What are the main benefits between DELTA and WYE systems...?
What are the main benefits between DELTA and WYE systems...?
(OP)
What are the main benefits between DELTA and WYE systems...?
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What are the main benefits between DELTA and WYE systems...?
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RE: What are the main benefits between DELTA and WYE systems...?
Usually, design specs call for wye or delta.
Wye will provide a neutral, and delta won't.
Wye winding insulation can be rated lower tahn delta winding insulatuon for the same applied voltage.
RE: What are the main benefits between DELTA and WYE systems...?
As you've mentioned, I like to know the benefits to mfg. of equipment, end-user of equipment, Utilit company. Also, you mentioned that no Neutral line for Delta, then what about the center tap from Delta to get 120V (line to center)...?
thanks
RE: What are the main benefits between DELTA and WYE systems...?
Delta does not send any power through a neutral no matter what the load imbalance is between the legs. That requires a wye circuit.
Much of the electrical noise found on telephone lines etc. comes from the current flowing through neutral from wye circuits. I have seen this voltage as high as 110 volts between neighborhoods. Since telephone pairs are insulated at the customer end but referenced to ground at the central office, this results in 110 volts common mode to ground! In one case I worked with, a telephone worker was killed when the voltage to ground was 180 volts because of neutral voltage drop.
When a neutral carrying high currents is cut, the result is often fires and occasionally deaths. When an unbalanced wye feed has its neutral back to the source, or between legs, cut, the underloaded leg
will go overvoltage and the overloaded legwill go undervoltage. Either case will destroy equipment. From a safety standpoint, 3 phase delta is safer and cheaper to deliver than 3 phase wye but we do not live in a three phase world. We have both 3 phase and single phase thus we have wye circuits to deliver the single phase power.RE: What are the main benefits between DELTA and WYE systems...?
One reference is Franklin & Franklin, J&P Transformer Book, Butterworths. Tradesoffs are numerous, and out of the scope of this forum to detail. Some self-study will be necessary.
RE: What are the main benefits between DELTA and WYE systems...?
thanks again to everyone.
RE: What are the main benefits between DELTA and WYE systems...?
RE: What are the main benefits between DELTA and WYE systems...?
Is this common to use a large capacity (50 to 60 MVA) step down transformer with on load automatic voltage regulator (+/-)15% for the auxiliaries of a power plant instead of simple on load tap changer?
What is the impact on cost, if such transformer is used?
An expert advised is requested please.
mta0303
RE: What are the main benefits between DELTA and WYE systems...?
If transformers: at least one winding of most transformers is usually specified as delta to trap zero-sequence currents, including 3rd-harmonic currents. The zero-sequence currents end up circulating within the transformer (hence the name "circulating currents") rather than being imposed on the primary transformer supply.