Can PSCAD be used for studying Transient Enclosure

[coordinator]

I am a M.Tech student from Institute of Technology, Banaras Hindu University, Varanasi India. I am working on Gas Insulated Substation (GIS). I have to simulate Transient Enclosure Voltage (TEV) in a GIS bus duct. TEV also known as Transient Ground Potential Rise(TGPR) is generated due Disconnect Switch operations on a GIS bus. IEEE papers available on this topic have used EMTP or ATP(Alternative Transient Programme) for Digital simulation of TGPR in GIS bus duct. I have studied the various transmission line and cable models given in the master library of PSCAD. Sir, I want to know whather PSCAD can be usefull for studying TEV in GIS. Can I get some models for this. The GIS cable or bus duct is a overhead cable with SF6 gas filled between the conductor and enclosure. How to model such a system in PSCAD ?

[YASWANTH_PSE]

Hello,

I understand your problem. I have some knowledge on this VFTO and TEV in GIS. If u can send me that ATP simulation or paper contained simulation to my mail id ([url=mailto:yaswanth.eee@gmail.com]yaswanth.eee@gmail.com[/url]), I will go through once and i can give u some suggestions. If possible u can attach the file here also.Iam using PSCAD for my work.

[Anonymous]

Hi I'm just wondering in your experience with VFT in GIS, did you consider studying overvoltage due to breaking of transformer inrush current in a GIS? If I'm to include the transformer saturation effect in the GIS model, I find that the very small time step required for the simulation willslow down the simulation enormously. Just wondering if you have any experience in that and advice on how to overcome the problem?

Cheers,

Denis

[YASWANTH_PSE]

Hello Denis,

I studied VFTO generated only due to the disconnector switching. Any way the over voltages which are generated in ur case i.e. transformer inrush currents are not as severe as VFTO due to disconnector. If ur modelling the GIS PSCAD and if u have problem of simulation time with small solution time step, then try to avoid other unnecessary output signals and its storage. this can lead to increase in speed of simulation. Instead of directly running the PSCAD run option from simulation toolbar, try to run the simulation from DOS command window especially for these small solution time step problems, it will do the simulation
more fastly.

Regards,
Yaswanth