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Thank you once again davidbeach. I had tried that earlier - running load flow studies. But the LF report only gave me current magnitudes and not the angles. I may have missed something. Anyway, I called SKM and they said I should use +30 degrees for Yd1 vector group connection.

Thanks davidbeach for your response. I will elaborate more on my problem. I am trying to analyze a fault record available from an overcurrent relay connected to the primary side of this transformer. The fault currents on the primary side are as follows: Magnitudes: Ia=Ic and Ib=Ia+Ic Phase...

I am a little confused with how to interpret the transformer phase shift angle value in SKM PTW software. I want to represent a two winding, 3-phase wye-delta transformer in PTW. The details are as follows: Primary: HV, Wye connected Secondary: LV, Delta connected Vector Group: Yd1 (HV voltage...

I work for a utility in Canada. We have a split phase protection provided on a large AC generator. This protection has a current transformer with Shell type core. Please see the attached diagram for details. I wanted to perform a saturation test on this Current Transformer (CT). I know the...

Yes, this Schneider document is really good. In fact this is the document I was referring to in my first post.

Thank you Trosepe for that info.

To add to my earlier note on the types of VT... The third type that I have mentioned is CSA group 3 VT (rated for line-to-line but one terminal must be connected to ground). The voltage factor of 1.9UN, 8Hrs on a group 3 VT is designated as group 3C and CSA approves its use on ungrounded...

Bronzeado, I am in a process of procuring these VTs. I am looking at ABB, SADTEM and GE as my options. I will post the p.u. cost when I get it. By the way, I am considering VT with a voltage factor of 1.9UN, 8hrs. The VT is 7200/120V. So 1.9UN (UN=4157V) will be about 7898V which is roughly 1.2...

Thanks Scottf. I agree with all your comments. I am looking at having only one primary fuse per VT. When I read the term 'bushing' I thought that you meant a VT with those porcelain or epoxy insulators on top (which you get on outdoor VTs). At 6.6kV, indoor VTs have a bolted terminal right on...

Thank you all for your responses. I also felt that line-to-line rated VT should be sufficient, if at all there is a risk of ferroresonance. From your comments (scottf and slavag) it appears to me that this solution is even better than having a dual secondary winding VT. I believe that the point...

I would appreciate opinions from a few other experts too. Thanks!

I work for a utility in Canada. I will first give some background on our network in question… We have 9MVA, 66kV/6.6kV, YND1 transformer. The HV side has a transmission line with the circuit breaker about 100kM away. The breaker probably performs only 3-pole operation. The LV side of this...

Thanks davidbeach for replying to me. Well, I did contact SKM directly. They told me that they include the capacitive reactance of the capacitor bank in positive, negative and zero sequence networks in series. In the software, when I had entered the kVAR rating of the capacitor, I had found...

I am working on a substation design using SKM power tools software (version 6.0). While working with the software, I have noticed that delta connected capacitor banks used for power factor correction give rise to ground fault currents in an ungrounded delta connected system. I had used a...