LA's for Delta Xfmr
LA's for Delta Xfmr
(OP)
I read somewhere before that LA size for a transformer if its delta with same voltage level would be higher than wye configuration by the factor of 1.73.
in my case I need to specify LAs for a 400 Y/34500V delta transformer on delta side. which feeds a cable and evenually ends up to hydro poles.
I appreciate anyfeed back on this.
Thanks
in my case I need to specify LAs for a 400 Y/34500V delta transformer on delta side. which feeds a cable and evenually ends up to hydro poles.
I appreciate anyfeed back on this.
Thanks






RE: LA's for Delta Xfmr
RE: LA's for Delta Xfmr
RE: LA's for Delta Xfmr
Would this be sufficient for ungrounded Delta side of a transformer?
according to "jghrist" it needs to be atleast 34.5 MCOV!!!
RE: LA's for Delta Xfmr
Since there is a possibility of operating the 34.5 kV system ungrounded even for some duration, then the MCOV of the arresters should be either equal to 34.5 kV or higher. (If there is no possiblity at all then you can use arresters with MCOV = 24.4 kV)
Since there are no arresters with MCOV=34.5 kV or higher for nominal system voltage of 34.5 kV, you should go to the next rating which is
1)Arrester rated voltage = 48 kV
2)MCOV=39 kV
which is normally suitable for a system with nominal system voltage 46 kV. It will be little expensive.
RE: LA's for Delta Xfmr
RE: LA's for Delta Xfmr
http://www-public.tnb.com/util/docs/PC_SA_full.pdf
How can a LA be exposed to line voltage on delta config?
RE: LA's for Delta Xfmr
RE: LA's for Delta Xfmr