MV Panel Configuration

Since we can only guess at your location, you should take a look at the local electrical regulations and electrical standards that govern this sort of thing and become vary familiar with their content. They clearly indicate what is and is not allowed.

If you have not got access to them then you must consult a qualified electrical engineer or consultant to get the proper information. Don't guess, and don't trust any answer you may receive here (as different countries and even states have different electrical rules and regulations that you MUST design, build and install to).

Failure to do so may result in property damage, injury and possibly death.

Hear Hear. I gave Jack a GA as we see this type of question quite often. ALWAYS, ALWAYS, check with the local authority having jurisdiction before installing any electrical equipment.

Grae

One main income breaker & 3 outgoing circuit braker for each xmr..

Dear Narayana swamy

Please do clear, Whether you are intresting in taking the O/P of all the three 11KV/440V to a Panel or 11KV to panel. If I/C to panel is transformer secondary (440V) then you can plan for single panel with appropriate protection and Bus coupler with suitable electrical - mechanical interlocks.

Other wise go for seperate panels

Regards

Vinu

Dear Sir,

Thanks to all for your earliest response...

Now we are planing the following configuration for incoming supply....

3 nos of 22KV HT I/C supply for 3 nos of 22KV/433V transformer....

So, suggest me

whether 3 nos LT bus duct can possible to terminate with single medium voltage panel? r 3 individual panels are required?

Thanks & Regards

R.Narayanasamy

Dear Guest,

Your decision should depend on the incoming supply . If all incomings are from the same substation and same capacity it will be better you connect all three transformers to individual feeders with two bus couplers so that normally the transformers work independently and in case of failure of any feeder the bus coupler can be switched on after switching of the faulty incomer.It will be considered if the loading of the transformers are almost uniform .

We had a system where two feeders were from one substation and third feeder from another substation. I this case I designed the two feeders to common bus with outgoing feeders connected equally on either side of bus coupler .The third feeder kept as standby in case of failure of one substation or when load sharing arrangement from the incoming substations were required by the supply agency.The third feeder was connected to the bus in place of feeder two depending on requirement.So take your decision as per your requirement.

Dear Mr.Swamy

1. You should have a RMU with at least Two I/c and One O/G provision
2. Instal a Five panel VCB unit having One I/c and Four O/g ( Incomer to this panel is from RMU out going)
3. Instal Three transformer and feed the HT supply to individual transformer from O/g of the above panel
4. The secendory of the Three Transformer to be taken to the Main LT Panel through the Individual LT Kiosks of the respective transformers
5. The Main LT Panel to be designed as: three individual incomer with Buscouplers(Bus couplers shall have S,I,G protections) having A/M selection with under voltage relays and E-M interlock and required no of out going feeders.

Regards

Vinu

Dear Sir,

In case of three Power transformers there shall be two busbars. One main & Reserve Bus bar. You need one bus coupler and 03 bus sectionizer so that each transformer can be isolated.

In the alternate cae of one bus bar you can three incomer panels with bus coupler/sectionaliser in between the transformer. That is 02 nos. of Bus coupler/sectionaliser.

If you have any query please revert.

Best Regards,

N.Suresh

Please prepare the SLD and decide the electrical system.

After freezing the SLD only then construction of panels can be decided.