Will it be OK to connect a 5MVA 33/6.6kV Ynd11 Transformer
to a Star connected Motor. Or on other words connecting a
Delta to a Star.
I have another 30MVA 33/11 Dyn11 and would it be practical
to convert it to Dd0 consequently converting the Voltage
Ratio to 33/6.35kV Dd0.
- 1 Answers
- 4604 Views
- I also Faced
- E-Mail Answers
Answer Posted / a.p.nanjappa
yes. what is the capacity of motor?
In your case , grid voltage is 33kv, Yn connected.Hence
power transformer has neutral connection brought
out.Neutral CT is installed to detect the ground faults.
secondary of 5MVA tranformer is 6.6kv,
This is Feeder bus voltage.6.6kv Feeder bus feeds Motor (
star connected). and Feeder bus is not interconnected to
another source. It is independent.This 6.6kv rotates at 30
lagging to primary3kv system.
Motor must be use inverse & instantaneous time
overcurrent and earth fault ( CDG61+cdg12) or equivalent
manufacturer protection
we use delt to star as weelas star 6.6motor.
No problems experienced.
In the othercase to change a 30MVA,33/6.35KV IS
REDESIGN/MANUFATURING. iT IS EXPENSIVE.No use at all and
advantage. You should change 6.6kv sw.gr also.
| Is This Answer Correct ? | 1 Yes | 0 No |
Post New Answer View All Answers
Mention what are the different colors on wires indicates?
what is the meaning of WYE and DELTA in Electric meter?
EXPLAIN THE ESSENTIAL FACTORS WHICH INFLUENCES THE CHOICE OF SITE FOR A HYDRO ELECTRIC POWER PLANT
Explain the fundamental difference between emf (electro motive force) and pd (potential difference) ?
Cb closed condition if there is a tcs fail whether cb will trip or not
What are the types of excitation system?
What will be electrical cost per sqft for IT building (basebuild and fitout)and for residential township?
why we use the 100% and 95% stator earth fault protection for the synchronus generator ?
how to increase or decrease speed in DC shunt motor by DC convertor
If we use 250A MCCB as a incomer in Control panel for a fault level of 50kA for one second ,assuming temperature rise from 85 Deg. to 100 Deg , Then what will be the Aluminium Bus-bar size for 250A MCCB? Explain in detail.
What is K-rated transformer? What is the use of it? What can be the size(pls provide calculation if possible) of K- factor transformer for 550kW,690V motor operating with drive (VFD)?
how many stairs have you climbed while you were coming
hi, could someone help me to find a control design for syncronising panel .
State the factors, for the choice of electrical system for an aero turbine.
What is dc current source? Differentiate between ideal and non ideal current sources?
