2017年8月28日 · If you look at the sequence networks for a delta-wye transfomer, the delta side is an open connection and the wye side is a ground source. For a SLG fault, there is a zero sequence voltage profile that develops on the system with the highest magnitude being at the disturbance, in your case an SLG fault, and it decays as you get closer to your ...

2006年9月14日 · Wye-Wye are mostly used by utiltiy companies mainly for two reasons. One is the groundind as inidcated in IEEE green book, that allows them to ground the grid at more points. Also utility grid could have generation on either side of the transformers, so wye-wye provides convenient point of grounding the neutral at source, regardless of which ...

2006年3月3日 · the neutral is floating as the transformer is wye to delta and the panel designed to work with wye. the problem some breakers on the panel does not work correctly as some button and switchs work with 220volt from the panel (the panel are …

2014年6月11日 · Delta wye; not a grounding transformer. A common power transformer configuration. When you look a the currents feeding a delta load or transformer, The current in the A phase line is the vector sum of the currents in a phase and b phase and is not at the same angle as either A phase or B phase load currents.

2005年2月21日 · I 3 paralled Generators to power an Industrial System Wye System. This is a prime power application. The Generators will serve a Transformer that is 480v - 4160v Wye. The plant is mostly motor loads and will likely have some harmonics due to VFDs. I'm wondering if I should go with a Delta at the Primary for a Delta-Wye Transformer or a Wye-Wye.

2008年4月7日 · The wye-delta grounding transformer will have a larger (by √3) VA rating than the zig-zag grounding transformer, so it will probably cost more. Grounding transformers may have different test requirements than distribution transformers - see the standards I reference below.

2008年8月13日 · The current is limited by the impedance of the transformer bank. The broken delta raises the impedance of the delta circuit and limits the maximum current to a low, engineered value. I am confused by your small red lines. I was under the impression that the current from/to the wye/delta xfrmr would reverse on the faulted phase. Bill-----

2007年2月20日 · We have a Generator Delta Wye step-up transformer ( 4160V/27600V) to be connected to the Utility. The 27,600V Utility Side is normally solid grounded system, but not in the rural areas. So it is likely that the 27600V line around the Delta winding side of the transformer see the transient overvoltages during the ground faults.

2010年4月6日 · Question 1: Are auto-transformers the same thing as a wye-wye transformer with a buried tertiary (wye-wye-delta)? No. Although the YY connection is the most simple economical and popular, there are other connections as showing in the table below.

2003年10月1日 · The transformer values are: - S=15 kVA - Vs (Wye side)=208 - Vp (Delta side)=2815V This is a very small transformer compare with the one we will be using in the field by a factor of 100, but it can give us a good understanding of what is going on. Regarding the unload circuit, yes. All the test were carried out with the Delta side unloaded