is of great interest, especially in ultra-high ...
Simon Burow, Ueli Straumann, Wolfgang Kohler, Stefan Tenbohlen   +3 more
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Testing Technology on Very Fast Transient Overvoltage in 500kV HGIS Intelligent Substation

, 2012
Yan Hao, Sun You-Qun, Liu He, Zhao Chun-Ming, Lie Jian-Ping, Zhang Yi-Yun   +5 more
exaly   +2 more sources

Numerical Simulation Calculation Analysis of Very Fast Transient Overvoltage Arcing

2021 IEEE 2nd China International Youth Conference on Electrical Engineering (CIYCEE), 2021
Lei Zhao, Ruming Feng, Chuanqiang Che, Tianyu Liu, Jiali Chong, Huijun Wang, Jun Zhao   +6 more
openaire   +1 more source