Abstract
This study conducts simulation of a 420 kV GIS substation in order to study on Very Fast Transient Overvoltage (VFTO) caused by disconnect or Switches operation. All components and its connected equipment in this GIS substation are modeled in EMTP-RV software. The various disconnect or switch operation conditions are considered and the results are presented. Finally, the effect of trapped charge on VFTO magnitude is discussed.
Highlights
The switching overvoltage is a typical concern in high voltage power systems
Trapped charge: 0.5 pu Trapped charge: 1 pu Simulation of Very Fast Transient Overvoltage (VFTO) for eight different switching conditions of Disconnect or Switch (DS) in GOTVAND 420 kV GIS substation has been done by EMTP-RV
It was observed that the VFTO magnitude at four points is larger than rated switching impulse withstand voltage in 420 kV GIS
Summary
The switching overvoltage is a typical concern in high voltage power systems. VFTO is generated during the switching operation of a Disconnect or Switch (DS), as well as other events likes operation of Circuit Breaker (CB) or Earth Switches (ES) in GIS (Tavakoli et al, 2009). A number of prestrikes or re-strikes occur because of the slow speed of the moving contact of disconnect or switch (Jian et al, 2010; Kumar et al, 2001). These transients are characterized by every short rise time in the range of a few ns and followed by high frequency oscillations in the range of a few hundreds of KH to about a few tens of MH (Chi et al, 2008).
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