Hi Bacon4life,
This is a B2B HVDC converter, classical thyristor based. From what I understand is that there is a required minimum short circuit current from the inverter/converter connected AC network during the fault, so that even during fault event, the HVDC would still function and...
Hi Itsmoked,
Thank you for your response to the subject. The definition that I received for extreme minimum short circuit current is the fault current resulted in the loss of 2 elements in the system -- N-2 conditions (N-2 would be either the losses of 2 lines, 2 generators, or combination of...
Hi,
I'm not too familiar with HVDC cable operating characteristic so any help would be appreciated. I was asked recently to determine the extreme minimum short-circuit required for the operations of the future installed HVDC line. From what I have been reading the last 2 days is that this...
A field person asked me this question and I couldn't find the document to justify, so we need your help. Given a 3-phase transmission line with length (L)and all three phases are shorted, what is the 3-phase voltage need to apply in the other end to achieve an "X" Amp Line-Ground Current for...
One more question. What is the difference between the above Delta-Wye conversion and that of the typical formula: Z_H = (Z_H-L * Z_H-T)/ Z_sum, where Z_sum = Z_H-L + Z_H-T + Z_L-T ? I'm trying to facilitate the equations above with full representation of Z = R + jX and compare with the one...
Hi,
I'm trying to determine the appropriate way to represent 3-winding Delta transformer to its equivalent Wye representation. The given data were: Primary : Secondary voltages, its MVA rating, MW loss, and %Z. I saw an old note in the past which indicates the calculated resistance as %R =...
Hi,
I'm trying to solve a loadflow case in PSSE and kept getting the problem of PARS operate outside its constrained boundaries. Need some help with under what condition does a phase angle regulator would fail to operate, and how may I be able to mitigate?
Sorry for the confusion. I'm new with PSS/E and looking for a general procedure/strategy in solving blown up case only. I'm sure some of you are well acquainted with the software and would have had experiences in dealing with these difficult cases. What to look for when the case blown up, and...
Hi all,
Any advices in solving blown up case in PSSE? I have been burdened with a very difficult studied case and can't get it solve. Any strategy would be appreciated. Thanks.
hold6448,
I have been looking for the 1996 blackout report for quite some time, but can't get a hold of it. Can you tell me where I may be able to obtain this report? Thanks.
I have heard quite a bit about series reactors on high voltage line were intentionally use to mitigate potential high fault current, but inadvertently, block (absorbs) excessive VARs in the system. How does this actually work? and by what magnitude (proportionally) to the impedance value of the...
Is there an equation which would explain the reactive power absorption of a series reactor with impedance X. Assume that the series reactor between point 1 and point 2. Thanks for any help.
