DC control supply V/s AC control supply for power control center (PCC)

If i understand correctly 110VDC is the "control voltage" of panel.

If so, are the coils of contactors / relays in the panel replaceable? Why that would be enough to change the coils with 230VAC ones.

Are there much amount of control equipments other than relays those must be supplied with 110VDC?

Dear Prashanth

You also need to check, if the equipment which are "proposed" to be connected on 230 V AC, require a continuous AC supply. Just think of "what happens if AC supply fails". If your equipment need continuous supply, then a UPS will have to be added, apart from replacing all the coils with AC rated ones.

Next, Chances are that in some of contactors/shunt trip coils etc., you may not be able to mechanically fit AC coils in place of existing DC coils & which cannot be directly operated on AC supply.

All documentation, drawings etc. will have to be revised and maintained accordingly, which is a big work in itself.

Thus if a UPS has to be added along with all these corrections, then the effort is not worth it. Chances are you might end up paying more with all corrections & time investment.

For your requirement of DC systems, you can contact us. We are an ISO9001-2000 certified manufacturer of Battery chargers, DCDB, DC/DC converters, solar power converters, DC regulated power supplies, electroplating rectifiers etc. & have installations in various substations, power plants, refineries, oil platforms, pipelines etc., in India and 12 other countries in Asia & Africa.

Thanks

Ashok Toshniwal, Director - Universal Instruments manufacturing Co. Pvt. Ltd., 268A, 4th Phase, Peenya Industrial area, Bangalore - 5600058, India.

Ph. 91-80-28396219/28394907/28394289

Fax 91-80-28396583

uni_insta @ dataone.in

Dear Ashok,

Thank you for the reply. You are the only person, who has understood the querry correctly and replied most appropriately. I will discuss this with my colleagues and senior management.

Regards

Prashanth

Pune, India

Dear Prashanth

Thanks for the acknowledment. I look forward to your reply. For Info, we have quite a few installations in & around Pune including Whirlpool, MICO, Wipro, Uttam Galva, HPCL pumping stations, few Hotels etc.

Thanks and regards

Ashok Toshniwal, Bangalore, India.

Your question is not clear...

01. When u are installating New Xmr then u should installed ACB panel not this control panel.

02. Main LT panel cant be of 230v ac/dc.

03. U cant use any DC panel in AC supply.

04. Why u required control supply in main LT panel ?.

05. Also confirm rating of Xmr / HT panel / Total additional load.

06. Any way we should always try to use same power in panels , means try to use full panel on AC, to avoid any cross connection...

We use both types of controls on our PCCs.

In the case of the AC control voltage, contactors are cheaper and upon loss of ac supply , the auxiliary shutsdown and the feedback to the control system is immediate (pilot lamps extinguish, motor ON feedback contact opens etc).

In the case of the DC , it is a bigger drain on the battery bank especially if it is an exsiting battery bank you are tieing on to.

Secondly , more wiring to introduce ground faults and battery system unreliability.

You continue to get pilot lamps indicating running etc even though the motor has no power.You PCC indicator lamps are on so it is not immediately apparent that you have lost auxiliary power to the PCC.