Fault with delta (ungrounded) Source and Wye Grounded transformer
Aug 18, 2001 · Hello all, We do have a 12 kV delta ungrounded source transformer feeding a station service transformer Wye/grounded via an underground 15kV cable rated for with 133% Insulation …
Delta side current for a delta wye grounded transformer with faulty …
Mar 6, 2020 · The wye-side ground fault shows up as a phase-phase fault on the delta-side. The ground fault has positive, negative, and zero sequence components. The zero sequence doesn't make it out …
Detecting Wye Side Faults Through a Delta (on a Delta-WyeGnd …
Jul 21, 2015 · I have a 2500kVA 13.8kV delta - 480Y/277 WyeGnd service transformer that serves a building. The owner is putting 2MW of PV in a field beside the building, which will be connected at …
Wye Wye Transformer connection Pros and Cons | Eng-Tips
Sep 14, 2006 · Wye-Wye transformer connections should generally be avoided because of the objectionable characteristcis of such connections. First, a connection of this type generally requires …
Delta Wye Transfomrer Grounding | Eng-Tips
Aug 13, 2009 · A standard delta-wye transformer will work perfectly fine and will be much easier to find." Dave, where I can find some documentation for this type of connection and calculation of size of …
Why utilities use Wye-Wye Conneted transformer?? | Eng-Tips
Mar 1, 2004 · If there is upstream relaying on a delta-wye transformer, any zero-sequence current can be assumed to be from a primary ground fault, allowing very sensitive ground fault protection. On a …
Ground faults on the secondary of transformer as seen by the primary ...
Feb 9, 2012 · Hi, I have a 12.47kV/4.16kV 5MVA delta-wye(10A,10s resistive grounded system) feeding a 5kV switchgear. The NGR is rated for 10A, 10s and I am using SEL-751A protection relays. 1) A …
Neutral Floating from a transformer wye to Delta | Eng-Tips
Mar 6, 2006 · Further more, a condition of the Wye Delta distribution connection is the floating primary neutral. Distribution systems typically don't have the stability of transmission transformers and the …
Auto-transformer vs Wye-Wye-Delta | Eng-Tips
Oct 31, 2018 · Wye-Wye-Delta gives you the option of running your transformer with the primary ungrounded and the secondary grounded. Often done where no phase shift is required yet you need …
Effect of Lost Phase on Ungrounded Wye/Center-Tapped Delta Bank
Sep 28, 2009 · This is a theoretical question. I'm considering a three-phase transformer bank, described as follows: HV Primary - Ungrounded Wye Configuration LV Secondary - Center-tapped, grounded …