Will it be OK to connect a 5MVA 33/6.6kV Ynd11 Transformer to a Star connected

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.

Question Posted / fahri

1 Answers
4635 Views
I also Faced
E-Mail Answers

Will it be OK to connect a 5MVA 33/6.6kV Ynd11 Transformer to a Star connected Motor. Or on other w..

Answer / 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

More Electrical Engineering Interview Questions

what is laser diodes?

0 Answers

State the difference between Three winding transformers and Two winding transformers ? where its used?

8 Answers

difference between circuit breaker and switchgear?

6 Answers L&T,

Can anybody tell me how to calculate(formula) earth flat size(for copper and aluminium).

3 Answers

Some times to change of DOR of a motor, interchange of R & B is not effected and RYB take same current, but interchange of R&Y is effected ie change the DOR. My doubt is what is the problem in motor and how it is happen.

0 Answers

what is ATS?and its function or operation in power system with its layout.

1 Answers DLF,

advantage of motor design on higher power factor . normally motors are designed for .8 power factor. what is advantage of designing at .88 power factor

0 Answers

i have 500 amp inductive load of motors ,,,pleas tell me how can i calculate for capacitor bank for improving my power factor to 99 .....calcullations for capacitor bank,,,,

0 Answers

how we could know that generator running anti clockwise with seeing the rotating direction of prime mover or engine

1 Answers

In wat way the power compensation takes place when a statcom is connected in a transmission line

1 Answers

what are the standard values for resistances(Megger testing) between L&N, L&E and N&E (L=Live,N=Neutral, E=Earth)?

1 Answers

what are the causes for strip heater failure ?

1 Answers

For more Electrical Engineering Interview Questions Click Here