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akch2002, Engineer
Category: Homework
Satisfied Customers: 3089
Experience:  Home work expert
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# FIGURE 3 shows part of an electrical supply system. Draw the

### Resolved Question:

FIGURE 3 shows part of an electrical supply system. Draw the impedance diagrams reducing to a single impedance. Calculate the fault MVA levels in each unit for a fault on the left 3.3 kV bus with the bussection switch B open and A closed. Use a base MVA of 10 and show the fault MVA levels on a diagram. Comment on the result and suggest a method of improving the system to limit the fault MVA through T1 to approximately 5 × FL current. (It is not necessary to recalculate.)

Submitted: 2 years ago.
Category: Homework
Expert:  akch2002 replied 2 years ago.
I can help you with this problem but price is less. How much bonus can you add?
Further, type of fault is not indicated. It seems that fault levels are to be calculated for 3-phase to ground fault. Further, how much time you can allow this question to be answered. Kindly indicate.
Customer: replied 2 years ago.

Is 30 ok? i do not require a great level of detail, yes the fault is indicated to be on 3.3 kv busbar so by sqrt 3. I have calculated x pu for transfomers and generators, i just lose it when considering what is parrallel and series because of the switch being closed.

kind regards.

Expert:  akch2002 replied 2 years ago.
Thanks for prompt reply. I will try to submit the answer asap.
Expert:  akch2002 replied 2 years ago.
Generator G3 is 1.6MW or 16MW. Kindly clarify.
Expert:  akch2002 replied 2 years ago.

Here are answers in the following link. G3 rating is assumed as 16MW. Enlarge figures for reading.
word file

The fault MVA through T1 IS 116.67MVA. To reduce it to 5* full load current, we will have to introduce impedance in series with T1.

Customer: replied 2 years ago.

Sorry G3 is 1.6 MW

regards.

Expert:  akch2002 replied 2 years ago.
I will recalculate it tomorrow as it is night time here. I hope it will be acceptable to you.
Customer: replied 2 years ago.

Yes this is fine , it is greatly appreciated .

kind regards.

Expert:  akch2002 replied 2 years ago.

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akch2002, Engineer
Category: Homework
Satisfied Customers: 3089
Experience: Home work expert

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