Time and frequency characteristics of very fast transient overvoltage in ultra high voltage substation

2017 ◽  
Vol 24 (4) ◽  
pp. 2459-2468 ◽  
Author(s):  
Guo-Ming Ma ◽  
Cheng-Rong Li ◽  
Xiong Li ◽  
Hong-Yang Zhou ◽  
Wei-Jiang Chen ◽  
...  
Keyword(s):  
High Voltage ◽  
Frequency Characteristics ◽  
Fast Transient ◽  
Transient Overvoltage ◽  
Ultra High Voltage

3-MV compact very fast transient overvoltage generator for testing ultra-high-voltage gas-insulated switchgear

2014 ◽  
Vol 30 (6) ◽  
pp. 26-33 ◽  
Author(s):  
Tao Wen ◽  
Qiaogen Zhang ◽  
Can Guo ◽  
Xuandong Liu ◽  
Lei Pang ◽  
...  
Keyword(s):  
High Voltage ◽  
Gas Insulated Switchgear ◽  
Fast Transient ◽  
Transient Overvoltage ◽  
Ultra High Voltage

scholarly journals Frequency characteristics of East China Power Grid after bipolar locking of ultra-high voltage direct current (UHVDC)

2017 ◽  
Vol 2017 (13) ◽  
pp. 1237-1241
Author(s):  
Xuelian WU ◽  
Qiang LAN ◽  
Zhaowei LI ◽  
Kanqin ZHUANG ◽  
Yuancheng MIAO ◽  
...  
Keyword(s):  
High Voltage ◽  
Direct Current ◽  
Power Grid ◽  
Frequency Characteristics ◽  
East China ◽  
High Voltage Direct Current ◽  
Ultra High Voltage

scholarly journals Nanocrystalline based Mitigation Technique for Very Fast Transient over Voltages in Gas Insulated Substations

2021 ◽  
Vol 12 (2) ◽  
pp. 1025-1039
Author(s):  
R.Durga Rao, Et. al.
Keyword(s):  
High Voltage ◽  
High Frequency ◽  
Dielectric Strength ◽  
Very High Frequency ◽  
High Frequency Oscillations ◽  
Voltage Transients ◽  
Fast Transient ◽  
Very High ◽  
Mitigation Technique ◽  
Ultra High Voltage

: in gas insulated substations, issue of very fast transient over voltages is very familiar problem because of its effects on live ultra-high voltage equipment. During switching events of disconnectors and circuit breakers prestrikes and restrikes occur due to which voltage transients propagate through gas insulated switchgear. Reflection retraction of these transients increases voltage magnitude and generates very high frequency oscillations. Mitigation or suppression of these voltage transients is important to protect equipment and their dielectric strength and insulation. Due to very high frequency stress, they wield on the apparatus and their magnitude (up to 3.5pu), they create an important problem in the design of ultra-high voltage Gas Insulated Substations. In this paper nanocrystalline based mitigation technique for VFTOs is presented. Nanocrystalline rings can be placed around inner conductor of GIS switchgear. This method of mitigation technique is investigated with four ultra-high voltage substations simulation test setup. Simulation results are presented in MATLAB/SIMULINK

scholarly journals Modeling of 420 kV GIS Substation and Research on Very Fast Transient Overvoltage (VFTO)

2013 ◽  
Vol 5 (8) ◽  
pp. 2656-2660 ◽  
Author(s):  
Seyed Mohammad Hassan Hosseini ◽  
Zahra Bagheri ◽  
Sajede Darvishi-Niafenderi
Keyword(s):  
Fast Transient ◽  
Transient Overvoltage
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