Recent content by vtb1

I have seen even and odd numbers for both hydro and thermal power plant. So my opinion is there no any logic behind to choose even or odd number of stations.

When we select charger for substation battery, is there nay base to choose voltage level, like 120V or 208V or 240V ? What is an impact by choosing different? when I replace charger, if existing one is working at 208V. Can I install new one with 120V?

I have following data from name plate fo motor operated outdoor disconnect: Type: MO-10 Motor Volt: 48V DC Control Volt: 48V DC Motor HP: 3/4 Motor RPM: 1750 Output torque: 22,000 How can I calculate the locked rotor current from above information? I need to know this current for battery sizing.

I agree with that zogzog, the charger has 130V float dc V. But which term is correct for communication and documentation purpose when refer " Battery "? 125 or 130?

Hi, For 120V dc battery, most of the times we use 125V or 130V. Theoratically, we consider 2V/cell. So for 60Cell, it will be 120V. What is the reason to populate the term 125 or 130V? Which one is correct?

jghrist, Here is whatever makeme confused. " C&D make DCU-9 Lead Calcium cell has 110 in.-lb installtion torque and 100 in.-lb of inspection re-torque."

Hi all, Anyone knows what is "installtion torque" and "inspection re-torque" for that substation battery system? And what's their requirement to know for substation battery?

What is the base to choose frequency and voltage? Geographically, USA region has 60Hz, Asian country has 50Hz. In USA, 1-ph has 110V, 3-ph: 230V. In India, 1-ph:230V, 3-Ph:440V, In Germany: 3-ph:400V.

I am filling a specification sheet for 1-phase step voltahe regulator. I have my kVA rating is 333kVA. voltage is 13.8kV. How can I find impedance @333kVA? Is it necessary to know about transformer data that tis regulator in conjustion with?

I am looking for vendors for Bushing Box, if anyboy know here. I am going to use the bushing box to make connection between trasnformer low side bushing to existing overhead bus. The distance between overhead bus duct end and transformer low bushing is only 8 feet, also both are at differnet...

I have transformer with 115/13.8kV, 24/32/40 MVA, %Z=13.2. How can I find bus ampacity? Is it necessary to consider 150% overload capacity?

What parameters and requirements I should check to select dual ration or multi ratio CT?

How can I choose station service transformer is adequate for particular transformer? I kanow major load on st. service from Power transformer fan load.

How can I calculate kVA/MVA rating of medium votage metal clad breaker? What does kVA rating for breaker mean?

I am looking for guidance for sizing battery for low profile substation. What are the worst case scenario I should cosidere for momentary load ? What breakers or circuit switchers shoyuld be operated in case of fault ?