Suppression of very fast transients in gas‐insulated substation via terminal and capacitance components—feasibility study

Tavakoli, Ahmad; Gholami, Ahmad; Alamuti, Mohsen Mohammadi

doi:10.1002/etep.620

Cited by 2 publications

(1 citation statement)

References 18 publications

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“…In power supply system, available suppression methods of resonance‐type overvoltage include using ferromagnetic rings and resistors components, power filter measures, phase‐control switch technology, etc. The above protection schemes can also be used to deal with the transient overvoltages generated in the process of HST passing articulated split‐phase region.…”

Section: Integral Transient Process Analysis and Comparisonmentioning

confidence: 99%

Research on electromagnetic transient process in articulated split-phase insulator of high-speed railway considering viaduct's electrical coupling

Wang

Liu

et al. 2017

Int Trans Electr Energ Syst

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Summary In single‐phase alternating current (AC) traction power supply system, to balance 3‐phase load of power system, each phase of electricity is used in rotation. Based on the 7‐section articulated split‐phase insulator of China Beijing‐Tianjin high‐speed railway line, different electromagnetic transient processes are deeply analyzed considering pantograph arc and viaduct's electrical coupling in this paper. First, based on the lumped parameter model, the process of high‐speed train passing the articulated split‐phase region, concluding the upper viaduct part and the lower viaduct part, is deeply studied. Second, through state‐space technique, 4 independent electromagnetic transient processes in articulated split‐phase region of high‐speed railway are derived and analyzed thoroughly considering the impact of pantograph arc and viaduct. Finally, the integral transient process is accurately simulated and analyzed by ATP‐EMTP software under several circumstances, such as different topologies, initial phase and phase difference of feeders, and specific suppression overvoltage measures. The independent and integral comparison results illustrate that the coupled viaduct can lead to the more complex topologies and electromagnetic transient processes. Also, the coupled viaduct can play a significant topology discharge and pantograph overvoltage suppression role for the high‐speed train passing articulated split‐phase region.

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Section: Integral Transient Process Analysis and Comparisonmentioning

confidence: 99%

Research on electromagnetic transient process in articulated split-phase insulator of high-speed railway considering viaduct's electrical coupling

Wang

Liu

et al. 2017

Int Trans Electr Energ Syst

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Simulation of mitigation methods for VFTO' sand VFTC's in Gas Insulated Substations

Reddy¹,

Amarnath

2013

2013 15th International Conference on Advanced Computing Technologies (ICACT)

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Switching operations of circuit breaker, disconnector and fault conditions in a Gas Insulated Substations (GIS) leads to Very Fast Transient Over voltages (VFTO) and Very Fast Transient Currents (VFTC) are developed. These VFTO's and VFTC's leads to generation of Electromagnetic fields in a gas insulated substations. These Electromagnetic fields due to VFTO's and VFTC's leads to greater damages on the insulation of equipments like power transformers, bushings, spacers etc. connected in the GIS system. These transient rise times are in nanoseconds range and the oscillations are in the MHz frequency range. To evaluate the magnitudes at various locations, it is required to perform an accurate analysis on the wave shape and amplitudes of VFTO and VFTC. In this paper the component models of more accurate 420kV GIS station is considered for simulation and analyzed magnitudes at different points in the 420kV GIS, proposed the effective mitigation method to reduce the amplitude of the VFTC and VFTO is presented. Simulations are performed with more accurate modeling of 420kV GIS system model. Electro Magnetic Transient Programming (EMTP) is used to analyse the VFTO's and VFTC's at the different locations in the GIS system. Simulation results are represented for various types of suppression methods considered for analysis.

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Suppression of very fast transients in gas‐insulated substation via terminal and capacitance components—feasibility study

Cited by 2 publications

References 18 publications

Research on electromagnetic transient process in articulated split-phase insulator of high-speed railway considering viaduct's electrical coupling

Research on electromagnetic transient process in articulated split-phase insulator of high-speed railway considering viaduct's electrical coupling

Simulation of mitigation methods for VFTO' sand VFTC's in Gas Insulated Substations

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